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 Last Updated: Thursday September 06, 2012

 

Schematics

   
     
 

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Audio power amplifier schematics

  • Two transistor audio amplifier
     
  • Personal stereo audio amp
     
  • Headphone amplifier
     
  • 1.5W Audio amplifier
     
  • Low-level audio amp
     
  • 10W amplifier
     
  • 80W amplifier
     
  • LM383 12V Amplifier
     
  • 100W Amplifier
     
  • 18W Audio amplifier
     
  • 25W MOSFET amplifier
     
  • Headphone amplifier
     
  • Portable headphone amplifier
     
  • 2W amplifier
     
  • 4W amplifier
     
  • 8 watt audio amp
     
  • 20W Amplifier
     
  • 50W Amplifier
     
  • 100W Audio amplifier
     
  • 100W RMS Amplifier
     
  • 2-Channel Power Amplifier
     
  • Push-Pull Class A Amp using type 5687 dual triodes
     
  • Push-Pull Class A 2A3 Stereo Amp
     
  • Single Ended Class A2 SV811-10 Stereo Amp
     
  • Audio amplifier output relay delay
     
  • Spatial Distortion Reduction Headphone Amp
     
  • HeadBanger Headphone Amp
     
  • 2W Amplifier
     
  • TDA2030 8 Watt amplifier
     
  • Headphone distribution amp
     
  • Headphone monitor amp
     
  • Bi-Directional 2.4 GHz One Watt Amplifier
     
  • Bi-Directional 900Mhz One Watt Amplifier
     
  • 20 Watt GaAaFET Power on 2.3 GHz
     
  • 1 Watt 2.3 GHz RF Amplifier Using a MRF2001
     
  • 2.3 GHz Power Amplifiers
     
  • 2304 and 3456 MHz Power Amplifiers
     
  • High quality exponential VCA
     
  • 16 Watt amplifier
     
  • 8 Watt amplifier
     
  • Power amp schematic (PDF)
     
  • 20 Watt Class-A Power Amplifier
     
  • El-Cheapo - A Really Simple Power Amplifier
     
  • Single Chip 50 Watt / 8 Ohm Power Amplifier
     
  • Hi-Fi Headphone Amplifier
     
  • 100W Guitar Amplifier
     
  • Death of Zen (DoZ) - A New Class-A Power Amp
     
  • Soft-Start Circuit For Power Amps
     
  • Thermo-Fan To Keep Your Amp Cool
     
  • Audio Amp Output Power Limiter
     
  • 55W (Originally 75W) Power Amplifier
     
  • 300W Subwoofer Power Amplifier
     
  • 20 Watt / Channel Stereo Power Amplifier
     
  • Mini bench amplifier (LM386)
     

    Audio preamp circuits

  • Microphone amplifier
     
  • RIAA phono amplifier
     
  • Low impedance microphone amplifier
     
  • Dynamic microphone preamplifier
     
  • Phono preamp
     
  • Masthead preamp
     
  • Preamplifier for microphone or guitar use
     
  • Simple microphone preamplifier
     
  • Tube microphone preamp
     
  • Simple Stereo Electret Microphone Preamplifier
     
  • Simple Stereo Electret Microphone Preamplifier
     
  • Phono Preamp
     
  • Simple microphone preamplifier
     
  • ECM Mic preamp
     
  • Hi Fi preamp
     
  • Balanced microphone preamp
     
  • Audio preamp
     
  • Electret mic amplifier
     
  • Audio preamplifier
     
  • Vacuum Tube Microphone Preamp
     
  • FET Preamp Cable
     
  • Audio preamp
     

    Automative, car and motorcycle schematics

  • Electronic auto stethoscope
     
  • Turn signal alarm
     
  • Motorcycle turn-signal system
     
  • Cigarette lighter 9V adaptor
     
  • Analog Tachometer for Gasoline Engines
     
  • Headlight On reminder with Light
     
  • Adaptive Windscreen Wiper Control
     
  • Car clock
     
  • Car message display
     
  • Car interval wiper
     
  • Safety indicator light
     
  • Speed limit alert
     
  • Grand Cherokee Off-Highway Lights
     
  • Engine control unit schematics
     
  • Portable CD Player Adapter For Car
     
  • Car battery charger
     
  • Wireless Auto Tachometer
     
  • Alternator Signal Detector
     
  • Automotive alarm system
     
  • Road ice alarm
     
  • Automotive Anti-Lock Brake Control Driver
     
  • Headlight reminder
     
  • Breath Alcohol Tester controlling a car ignition system
     
  • Simple car battery charger
     
  • Parking sonar
     
  • Fuel injector pulse width monitor
     
  • BMW R Series Motorcycle Regulator Schematic
     
  • 80188XL Engine Tachometer
     
  • Integrate Fuel Pump Wire Security Cut Off with a Turbo Timer
     
  • Simple Car Preamplifier and Artificial Earth
     
  • FCD (Fuel Cut Defencer)
     
  • Interface between GM's 5 Volt 8192 baud ALDL data stream and a PC serial port
     
  • 5301 wideband fuel mixture display
     
  • Wide Band Fuel Mixture Display
     
  • 3rd brake light
     
  • 12V to 9V car coverter
     
  • Car Nicad charger
     
  • Combination lock for car liftgate
     
  • BMW motorcycle side stand protection mod
     

    Data acquisition and data logging schematics

  • Air flow detector
     
  • Air flow detector
     
  • Strain gauge sensor
     
  • Digital Water Wave/Tide/Level Meter (PIC16F876)
     
  • Self made data-logger V2.5 (second edition)
     
  • Magnetometer
     
  • Analog input section based on AD9220
     
  • uModem 4+4/8 channel A/D board
     
  • ADXL202 accelerometer to CV output
     
  • Light direction sensor
     
  • 12-Bit ADC interface
     
  • Digital thermometer
     
  • Universal flight controllers / datalogger
     
  • Rain detector
     
  • Home Brew Compass Sensor
     
  • Using 555 Timer as an A/D converter
     
  • ADC0804LCN 8-bit A/D converter
     
  • Web-based thermometer project
     
  • Low Flow-Rate Thermal Flowmeter
     
  • Geiger counter
     
  • Differential Capacitance Measurement for Tilt Meter
     
  • Honey Bee counter (PDF)
     
  • Capacitance type liquid level measurement (PDF)
     
  • Thermostat node schematic
     
  • Digital PC Oscilloscope
     
  • Ultrasonic Range & Imager
     
  • Digital compass schematic
     
  • Temperature datalogger
     
  • Serial Port A/D-converter
     
  • Centronics port D/A converters and low-pass filter
     
  • LCD Thermometer
     
  • Wireless Liquid Level Sensing for Restaurant Applications
     
  • Accelerometer Schematic
     
  • Pressure Sensor-Based Altimeter Circuit
     
  • Ultrasonic range finder circuit
     
  • 1-wire barometer
     
  • Water-level sensor
     
  • Addressable ADC
     
  • Electronic altimeter using PIC16F877
     
  • Wireless weater station
     

    Filter schematics

  • Galaxy Noise Filter
     
  • Low-pass active filter
     
  • Filter Circuit for the Earthworm Seismic Data Acquisition System
     
  • Active 2nd Order Filters
     
  • RC Notch Filter (Twin T)
     
  • Multiple Feedback Bandpass Filter
     
  • CW filters
     
  • Self-tune filter
     
  • SSB AF filter
     
  • Helical Resonator Notch Filter
     
  • 3KHz low-pass filter plus audio amp (PDF)
     
  • Active bandpass filters
     
  • Bandpass filters
     
  • Butterworth filters
     
  • Narrow band audio bandpass filter
     
  • Inversal notch and bandpass filter
     
  • DC Accurate, Active RC Lowpass Filter
     
  • Chebyshev Bandpass Filter
     
  • Bandpass filters
     
  • Chebyshev / Butterworth filters
     
  • Biquad Active Bandpass Filter Schematic
     
  • "A" Weighting Filter For Audio Measurements
     
  • Multiple Feedback Bandpass Filter
     
  • Digital signal processor (DSP) for radio communications
     
  • 29.85 MHZ bandpass filter schematic
     
  • 29.85 MHZ notch filter schematic
     
  • LC filter design
     

    Games and fun stuff (schematics)

  • Visor cradle serial interface
     
  • Electronic coin tosser
     
  • Electronic craps game
     
  • First response monitor
     
  • Video ping pong game
     
  • MBC5/CPLD for the GameBoy
     
  • GameBoy Camera Parallel Port Interface
     
  • Mobile robot (PDF)
     
  • PSX controler to PC MIDI converter
     
  • Dreamcast PC serial adapter
     
  • GameBoy Cart Programmer
     
  • Memory game
     
  • 32 Kb x 8 emulator for the GameBoy
     
  • Project: NES to Atari 2600 controller interface
     
  • Battery Meter for Pinball Machines
     
  • SRX1 (Stephane's Robotic eXperiment 1)
     
  • Pine Racecar Victory Judge
     
  • Interfacing Sony control stick to Empeg
     
  • Electronic Nicad glow plug driver
     
  • April Fools LEDs
     
  • Pinewood Derby logic
     
  • Quiz Master
     
  • GameBoy Schematic
     
  • GameBoy LCD schematic
     
  • GameBoy Power & Cartridge schematic
     
  • GameBoy ROM+RAM+MBC1 Cart Schematic
     
  • GameBoy MBC1 circuit equivalent
     
  • Super GameBoy schematic
     
  • Quiz show indicator
     
  • Dreamcast interface
     
  • Bingo!!! (on your tv)
     
  • Slot car TV cronograph
     
  • Furby reverse-engineered circuit
     
  • Sanyo 20EZ monitor Arcade Game (300k ZIP)
     
  • Burger Time Arcade Game (500k ZIP)
     
  • Dig Dug Arcade Game (800k ZIP)
     
  • Frogger Arcade Game (500k ZIP)
     
  • Galaga Arcade Game (542k ZIP)
     
  • Gyrus Arcade Game (800k ZIP)
     
  • Junior Pacman Arcade Game (400k)
     
  • Ladybug Arcade Game (335k ZIP)
     
  • Mappy Arcade Game (470k ZIP)
     
  • Moon Cresta Arcade Game (300k ZIP)
     
  • Mr.Do Arcade Game (554k ZIP)
     
  • PacLand Arcade Game (316k ZIP)
     
  • Pengo Arcade Game (313k ZIP)
     
  • Q*Bert Arcade Game (600k ZIP)
     
  • Qix Arcade Game (476k ZIP)
     
  • Scramble Arcade Game (600k ZIP)
     
  • Time Pilot'84 Arcade Game (870k ZIP)
     
  • Xevious Arcade Game (450k ZIP)
     
  • Magic Wand Conjuring Trick
     
  • Quiz game circuit
     
  • E.S.P. Conjuring Trick
     
  • DIT shutterglasses controller
     
  • Tic-tac-toe game using PIC16F628
     
  • Archery timer
     
  • PIC micro Tetris game
     
  • Magic lamp, IR remote control jammer and other fun circuits (PDF)
     
  • Lego Mindstorms Double Rotation Sensor
     

    Infrared based schematics

  • IR detector
     
  • Infrared body heat detector
     
  • Stereo IR audio receiver
     
  • General purpose IR receiver
     
  • Wireless IR headphone transmitter
     
  • Wireless IR headphone receiver
     
  • Infrared remote control shutter release system
     
  • Infrared transmitter for locomotives
     
  • Infrared gate for door
     
  • Infrared circuits for remote control
     
  • Serial port controller infrared transmitter (PIC16F628)
     
  • IR Receiver (Amplitude Modulated IR)
     
  • IR Transmitter for Audio (Amplitude Modulated IR)
     
  • Digibox interface
     
  • IR remote control
     
  • Long Range Infrared Remote
     
  • iRDA to TTL interface
     
  • 40KHz light receiver (PDF)
     
  • 40KHz TV-VCR repeater (PDF)
     
  • Micro based PIR to IR remote converter
     
  • IR-related ASCII Schematics V1.00
     
  • Infrared remote transponder
     
  • Build an Infrared night scope
     
  • Decoding IR Remote Controls
     
  • IR detector
     
  • PC IR Remote Control Hardware
     
  • PC IR Remote Control
     
  • An Ambient-Light-Ignoring Infrared Active Motion Detector
     
  • Infrared Transmitter and Receiver schematic diagrams
     
  • Pyroelectric Infrared Sensor
     
  • Minimal Infrared transmitter for PC
     
  • Simple IR transmitter circuit
     
  • Simple infra-red detector
     
  • Infra Red Switch
     
  • IR remote control extender
     
  • IR Remote Control Extender Circuit (Mark 2)
     
  • IR Remote Control Extender Circuit (Mark 3)
     
  • IR Link
     
  • IR remote control tester
     
  • 40khz IR Tester
     
  • 555 timer 40khz IR Oscillator
     
  • IR detector / emitter
     
  • Fire-Stick infrared remote control
     
  • Simple infrared remote control
     
  • Infrared / Ultrasonic beacon
     
  • Implementing Infrared Object Detection
     
  • IR detector for robotics
     
  • Computerized Infrared Remote
     

    Laser related power supplies & data transmission

  • Light beam receiver for laser pistols
     
  • 12V supply for He-Ne laser
     
  • Laser diode transmitter
     
  • Laser power supply
     
  • Laser transmitter/receiver
     
  • Laser harp
     
  • Laser Telephone Receiver Circuit
     
  • Fiber Optic Voice Communications
     
  • Efficient Laser Supply
     
  • 20MHz VCSEL 3mW laser test circuit (PDF)
     
  • 10MHz to 20MHz laser light detector (PDF)
     
  • Micro-power 40KHz burst laser diode driver (PDF)
     
  • 40KHz laser burst detector (PDF)
     
  • Modulated laser diode tester (PDF)
     
  • Ar/Kr Ion Laser Power Supply
     
  • Laser diode power supply circuits
     
  • HeNe laser power supply
     
  • OPT201 Laser receiver
     
  • OPT301 Laser receiver
     
  • Laser transmitter schematics
     
  • Diode Laser Power Supplies
     
  • Laser bug circuit
     
  • RS-232 Laser Transceiver
     
  • Experimental laser data link
     
  • Ar/Kr Ion Laser Power Supply Design
     
  • Simple laser communicator
     

    LED related schematics

  • LED Flasher
     
  • LED pulser with audible output
     
  • IR Illuminator
     
  • Flashing Christmas LED display
     
  • ICL7660 LED flasher
     
  • LM3909 replacement using discrete components
     
  • Color fade
     
  • LEDs shimmer randomly as though on fire
     
  • LED power supplies for AA cells
     
  • 1.5 Volt LED Flashers
     
  • AC Line Powered LEDs
     
  • Astable Multivibrator
     
  • 9 Second Digital Readout Timer
     
  • 9 Second LED Relay Timer
     
  • 16 Stage Bi-Directional LED Sequencer, other sequencer and flaser circuits
     
  • 10 Stage LED Sequencer
     
  • 28 LED Clock Timer
     
  • Fading Red Eyes
     
  • Two Transistor LED Flasher
     
  • 16 Stage Bi-Directional LED Sequencer
     
  • Expandable 16 Stage LED Sequencer
     
  • LED Photo Sensor Circuit
     
  • LED chaser
     
  • 7 Segment LED Counter
     
  • 7 by 10 LED Moving Sign ( 27C512 EPROM)
     
  • Sequencial LED Flasher with Reversable Direction
     
  • Tri Color LED Controller with Serial Interface
     
  • 1.5V LED flasher B (PDF)
     
  • Low current LED flasher (PDF)
     
  • 1.5V LED flasher A (PDF)
     
  • Flashing LED advertising badge (PDF)
     
  • Flashing LED advertising badge (PDF)
     
  • Pulsed LED test circuit (PDF)
     
  • Low battery voltage flasher (PDF)
     
  • Adjustable flashing LED
     
  • PWM white LED drivers
     
  • Heart of LEDs
     
  • Christmas Star
     
  • Christmas tree
     
  • LED Counter
     
  • PIC16F84 LED chaser
     
  • PIC16F84 LED signboard
     
  • PIC16F84 LED signboard 2
     
  • White LED circuits
     
  • Assorted LED circuits
     
  • LED Mood Light
     
  • LED Audio VU Meter
     
  • Robot Beacon rotating light using PIC12C508
     
  • LM3909 LED flasher
     
  • Animated LED signboard (PIC16C84)
     
  • Picxie 2 - 8x8 Animated LED Signboard
     

    Lighting schematics

  • Garden light switch
     
  • DMX lighting and special effects
     
  • Microcontroller Multichannel Light Dimmer
     
  • Digital timer light switch
     
  • Hand clap lamp control
     
  • Radio controlled light switch
     
  • Disco style Strobe Light
     
  • Varying Brightness AC Lamp
     
  • 12 Volt Lamp Dimmer
     
  • 120VAC Lamp Chaser Using Solid State Relays
     
  • Flashing Neons (NE-51 / NE-2)
     
  • Sequencing Neons (NE-51 / NE-2)
     
  • Touch Activated Lamp
     
  • 220V Flashing lights
     
  • Coutesy lamp
     
  • Bedside lamp timer
     
  • TRIAC light dimmer
     
  • 12VDC Fluorescent Lamp Driver
     
  • Strobe light
     
  • Adjustable Strobe Light
     
  • RHINO8 EL Sequencer
     
  • Light Sequenced Candelabra
     
  • Light timer
     
  • 5W Fluorescent light intensity modulator (PDF)
     
  • 1W Fluorescent lamp night light (PDF)
     
  • Low-voltage light dimmer
     
  • Light chaser
     
  • 4-channel dimmer rack
     
  • PIC16F873 light controller
     
  • Disco light controller
     
  • Neon desklamp
     
  • Electronic night light
     
  • Neon lamp dimmer
     
  • LED Mood Light
     
  • LX-800 Lighting system
     
  • Xenon Strobe Light
     
  • Lamp flasher/dimmer
     

    Medical and health related schematics

  • Snore alarm electronic device
     
  • Heartbeat transducer
     
  • ECG Amplifier
     
  • EKG/EEG circuit
     
  • Radiation Dosage-Rate Meter
     
  • Heartbeat monitor
     
  • Cranial Electrotherapy Stimulator
     
  • Automated crib lights
     
  • Jogging timer
     
  • Tan timer
     
  • Muscular Bio-stimulator
     
  • Pedometer
     
  • Simple lie detector
     
  • EEG preamp, anti alias filter and isolation circuit
     
  • Self Contained Electromyograph (EMG)
     
  • Cardiac monitor
     
  • Galvanic Skin Response (GSR) Schematic
     
  • Brain-Wave Machine
     
  • Lie detector
     
  • Simple lie detector
     
  • ECG project page
     
  • The ESP SIM (Sound Impairment Monitor)
     
  • Respiration system
     

    Microcontroller based schematics

  • PIC based packet radio encoder (PDF)
     
  • RS485-Version of the SAB80C535-Microcontrollerboard
     
  • PC IR receiver based on PIC16F84
     
  • Record and play fast 1-bit sound on a PIC micro
     
  • AT89C2051/4051scanning 7-segment display and keypad
     
  • AT89C2051/4051 Driving dot LED
     
  • AT89C2051/4051stepper motor interface
     
  • AT89C2051/4051connecting dumb terminal
     
  • Simple RS232C Level Converter using Transistors
     
  • C-52 EVB Robot Controller
     
  • Mains clock controller using AT89C2051
     
  • AT89C2051/4051 Easy-Downloader
     
  • AT89C51/52/55 Easy-Downloader
     
  • PIC16F84 programmer
     
  • PIC16F84 miniature real-time controller
     
  • Isolated RS232 for PIC16F84
     
  • PIC16F84 debugging terminal
     
  • MiniLOGGER V1.0
     
  • Atmel 89C Series Flash Microcontroller Programmer
     
  • AT89C2051 real-time controller
     
  • PIC12C508 Night-light saver
     
  • AT89C2051 Night light saver
     
  • Atmel 8051 Flash Based-Microcontroller Programmer
     
  • AT89C2051 Digital thermometer and clock
     
  • PIC16F84 CW decoder (PDF)
     
  • 12C508 Smart Lock
     
  • 80C31 stepper motor controller
     
  • Build a PIC controlled DDS VFO, 0 to 6 MHz
     
  • PIC controlled DDS VFO, 0 to 6 MHz
     
  • Basic Stamp Lightning Activity Monitor
     
  • PIC16F84 line following robot
     
  • PIC16C505 IR / wireless remote control
     
  • Automatic door opener with PIC12C508
     
  • RS485-like multi-drop bus with half duplex serial protocol
     
  • WWWpic2 - A web server in a PIC
     
  • PIC16F84 web server
     
  • 50 MHz frequency counter, voltage meter & SWR/PWR indicator
     
  • Programmer PIC16F84,12C50x and EEPROM 24Cxx
     
  • RDS Encoder - digital part
     
  • PIC programmer for serial port
     
  • Fully functional PS/2 mouse based on the PIC16F84
     
  • PIC 18 programmer (PIC18F458, PIC18F452, PIC18C252, PIC16C745, PIC18F6620, PIC18F6720)
     
  • Freign vocabulary recollector
     
  • Illuminate holiday destinations on a world map
     
  • Embedded system to send e-mails (small TCP/IP stack)
     
  • Speaking clock using PIC & ISD device
     
  • Speaking doorbell using PIC & ISD device
     
  • Whistle detector using 8-pin PIC
     
  • PIXpand
     
  • PIC16F877 to IDE interface
     
  • 68HC11 stepper motor control
     
  • POCSAG encoder/decoder
     
  • Network Time Protocol AVR Clock
     
  • DS1820 Temperature Sensor Readout Unit
     
  • Rotating Sprocket Wheel Generator (PIC16F84)
     
  • Talking PIC - based on SP0256
     
  • Serial to parallel converter using the AT89C2051
     
  • AT89C2051 serial COMs to LED driver
     
  • PIC16F877 Programmer And Development System
     
  • DS1820 Arbiter V2.00 Schematic
     
  • Microchip PIC ICSP implementation
     
  • 101 AT Keyboard to ASCII Decoder using 68HC705J1A MCU
     
  • LCD Serial Terminal
     
  • Propellor clock (PIC16F84)
     
  • Optical sensor using PIC12C508
     
  • Interfacing S-7800A to PIC16F877
     
  • A Scenix (and PIC) Programmer
     
  • MMC to PIC16F876 circuit diagram
     
  • 8088 maximum mode SBC
     
  • EZ80 single board computer schematic (Z80)
     
  • Voice recording and message retrieval system
     
  • Long-period watchdog timer
     
  • PIC16F84 Range Finder Project
     
  • Generate video signals in real-time using a PIC16F84
     
  • PIC ICD
     
  • PIC Project #1 - RS232 to I2C Interface
     
  • Galvanic decoupling of I2C bus
     
  • Programmer PIC16F84,12C50x and EEPROM 24Cxx
     
  • Dual PIC16C84 prototype board
     
  • Graphic LCD interface
     
  • FSK modem with PIC16C84
     
  • Talking YODA project (PIC16C84)
     
  • PIC16F84/PIC16F87x-In-System-Programmer
     
  • Microcontroller interface for 5KW microwave oven
     
  • Using an I2C Serial EEPROM with a Basic Stamp 2
     
  • PIC16F84 Based Morse Code Reader
     
  • AVR-Based Serial Port IR Receiver
     
  • Interfacing piezo elements to a microcontroller
     
  • Victoria TAFE programmer (based on AT89C2051)
     
  • JDM programmer
     
  • PIC micro programmer
     
  • Speech recognition using HM2007
     
  • PIC microcontroller servo motor interface
     
  • PIC micro multiple servo motor interface
     
  • PIC16F84 countdown timer
     
  • PIC16F873 ultrasonic range meter
     
  • PIC16F873 Digital clock
     
  • PIC16F873 remote display
     
  • PIC16F84 stepper motor controller
     
  • Way small web server
     
  • PICADC - a free, PIC based "intelligent" A/D converter
     
  • PIC-Programmer 2
     
  • Connecting PIC12C508 8 to 93AA46 serial eprom
     
  • KD7LMO Micro Beacon (PIC18F252)
     
  • GPS LCD Display Project
     
  • PIC16F84 LED chaser
     
  • PIC micro LED projects
     
  • AT89C2051 line-follower robot
     
  • Night light saver (PIC12C508)
     
  • Basic stamp interface circuits
     
  • Microcontroller sensor and actuator interfaces
     
  • Giant money counter (PIC16F876)
     
  • PIC12C509 logic gate replacement for nitrogen filler
     
  • PIC demo board
     
  • PIC12C509 Gym Timer
     
  • PIC LCD and Keypad driver
     
  • PIC12C508 Phase Controller for 2kW heater
     
  • PIC16F84 TRIAC / IGBT brightness phase controller
     
  • PIC16F84 pulse monitor with date/time output (ZIP)
     
  • Programmer for the 68HC705C8 MicroController
     
  • 27c801 EPROM Programmer Project
     
  • LCD to PIC16C54 schematic
     
  • 68HC11 based RDS decoder
     
  • Acceleration monitor using ADXL202 and AVR
     
  • 40+ MHz 5-digit frequency counter with an AVR 2313
     
  • Interfacing DRAM to AT90S8515
     
  • Temperature monitor/controller: AVR 2313 / DS1621
     
  • PIC micro to ISA bus interface
     
  • PIC16C84 VT-52 Emulator for Linux
     
  • Microchip PIC ICD (in-circuit debugger)
     
  • Tony Nixons Pocket Programmer (PIC)
     
  • PicoWeb V5.1 (AT90S8515) tiny web server
     
  • 8051 Development System Circuit Board
     
  • 8051 Development System Circuit Board
     
  • Temperature controlled based on AT89CX051
     
  • AFSK 1200 Modem based on PIC16C620
     
  • PicCon - Hidden Radio Transmitter Controller
     
  • PIC16F84 tone generator with source code
     
  • PIC16F84 tone generator
     
  • PIC16F84 tone generator (6-Bit)
     
  • AVR Beacon Super Keyer
     
  • AVR Frequency Counter
     
  • AVR Digital Voltmeter
     
  • AVR Signal Generator
     
  • Ser-Key 10-Key Serial Keypad Encoder
     
  • 2-wire LCD interface using PIC16CF84
     
  • PIC16F84 Serial I/O-expander with PicBasic
     
  • RS 485-RPT Schematic
     
  • Low cost Atmel in-system programmer
     
  • Ultra low-cost programmer for AT90S family
     
  • AVR to USB interface
     
  • Programable LCD counter with memory backup based on Atmel AT90S1200A
     
  • Connecting AT90S2313 with LCD display 2x16 char and 4x4 keypad
     
  • Atmel AVR RCEN fuse bit programmer
     
  • Electronic safety lock based on ATtiny26
     
  • GSM SMS remote control using AVR microcontroller
     
  • 128x64 LCD Driver for AT90S2313 (ZIP file)
     
  • Connecting LED to PIC Micro I/O pins (PDF)
     
  • Microprocessor RS-232 Reset
     
  • AT90S8515 experimenter board
     
  • Multi-chip programmer for PIC microcontrollers
     
  • Buffered PIC chip interface
     
  • A PIC-Based Keyboard Emulator
     
  • PIC-based robot
     
  • ScanMate audio activated recorded
     
  • PIC vacuum fluorescent display interface
     
  • PIC18F252 bootloader schematics
     
  • PIC16F876 Datalogger
     
  • GPS Repeater
     
  • Kodak DC-20 camera interface (PIC12C509)
     
  • Kodak DC-20 camera interface (PIC16F84)
     
  • PIC programmers for parallel port
     
  • Wisp628 ISP Microchip PIC Programmer
     
  • Nixie clock (PIC16F876)
     
  • Zilog Z80 thermostat embedded web server
     
  • Picxie 2 - 8x8 Animated LED Signboard (PIC16F84) Picxie 2 - 8x8 Animated LED Signboard
     
  • 10 tricks for interfacing to the PIC16C508
     
  • Interfacing the PIC16C508
     
  • PIC 5x7 display
     
  • Analog to digital conversion notes
     
  • Multi-chip programmer
     

    Misc audio (also see Music, Amplifiers, Preamp)

  • Electronic siren
     
  • Two-tone siren
     
  • Underwater microphone
     
  • Code practice oscillator
     
  • Noise generator
     
  • Electronic whistle
     
  • Twin-T Audio Sine Wave Oscillator
     
  • 1.5V Audio Amplifier
     
  • Low Power Op-Amp - Audio Amp (Intercom)
     
  • 555 Tone Generator (8 Ohm Speaker)
     
  • 3 Transistor Audio Amp (50 milliwatt)
     
  • Low Frequency Sinewave Generator
     
  • Automatic Charger for Battery Operated Hi-Fi Preamps
     
  • Audio level indicator
     
  • Room noise detector
     
  • Amplifier timer
     
  • Bell ring generator
     
  • Amplified ear
     
  • Precision audio millivoltmeter
     
  • Six-channel Mixer and Amplifier
     
  • Audio Signal Source
     
  • Analog VU meter
     
  • Voltage controlled amplifier
     
  • Audio graphic equaliser
     
  • Intercom preamp
     
  • FET audio mixer
     
  • Microphone mixer
     
  • Tone control
     
  • Digital volume control
     
  • Sound level meter
     
  • CMOS IC audio oscillator
     
  • Three band Active Tone Control
     
  • Automatic gain control (AGC) circuits
     
  • Audio frequency meter
     
  • Bull Horn
     
  • Sound Mixer/Amplifier
     
  • Very loud beeper (PDF)
     
  • Digital noise generator (PDF)
     
  • Tone display system
     
  • Tube amplifier
     
  • Condenser microphone hookup
     
  • Phase shifter
     
  • Paradoxical Sound Syntheizer
     
  • Various tube crossover circuits
     
  • Bias circuits
     
  • Audio line isolator
     
  • Dynamic microphone to electret microphone input
     
  • Line level signal to microphone input adapter
     
  • Simple two line output combiner
     
  • Electret microphone powering circuits
     
  • Use amplifier phono input as line level input
     
  • Speaker signals to line level inputs
     
  • Spring reverb unit
     
  • Sine wave generator
     
  • Simple amplifier
     
  • 3-Band equalizer
     
  • 6-Input mixer
     
  • Doorphone intercom
     
  • Stereo line driver
     
  • Audio notch filer
     
  • Peak reading audio level meter
     
  • Tone control
     
  • Speaker Microphone Circuit
     
  • Electronic canary
     
  • Electronic siren
     
  • Microphone phantom power supply
     
  • Voltage Controlled Mixer w/Modulator
     
  • Dual Voltage Controlled Oscillator w/Modulator
     
  • Dual Voltage Controlled Filter w/Modulator
     
  • Stereo Ducker
     
  • MS Stereo Decoder
     
  • MS Stereo Microphone
     
  • RIAA Equalized Stereo Phono Preamp
     
  • Tube active crossover
     
  • Improved PL tone decoder
     
  • Magnetic cartridge amplifier
     
  • LM358 preamp
     
  • Sound detector
     
  • Tone detector
     
  • Tone generator
     
  • Warbler
     
  • Voltage Controlled Panner
     
  • Low Noise Microphone Preamplifier
     
  • Bridging Adapter For Power Amplifiers
     
  • Simple Surround Sound Decoder
     
  • Simplest Ever Amplifier Bridging
     
  • Stereo Width Controllers
     
  • Power Amplifier Clipping Indicator
     
  • Phono Preamps For All
     
  • Digital Delay Unit For Surround Sound
     
  • Parametric And Sub-Woofer Equaliser
     
  • High Quality Sound Mixer
     
  • Loudspeaker Protection and Muting
     
  • Direct Injection Box for Recording & PA Systems
     
  • Minimalist Discrete Hi-Fi Preamp
     
  • Signal Detecting Auto Power-On Unit
     
  • Load Sensing Automatic Switch
     
  • Amplifier thermal protection
     
  • Active Sub-Woofer and Controller
     
  • Balanced Line Driver & Receiver
     
  • VU And PPM Audio Metering
     
  • Variable Amplifier Impedance
     
  • Linkwitz Cosine Burst Generator
     
  • Low Noise Balanced Microphone Preamp
     
  • Fast Audio Peak Limiter
     
  • Subwoofer Equaliser
     
  • Surround Sound Decoder Mk2
     
  • Audio mixer
     

    Miscellaneous schematics

  • Ultrasonic radar
     
  • Electronic fish lure
     
  • Ultrasonic sound receiver
     
  • Experimental data transmitter for fiber optics
     
  • Experimental fiber optic receiver
     
  • Ion detector
     
  • Darkness monitor
     
  • Electroscope
     
  • Simple event counter
     
  • Geiger counter
     
  • Light detector
     
  • Short-circuit beeper
     
  • LM 1800 FM stereo decoder
     
  • Glitch detector
     
  • MAX924 bar-graph level gauge
     
  • Ultrasonic generator
     
  • Negative ion generator
     
  • ELF Monitor
     
  • Chaos generator
     
  • Simple BFO metal detector
     
  • Voltage Comparator Information And Circuits
     
  • Build Your Own Digital Setting Circles For Your Astronomical Telescope
     
  • PL tone generator (NE567)
     
  • Bat detector
     
  • Bat detector microphone pre-amplifiers
     
  • Full-duplex doorphone with 3 wires connection
     
  • G Strain energy absorber
     
  • RDS Encoder
     
  • Toggle Switch Debounced Pushbutton
     
  • RDS Encoder
     
  • Discrete Set/Reset Flip Flop
     
  • Monostable Flip Flops (one shot)
     
  • Discrete Bistable Flip Flop
     
  • Talking Morse Code Practice Computer
     
  • Plant watering watcher
     
  • Capacitance sensor
     
  • Whistle responder
     
  • Nocturnal animals whisker
     
  • 12V DC electronic door chime
     
  • Biasing Op-Amps into Class A
     
  • Parasite zapper
     
  • Analog computer
     
  • BayComm packet modem
     
  • Morse monitor
     
  • HamComm modem interface
     
  • Morse paddle keyer
     
  • UV light box
     
  • Random noise generator
     
  • Analog pulse counter
     
  • Analog opto-isolator
     
  • Pulse width modulators (PWM)
     
  • Pulse width to voltage converter
     
  • Fantastic Atom Expander
     
  • Black Light
     
  • Computerize Your Room/Home
     
  • Flash slave trigger
     
  • A Visual CW Zero Beating Aid
     
  • A two-way Morse practice set
     
  • Magnetic levitation device
     
  • Tesla power receiver
     
  • Lazer Tag Equipment Modifications
     
  • Garmin GPS data interconnect
     
  • Inexpensive APRS Weather Station
     
  • Walking robot
     
  • Basic op-amp circuits
     
  • Power line FM intercom
     
  • Intercom circuit
     
  • Lightning Storm Detector
     
  • Large LCD Display Buffering Driver
     
  • Text to speech converter
     
  • Ion detector
     
  • 1uS light pulse descriminator plus F to V converter (PDF)
     
  • Broadband 2MHz optical fiber receiver (PDF)
     
  • Modulated light received (PDF)
     
  • 1uS light pulse receiver plus post amp (MISC)
     
  • Broadband 5MHz optical fiber receiver (PDF)
     
  • High-speed light receiver (PDF)
     
  • Basement doorbell beeper (PDF)
     
  • Time to dust indicator (PDF)
     
  • Low-power optical interrupter (PDF)
     
  • Simple nitrogen spark generator (PDF)
     
  • Ultrasonic transducer oscillator circuit
     
  • Build logic gates using discrete parts
     
  • Jacob's Ladder
     
  • Sudden Ionospheric Disturbance (SID) Receiver
     
  • A selection of robotics projects
     
  • Bat detector (new)
     
  • Vat detector (old)
     
  • Variety of quick designs
     
  • Gold wafer (smartcard) programmer
     
  • Making a FRED photopopper
     
  • Griffith Observatory Tesla Coil
     
  • Fogger smoke machine
     
  • Dinsmore 1490 digital compass
     
  • Geiger counter
     
  • Electric field disturbance monitor
     
  • Inexpensive seismometer project
     
  • Digital dial
     
  • GPS receiver interface
     
  • Doorbell for the Deaf
     
  • Electromagnetic field detector
     
  • Insect Repellant
     
  • High Quality Intercom
     
  • Magnetic Gun.
     
  • Metal detector
     
  • Static Electricity / Negative Ion Detector
     
  • Ultrasonic dog whistle
     
  • Popular Electronics Ultrasound Detector
     
  • An Inexpensive X-ray Machine
     
  • Magnetic levitation circuit
     
  • PE3342 Programmer Schematic
     
  • u-Blox GPS receiver board
     
  • Assorted digital circuits
     
  • Basic electronic circuits
     
  • Miscellaneous simple circuits
     
  • Digital Call Sign Annunciator
     
  • Ultrasonic switch
     
  • Sound finding cricket with phase detector
     
  • Sound finding cricket
     
  • APRS GPS tracker schematic (PIC16C73)
     
  • Very basic circuits
     
  • Bat detector
     
  • FCTS Project
     
  • Smooth Tone Clickless CW Sidetone Generator
     
  • Morse Code Beacon Keyer
     
  • Lightning Activated Camera Shutter Trigger
     
  • Simple metal detector electronic circuit
     
  • Three Power Supplies for the Garmin GPS-20 Sensor Board
     
  • Driving N-channel FETs from TTL
     
  • Miniature Self-Powered Autonomous Robot
     
  • Morse Code Practice Keyer 1
     
  • Morse Code Practice Keyer 2
     
  • 741 Light Sensor
     
  • Fluid level detector
     
  • The Aisin-Seiki GPS-Receiver (The "US$20 GPS")
     
  • Morse code display
     
  • Intercom schematic
     
  • Scaling ADXL50 accelerometer output
     

    Model and remote control schematics

  • Snake throat muscle controller
     
  • Handy cricket for robotic applications
     
  • Incline Railway Control Circuit
     
  • A Receive Signal Decoder
     
  • 27Mhz toy car receiver
     
  • 27Mhz toy car transmitter
     
  • One ounce rocket ejection timer
     
  • LED traffic lights
     
  • Two-tone siren
     
  • Proportional radio remote control
     
  • Alf: The Robotic Matchbox car
     
  • Seaplane schematic
     
  • Model Rocket with Video Camera
     
  • Signal breaking module
     
  • RF serial link for robot
     
  • PIC based rocket altimeter
     
  • Robot with PIC16F84 brain & InfraRed eyes
     
  • 0-10V control for RC servos
     
  • Robotic microcontroller board
     
  • Multi Rocket Launcher
     
  • Model rocket launch controller
     
  • Pad launch controller for model rockets
     
  • Simple flashing light circuit
     
  • Simple flashing light circuit
     
  • A dual alternating flashing light circuit
     
  • Simple flashing light circuit
     
  • A dual tandem flashing light circuit powered by a 9 volt battery
     
  • Simulate the Gyralite (dual flashing headlights).
     
  • Simple train detector using ambient light and a photocell
     
  • Simple charge rate monitor
     
  • Deluxe charge rate monitor
     
  • "CLONEPAC" memory module for Futaba 8UAF/8UAP
     
  • Battery pack discharger
     
  • Plane locator
     
  • Plane locator 2
     
  • Battery low voltage alarm
     
  • Battery low voltage alarm 2
     
  • Ultimate battery low voltage alarm
     
  • R/C digital camera controller
     
  • R/C helicopter camera
     
  • Building an RF Remote Control System
     
  • Motor walker circuit
     
  • 250-amp Speed Controller for RC cars
     
  • Spider robot electronic project page
     
  • Two tone train horn
     
  • R/C Emergency locator alarm
     
  • Remote switch for radio-control aircraft accessories
     
  • Radio Control Battery Backup
     
  • Glow Plug driver for model engines
     

    Motor and general control schematics

  • Bridge head
     
  • PWM motor controller
     
  • Transistor relay driver
     
  • Latching relay driver
     
  • Relay delay circuit
     
  • Touch switch
     
  • Low voltage DC motor speed controller
     
  • Flashing neon christmas lights
     
  • Three input first response monitor
     
  • Switch-on delay circuit
     
  • Electronic thermostat
     
  • LM3911 temperature controller
     
  • Programmable light-activated relay
     
  • Simple 10 Stage Control Box
     
  • One component stepper motor driver
     
  • Dual Stepping motor drivers using UDN2540
     
  • PWM DC motor control with SG3525
     
  • Stepper Motor Driver using TEA3718/3717
     
  • Microstepping with PBM3960 and TEA3718
     
  • DC Motor Driver with L6203
     
  • Stepper Motor Driver using L298 and L297
     
  • Several stepper motorol control circuits
     
  • Wireless RF PWM dual motor controller
     
  • H Bridge Motor Control Circuits
     
  • Motor speed controllers
     
  • Ceiling fan speed control
     
  • Delayed off light switch
     
  • Deoderizer fan timer
     
  • Electronic Thermostat Relay Circuit
     
  • Interfacing 5 volt CMOS to 12 volt loads
     
  • Light Activated Relay
     
  • CMOS Toggle Flip Flop With Relay(CD4013)
     
  • 555 Timer Monostable Circuit Using Pushbutton
     
  • Dual Channel Servo Pulse to H-Bridge Interface
     
  • Current loop interface
     
  • Switching solenoid driver
     
  • Modular relay system
     
  • Light/dark detector
     
  • Pulse Width Modulation DC Motor Control
     
  • Stepper motor controller
     
  • Touch switch
     
  • Pump controller
     
  • H-Bridge motor controller (5 amps, 100 watts)
     
  • Dual Channel Servo Pulse to H-Bridge Interface
     
  • Servo pulse to PWM converter
     
  • 12V Sump Pump Control
     
  • Rolling code 4-channel UHF remote control
     
  • DC Motor Speed Controller
     
  • 3 Phase Brushless DC Motor Xtal Based Controller
     
  • DC motor controller
     
  • Garden moisture controller
     
  • Overload Voltage Protection with Automatic Reset
     
  • Pulse Width Modulator
     
  • Pulse Width Modulator Motor Speed Control
     
  • Pushbutton one-shot and latch (PDF)
     
  • Charge coupled bi-directional power MOSFET relay (PDF)
     
  • Finger touch activated switch (PDF)
     
  • Machine vibration triggers hour meter (PDF)
     
  • Solid state relay (PDF)
     
  • Line-powered Xenon flash transmitter (PDF)
     
  • 9V Xenon photoflash controller (PDF)
     
  • AC switching with TRIAC from TTL
     
  • Control 120VAC relay with TTL
     
  • Driving a relay with a CPU
     
  • Power-line Appliance Controller
     
  • Simple Switched Servo Driver
     
  • Combination-controlled, fully customizable RF remote control
     
  • Thermoelectic controller (scriptable thermometer)
     
  • Stepper motor positioner
     
  • Stepper motor driver
     
  • Thermostat
     
  • Frequency switch
     
  • PIC16F84 RF remote controller
     
  • H-Bridge shematic
     
  • DS1821 programmable thermostat
     
  • Hot Water Tank Indicator
     
  • Temperature monitor
     
  • Cold activated switch
     
  • Voltage comparator switch
     
  • Dark activated switch
     
  • DC Push Button Motor Control Circuit
     
  • Light detector
     
  • DC Motor Reversing Circuit
     
  • Sound operated switch
     
  • LDR light/dark activated relay switch
     
  • Touch Switches
     
  • 6090 digital decoder schematics
     
  • Assorted relay control circuits
     
  • Adjustable Voltage motor controller
     
  • Serial servo controller
     
  • DC Motor-Driver H-Bridge Circuit
     
  • PWM Motor Speed Controller / DC Light Dimmer
     
  • Constant Temperature Circuit
     
  • PWM DC Motor Speed Control
     
  • Solenoid starter
     
  • CO2 controller for planted tanks
     
  • Light activated relay
     
  • Delayed shutter control for Kodak DC-20
     
  • Gasoline generator automatic throttle controller
     
  • Block power switching module
     
  • MOSFET H-BRIDGE schematic and theory
     

    Music related schematics (also see Audio)

  • Audible metronome
     
  • Visual metronome
     
  • Peak-reading meters
     
  • Octave screamer
     
  • Amiga MIDI interface
     
  • Apple Mac to MIDI synthesizer interface cable
     
  • Apple Macintosh MIDI interface schematic (basic version)
     
  • Apple Macintosh MIDI interface schematic (deluxe version)
     
  • Standard MIDI to MIDI interface cable diagram
     
  • Simple MIDI switcher
     
  • MIDI interface / cable tester
     
  • MIDI keyboard
     
  • MIDI merger schematic
     
  • 25-pin PC serial port to MIDI synthesizer interface cable
     
  • 9-pin PC serial port to MIDI synthesizer interface cable
     
  • Serial MIDI interface
     
  • Microcontroller MIDI interface
     
  • MIDI keyboard circuit
     
  • Spring reverb unit
     
  • Colour organ light
     
  • MP3 Player
     
  • Metronome and pitch generator
     
  • Mini metronome
     
  • Compact Flash / IDE MP3 Player MKI
     
  • Simple colour organ
     
  • Guitar fuzz effect
     
  • 8 note tune player
     
  • Colour (Sound) Organ
     
  • Transisor organ
     
  • BookPC Car MP3 Player
     
  • Yet Another Mobile MP3 Player
     
  • Wave Multiplier for music synthesizers
     
  • Vibrato Circuit for Guitar, Steel, Bass, Etc.
     
  • MIDI status indicator
     
  • Zonk Machine and Treble Booster
     
  • Simple line mixer
     
  • Simple MIDI tester
     
  • MIDI Controller Footpedal
     
  • DIY Serial MIDI Interface (80C51/80C31 Version)
     
  • Electronic metronome
     
  • Sound Effects Generator
     
  • Sound Effects Generator 2
     
  • Digital Guitar Tuner
     
  • Drum tone oscillators
     
  • Analog MIDI synthesizer
     
  • Spring reverb
     
  • MIDI to CV interface
     
  • Dual phantom power pre-amp
     
  • Four channel fuzz box
     
  • Theremin controller
     
  • Vocal zapper
     
  • MIDI Drum Machine Analog Input Schematic
     
  • Guitar Reverb Pedal
     
  • Guitar Tremolo Unit
     
  • Spring Reverb Unit For Guitar
     
  • Ultra Simple Bass Guitar Compressor
     
  • Vox AC30 Guitar Amplifier Simulator
     
  • Guitar Vibrato Unit
     
  • Musical Instrument (Expandable) Graphic Equaliser
     
  • Midibox 64
     

    PC related schematics

  • I2C printer port adaptor
     
  • RS232C Level Converter
     
  • Isolated Full Duplex RS232C Interface
     
  • DB-9 Connector to DB-25 (both RS-232)
     
  • Mac Serial Port (RS-422 DIN-8) to RS-232 DB-25
     
  • Modem Rockwell RCV336/ACF model V1433VQR ext.
     
  • Genius Mouse schematics
     
  • EEPROM programmer
     
  • Commodore 64 24-bit parallel port interface with 8255
     
  • Sound Card Interface with Tone Keyer
     
  • RGB oo Monochrome converter - Matches impedance of PC to CCTV monitor
     
  • Ericsson phone to PC serial port interface
     
  • PC serial port receiver
     
  • Parallel port relay interface
     
  • ISA 48 I/O digital card
     
  • PC infrared iRDA interface using TFDS 4500
     
  • Jupiter card programmer
     
  • USB to RS232 Dongle
     
  • Parallel (Printer) Port Interface
     
  • RS-232 line monitor and loopback cables
     
  • The KD2BD Pacsat Modem
     
  • A Serial Infrared Remote Controller
     
  • PC Serial and Parallel Port Software and Interfaces
     
  • Interfacing 16x2 character :LCD to parallel port
     
  • RS-232 Protocol Analyser
     
  • Interface cable for Casio QV-200 digital camera
     
  • Radio clock for PC's
     
  • A PC-Based LowFER Frequency Synthesizer
     
  • General purpose 48-bit ISA parallel I/O card
     
  • Power from RS-232 port
     
  • PCI to ISA converter
     
  • WatchDog for ISA Bus
     
  • 4-channel 8-bit analog-to-digital converter for PC
     
  • Printer port ADC
     
  • Parallel port ADC based on MAX147
     
  • Analog Signal Acquisition for PC Printer Port
     
  • More accurate PC/AT clock
     
  • Getting power from RS-232 interface
     
  • Barcode scanner
     
  • Build your own iRDA SIR Transceiver (Dongle) using MCP2120
     
  • PC thermometer
     
  • Dive computer interface
     
  • Parallel port servo controller
     
  • GPS receiver (Gamin, Eagle etc) to PC interface cables
     
  • Connect two CD-ROM drives to one soundcard
     
  • Headphone driving circuit for soundcards
     
  • Get power out of PC parallel port
     
  • Null Printer Adapter
     
  • PC speaker volume control circuit
     
  • How to get power from PC to your circuits
     
  • RS-232 surge protection
     
  • Simple RS-232 serial port buffer circuit
     
  • Get power out of PC RS-232 port
     
  • Sound Blaster Microphone Preamplifier
     
  • Sega 3D glass interfacing circuits
     
  • Convert Atari-style joystick to PC joystick port
     
  • Fake Joystick circuit
     
  • Using the joystick port as general purpose input
     
  • Connect other circuits to PC joystick port
     
  • Schematic of a standard PC joystick
     
  • Simple PC SmartCard reader
     
  • Fax to modem interface
     
  • PC interface for point controller
     
  • Linux Infra-red Remote Control (LIRC)
     
  • Homebuilt RS232 LCD Interface
     
  • Compter microphone
     
  • Laptop Computer Serial Port Power Booster
     
  • Assorted computer interface circuits
     
  • HamComm Interface
     
  • Apple II/II+/IIe IDE Drive Interface
     
  • Basic Stamp I & PC Relay Controller
     
  • Hi-Fi PC Speaker System
     
  • IDE hard-disk interface for Amiga 500
     
  • How to construct Garmin GPS receiver interface cables
     
  • iRDA printer adapter
     
  • 160 Baud ALDL Hardware Interface
     
  • AT PC Power Supply 1
     
  • AT PC Power Supply 2
     
  • AT PC Power Supply 3
     
  • AT PC Power Supply 4
     
  • AT PC Power Supply 5
     
  • iLINK Interface
     
  • Digital Signals Decoding Interfaces
     
  • 9-pin null modem cable
     
  • RS232 - Lowe HF-225 interface
     
  • RS232 to IrDA convertor using Vishay TOIM3232
     
  • Interfacing PC sound card to SSB rig
     
  • Supply Derives Power From 3-Wire RS-232 Port
     
  • 24-line PC digital interface (PDF)
     

    PDA interfaces and related schematics

  • Casio interface circuits
     
  • SHARP palm-top/hand-held to RS232 serial converter
     
  • Interfacing ultrasonic range finder to BrainStem
     
  • Hamamatsu UVTron Interface to a BrainStem
     
  • Casio interface cable
     
  • Casio organiser hardware
     
  • MIDI interface for Palm computers
     
  • MIDI interface for Palm cradle
     
  • MIDI interface for Visor USB
     
  • MIDI-USB Cradle for Visor (Deluxe, Platinum)
     
  • MIDI interface for Visor
     
  • Casio datalogger
     
  • Interfacing ADXL202 accelerometer to PalmPilot
     
  • PalmPilot audio interface
     
  • PalmPilot cradle to modem adapter
     
  • PalmPilot connector pinouts
     
  • PalmPilot serial port interface
     
  • PalmPilot memory schematics
     
  • Aladin interface
     
  • PalmPilot turbo boost guage interface
     
  • IBM PC keyboard to PalmPilot interface
     
  • Aladin interface using op-amp
     
  • Wireless local network for PalmPilot (large PDF)
     

    Power supplies and control schematics

  • Power supply provides +5VDC regulated, +10VDC unregulated and 7.5VAC
     
  • 13.5KV power supply
     
  • Kirlian device supply
     
  • LM317 adjustable power supply
     
  • LTC1265 Nicad charger
     
  • Single cell lithium battery charger
     
  • Smart battery charger
     
  • Battery charge indicator
     
  • Lead acid trickle charger
     
  • 12B Battery condition indicator
     
  • Alkaline battery charger
     
  • Power Tool Torque Control
     
  • Generating Negative 5 Volts from 9 Volt Battery
     
  • LED Battery Condition Indicator
     
  • LM317 Variable Voltage Regulator
     
  • LM317 Regulator With Pass Transistor
     
  • High Current Regulated Power Supply
     
  • Simple Variable Voltage Source
     
  • Various switching power supplies
     
  • Variable 3 - 24 Volt / 3 Amp Power Supply
     
  • 2 watt switching power supply
     
  • Variable Voltage and Current Power Supply
     
  • Low Power DC to DC Converter
     
  • Constant Current Battery Charger
     
  • Intelligent NiMH/NiCd switched mode fast charger
     
  • Variable DC power supply
     
  • Nicad battery charger
     
  • Simple power supply
     
  • Voltage converter
     
  • Bench power supply
     
  • Easy power supply
     
  • Valve power supply
     
  • 6V to 12V Converter
     
  • Tesla coil / HV generator
     
  • High Current Power Supply
     
  • Dual Polarity Power Supply
     
  • High Voltage High Current Power Supply
     
  • Transformerless Power Supply
     
  • Fixed Voltage Power Supply
     
  • Voltage Inverter
     
  • Voltage Inverter
     
  • Dual power supply
     
  • 1A Variable Regulated Power Supply
     
  • Negative voltage generator
     
  • 12V battery capacity tester
     
  • NE555 Low Voltage Battery Disconnect Circuit
     
  • 33 Volt DC To DC Converter
     
  • Automatic AC voltage (110/240) selector
     
  • Variable 0-5A Current Source
     
  • Ground Fault Interupter
     
  • Intelligent battery charger
     
  • 12 Volt DC Load Control and Battery Protection
     
  • Low battery indicator
     
  • Variable power supply
     
  • Switching Power Supply
     
  • Low Power DC Quadrupler
     
  • Surge protector
     
  • Ultimate power supply
     
  • Variable Regulated Power Supply
     
  • Power reminder beeper (PDF)
     
  • Unplugged power cord alarm
     
  • Machine power loss beepter (PDF)
     
  • Low-dropout 12V regulator (LM324)
     
  • HV supply: 12VDC in, 12KV out
     
  • Generating -5VDC from +5VDC
     
  • Filtering PC bus POWER
     
  • Bidirectionall power inverter
     
  • Nagative voltage generation using 555 timer
     
  • High current regulated power supply
     
  • One 9V battery gives +18, +25, +33V
     
  • +9V *and* -9V from one battery
     
  • Battery charger
     
  • Adjustable power supply using LM317
     
  • Simple +5V power supply circuit
     
  • 12 Vdc - 120 Vac Inverter Schematic
     
  • +12V/-12V Power supply unit
     
  • +/-12V -> +/-5V Power unit
     
  • +5V Switching regulator (1)
     
  • Switching regulator (2)
     
  • Electric power controller
     
  • +30V power supply with +5V
     
  • +30V DC-DC converter
     
  • DC/AC inverter (2)
     
  • DC/AC inverter (1)
     
  • PIC16F873 DC motor speed controller
     
  • 12V 30A power supply
     
  • Dual regulated power supply
     
  • Fuse blown indicator
     
  • Gyrator circuit
     
  • Variable power supply
     
  • LM317 Regulator Circuit
     
  • Nicad battery charger
     
  • Regulated 12V supply
     
  • Unregulated power supply
     
  • Snowmobile GPS power adapter
     
  • Simple switching power supply
     
  • Assorted power source and control circuits
     
  • 12 volt battery monitor
     
  • 12 volt power supply
     
  • 5 volt power supply
     
  • Battery voltage monitor
     
  • LM3914 battery monitor
     
  • Multiple voltage power supply
     
  • Voltage doubler
     
  • Voltage inverter
     
  • PWM Motor Speed Controller / DC Light Dimmer
     
  • PWM Motor/Light Controller
     
  • Low Power LED Voltmeter
     
  • PWM Motor/Light Controller
     
  • PWM Motor/Light Controller variants
     
  • Low Power LED Voltmeter
     
  • Temperature Controlled NICD Charger
     
  • Simple Capacitance Multiplier Power Supply For Class-A Amplifiers
     
  • Simple DC Adapter Power Supply
     
  • Variable Dual Lab Power Supply
     
  • Battery Charger Ideas
     
  • Power control for arc welders and other inductive loads
     
  • Charger for gel lead acid batteries
     
  • Nicad battery cycler
     
  • Battery Characterizer
     
  • Nicad Battery Discharger/Capacity Indicator
     
  • 200 Watt Modified PC Power Supply 13.5 Volt 14 Amp
     

    Radio-frequency schematics (see Transmitters)

  • UHF oscillator
     
  • Economoy short-wave radio
     
  • Linearized RF detector
     
  • Two-band radio
     
  • Shortwave conveter for scanners
     
  • FM Bug
     
  • AM Radio
     
  • Toroidal coil RF shortwave receiver
     
  • Crystal radio
     
  • CW RECEIVER 40/80 meter CW receiver
     
  • TRF AM Receiver circuit
     
  • WLW 500KW Transmitter Schematic
     
  • AM-Receiver for Aircraft communication (118.250MHz)
     
  • AM receiver for aircraft communications
     
  • 80 Meter CW ARDF receiver
     
  • Four channel RF remote control
     
  • CW zero beat indicator (PDF)
     
  • Build your own VLF Receiver
     
  • Receiver building blocks
     
  • Simple wireless radio data link
     
  • RX3302 receiver module schematic
     
  • Superregenerative 27MHz receiver
     
  • 49MHz walkie-talkie
     
  • Convert 2m VHF FM PMR transceiver Motorola Radius M110 into an amateur radio
     
  • Vibrating pocket bug detector
     
  • 2MHz RF Oscillator
     
  • 50-150MHz Overtone Oscillator
     
  • Simple Op-Amp Radio
     
  • UHF - 100W Transistorized amplifier
     
  • 50MHz Converter
     
  • RF front-end for triple conversion GPS receiver
     
  • 2M - 20M transverter
     
  • Improved CMOS RF PLL sythesizer
     
  • Harmonic oscillator
     
  • Direction finder system
     
  • One transistor regenerative receiver
     
  • Synthesized HF receiver
     
  • TBA120 narrowband FM receiver
     
  • TDA7000 receiver
     
  • ZN414 receivers
     
  • 10W HF linear amplifier
     
  • 500W HF linear amplifier
     
  • 3W HF QRP linear amplifier
     
  • Phasing SSB exciter
     
  • 500mW HF linear amplifier
     
  • Generic VHF power amplifier
     
  • 10.7MHz FM detector
     
  • RTTY terminal unit
     
  • Q-multiplier
     
  • CMOS RF PLL sythesizer
     
  • 3W FM Transmitter
     
  • Crystal radio
     
  • Op-Amp Radio
     
  • Car radio tunes the Amateur Bands
     
  • Crystal set that requires no antenna
     
  • 80m Direct Conversion Receiver
     
  • A compact L-match ATU for portable use
     
  • Morse Adaptor for your VHF/UHF FM rig
     
  • An end-fed antenna, L-match coupler and resistive bridge for HF
     
  • AM Broadcast Band Regenerative Receiver
     
  • 50 MHz to 146 MHz Converter
     
  • Hear Amateurs on your Shortwave Radio!
     
  • Compact 20 14 MHz direct conversion receiver
     
  • Hear Amateurs on your FM Radio!
     
  • RF actuated CW monitor
     
  • LF to HF Converter
     
  • Super 80 ultra-simple SSB receiver for 3.5 MHz
     
  • Class B series modulator
     
  • L-Band PHEMT LNA for GPS, Inmarsat etc
     
  • Advanced VHF power meter
     
  • The MRX-40 Mini Receiver
     
  • 23cm Data Transceiver
     
  • AM Broadcast Band Active Antenna
     
  • Active antenna with gain
     
  • Ham Band VFO
     
  • HF Signal generator
     
  • Simple AM Radio Receiver & Amplifier
     
  • Bug detector
     
  • 175KHz inductive pulse receiver (PDF)
     
  • 200-400 MHz voltage controlled oscillator
     
  • AM/FM/SW active antenna
     
  • RF Sniffer <.5 to >500 MHz
     
  • Demodulator Schematic/Design
     
  • AM BCB radio receiver
     
  • Regenerative shortwave receiver
     
  • DSBSC (Double Side Band Supressed Carrier)
     
  • Frequency Synthesizer
     
  • Digital Automatic Gain Control (AGC)
     
  • Four Channel Wireless Transmitter and Receiver
     
  • Talking receiver
     
  • PLL synthesizing oscillator (1)
     
  • PLL synthesizing oscillator (2)
     
  • PLL synthesizing oscillator (3)
     
  • 2N2222 40 Meter CW/DSB Transceiver
     
  • Yaesu FT-736R doppler compensation
     
  • Phased lock loop schematic
     
  • 30M PSK31 Transceiver
     
  • SOP receiver (PDF)
     
  • SOP direct conversion receiver
     
  • Receiver
     
  • 30m direct conversion receiver
     
  • Popcorn direct conversion receiver
     
  • 40m direct conversion receiver
     
  • 80m direct conversion receiver
     
  • 136 kHz direct conversion receiver
     
  • One Watt 2.45 GHz Linear Amplifier
     
  • 222 MHz Transverter
     
  • VFO from 2001 ARRL Handbook, page 17.74
     
  • VFO from 2001 ARRL Handbook, page 14.20
     
  • Assorted RF circuits
     
  • 14MHz SSB 10mW Transceiver
     
  • Building a Simple LF Exciter
     
  • Yaesu band decoder schematic
     
  • VLF radio receiver schematic
     
  • 5 watt, 80 meter QRP CW Transceiver
     
  • How to Build a 300MHz AM, RF Remote Control System
     
  • RF Modem Robotics Project
     
  • PLL FM transmitter
     
  • Improved FM Stereo Modulator
     
  • Smooth Tone Clickless CW Sidetone Generator
     
  • Variety of receiver converter projects
     
  • One transistor FM receiver
     
  • 42 Mc Band to 88 Mc Band (retrofit converter) Project
     
  • Crystal radio circuits including diode performance comparison
     
  • 50MHz Assistant (Preamp & Power Amp.)
     
  • Bug detector
     
  • Basic RF oscillator
     
  • Radio Control Electric Switch
     
  • 56K RF Modem
     
  • 80M ARDF direction finder
     

    Solar-powered schematics

  • Sun tracking circuit for solar arrays
     
  • Solar power recharger
     
  • Solar power supply
     
  • Solar charge controller
     
  • Solar robots
     
  • Solar Tracker
     
  • 1381 solar engine
     
  • D1 solar engine
     
  • FLED solar engine
     
  • PM1 solar engine
     
  • Solar car array controller schematic
     
  • Solar car battery monitor schematic
     
  • Solar car brake controller schematic
     
  • Solar car main controller schematic
     
  • Solar car display controller schematic
     
  • Solar car electrical design and circuit index
     
  • Portable solar battery charger
     
  • Sensor Electronic Tracker with H-Bridge Drive
     
  • Sensor Electronic Tracker with Simple Solar Charge Controller
     
  • Solar tracking control system
     
  • LED7 solar tracker
     
  • Solar step-down regulator
     
  • Zener-based solar engine
     
  • AA battery solar charger
     
  • AA battery solar charger
     
  • Solar Panel Charge Controller / Low Voltage Disconnect Circuit
     
  • Solar Panel Current Meter
     
  • SCC2 10 Amp Solar Charge Controller
     
  • Solar Charged LED Flashlight
     
  • AA battery solar charger
     
  • Solar Panel Charge Controller / Low Voltage Disconnect Circuit
     
  • Solar Panel Current Meter
     
  • Solar cell Nicad charger
     
  • Solar powered dock lamp flasher
     

    Telephone and intercom related schematics

  • Telephone recording circuit
     
  • Infinity Transmitter Schematic and Plans
     
  • Digisound ring modulator
     
  • Incoming call indicator
     
  • Telephone Ring Generator Using 60Hz Power Transformer
     
  • Telephone Ring Generator Using Switching Power Supply
     
  • Telephone In-Use LED Indicator
     
  • Telephone In-Use Relay Circuit
     
  • Telephone Audio Interface
     
  • Home made PBX / PABX
     
  • Ringing Phone Light Flasher
     
  • Phone Busy Indicator
     
  • FM Telephone Bug
     
  • Cut Phone Line Detector
     
  • Simple Phone Tap
     
  • Telephone Hold Button
     
  • Telephone Recorder
     
  • DTMF Generator/Decoder
     
  • Interface cables for various cell phones
     
  • Telephone music on hold box
     
  • Telephone ring controlled relay
     
  • 1-line telephone status indicator (PDF)
     
  • Line in use indicator (PDF)
     
  • 4-line telephone status indicator (PDF)
     
  • Caller ID decoder
     
  • Telephone in use light
     
  • Detecting a telephone RING
     
  • Phone In-Use Light
     
  • Phone to audio interface
     
  • Phone Off-Hook Indicator
     
  • 'phone rang' indicator light
     
  • Phone Line to Audio
     
  • Phone in-use
     
  • Telephone Line Monitor
     
  • Use old phones as an intercom
     
  • Phone-In-Use indicator
     
  • Hold function for Telephone
     
  • Digital/Standard Phone Line Tester
     
  • Caller ID decoder part 1
     
  • Caller ID decoder part 2
     
  • DTMF decoder / logger
     
  • FM telephone bug
     
  • Universal telephone hold
     
  • Talking phone dial monitor
     
  • Telephone line simulator
     
  • Telephone privacy adapter
     
  • Telephone ringing circuits
     
  • Simple circuit to connect telephone equipment to audio mixer
     
  • NCDS Interface Schematic for Nokia 3110, 8110, 8110i
     
  • Assorted telephone circuits
     
  • Greek telecard reader
     
  • Phone ring circuit schematic
     
  • Cut phone line detector
     
  • Telephone autodialler
     
  • Taxi phone automatic dialler
     

    Test equipment schematics

  • Audible continuity tester
     
  • Wire tracer
     
  • Signal generator for signal tracer
     
  • Electronic level
     
  • Digital volt meter
     
  • Adjustable continuity tested
     
  • Frequency counter
     
  • Tri-Waveform Generator
     
  • 220V live wire-in-wall scanner
     
  • Owens Bridge Inductance Measurement Device
     
  • ESR Meter
     
  • Line Output / Flyback transformer tester
     
  • PC-Based Digital Storage Oscilloscope (DSOA)
     
  • PC Based Digital Storage Oscilloscope Mk3
     
  • Simple 6-Digit 40MHz Frequency Counter Module
     
  • Automatic stud detector
     
  • Capacitance meter
     
  • Capacitance meter
     
  • AC Line Current Detector
     
  • Triangle and Squarewave Generator
     
  • Signal tracer / injector
     
  • Voltage probe
     
  • Live line detector
     
  • Grid dip meter
     
  • PCB VSWR bridge
     
  • Electric field & leakage detector
     
  • Simple polarity detector
     
  • RCM710 Electronic Scale
     
  • 3 - 12 MHz Signal Generator
     
  • Some simple test equipment to build
     
  • RF Power Meter for the QRPer
     
  • Dip Oscillator for HF
     
  • Two Tone Audio Oscillator (use for SSB tests)
     
  • Simple pH meter
     
  • Temperature compensated pH meter
     
  • pH meter with calibration
     
  • Four Channel Oscilloscope Adapter
     
  • Arbitrary Waveform Generator
     
  • Digital Pressure Gauge
     
  • Remote Field Strength Meter
     
  • Digital frequency counter
     
  • Function generator
     
  • High / Low indicator
     
  • AC/DC LED Indicator
     
  • Micro ohm meter
     
  • Micro volt probe
     
  • MOSFET tester
     
  • Power factor meter
     
  • Ramp generator
     
  • LASER/LED light output intensity meter (PDF)
     
  • Frequency and capacitance meter
     
  • Resistor decade box
     
  • Simple light sensor adapter for oscilloscope
     
  • Time Domain Reflectometer (TDR)
     
  • pH Meter
     
  • Multi Wire Cable Tester
     
  • Connection tester
     
  • EMF field probe
     
  • Function generator
     
  • Logic probe
     
  • Zener diode tester
     
  • Mini DDS (direct digital synthesizer)
     
  • LCD frequency counter (PIC16F84)
     
  • Pulse Reading Logic Probe
     
  • Pink Noise Generator for Audio Testing
     
  • Audio Millivoltmeter
     
  • Audio Test Oscillator
     
  • Full Featured Transistor Tester
     
  • Opamp Design and Test Board
     
  • Microphone Circuit Test Oscillator
     
  • Distortion Analyser
     
  • Self Oscillating Amplifier for Distortion Testing
     
  • 120MHz frequency counter
     
  • Capacitance meter that connects to multimeter
     
  • Transistor tester and signal injector
     
  • Continuity tester
     
  • Square wave oscillator (555)
     
  • Build a Magnetic Field Immunity Tester
     
  • 555 Timer IC Tester
     
  • 555 go / no-go tester
     
  • 12V Lead-Acid Battery Monitor
     
  • Continuity tester 2
     
  • Continuity tester
     
  • Logic probe
     
  • 4-channel DSO for oscilloscope
     
  • In-circuit electrolytic tester
     
  • PIC logic probe with pulser
     

    Timing, oscillators etc. (schematics)

  • Budget timer
     
  • Long period timer
     
  • 555 time delay circuit
     
  • Low frequency clock
     
  • Countdown timer with relay
     
  • DDS using AD9835
     
  • 1 Second Time Base From Crystal Osc.
     
  • Power-On Time Delay Relay Circuit
     
  • Low Voltage , High Current Time Delay Circuit
     
  • Power-Off Time Delay Relay Circuit
     
  • Generating a Delayed Pulse With a dual 555 Timer
     
  • 1KHz Sinewave generator
     
  • Timed beeper
     
  • Time Delay Relay
     
  • Time Delay Relay
     
  • Wide-swing Variable Crystal Oscillator
     
  • Circuit that momentarily closes a pair of contacts at long intervals
     
  • Onboard Fogger Timer
     
  • Colpitts 1 to 20 MHz Crystal Oscillator
     
  • Divide By 1-1/2 Circuit
     
  • Simple sinewave generator
     
  • Two Transistor Sine Wave Oscillator
     
  • 10 Hz to 10 Khz VCO with Square and Triangle wave
     
  • Line powered 60Hz clock generator (PDF)
     
  • Micro-power pulse generator (PDF)
     
  • Darkroom camera shutter timer
     
  • Divide by 1.5 counter (PFD)
     
  • High-output square wave generator (PDF)
     
  • D Flip-flot one-shot circuits (PDF)
     
  • Clock divider
     
  • Clock doubler
     
  • CMOS oscillator
     
  • Crystal 32.768KHz CMOS Oscillator
     
  • Crystal oscillator
     
  • Cheap 40KHz clock
     
  • Stable 40KHz clock
     
  • 'Rounding Off' a square wave
     
  • Switch debounce using 555
     
  • Square wave to sine wave converter
     
  • Day / Night / 24 Hour Select Sensor
     
  • One transistor timer
     
  • Variable timer
     
  • Micropower pulse generator (PDF)
     
  • Square wave oscillator
     
  • Triangle wave oscillator
     
  • Sawtooth wave oscillator
     
  • Sine/Cosine wave oscillator
     
  • 555 timer
     
  • 555 oscillator
     
  • Stable multivibrator (IC)
     
  • Stable multivibrator (Transistor)
     
  • Push Button Switch Debouncer
     
  • Square wave oscillator
     
  • 5 to 30 Minute Timer
     
  • NE555 Basic Monostable
     
  • Mini DDS (Direct Digital Synthesis)
     
  • Astable Multivibrator
     
  • AD9852 DDS schematic
     
  • A GPS receiver based frequency standard
     
  • Monostable multivibrator
     
  • Clock generator
     
  • 555 Timer Tutorial + Circuits
     
  • Versatile electronic timer
     

    Transmitter schematics (also see RF)

  • Li'l 7 AM Transmitter Schematic
     
  • Wireless microphone
     
  • XTAL locked tone transmitter
     
  • AM oscillator for wireless microphones
     
  • Wireless microphone
     
  • 1W CW Transmitter
     
  • 433MHz transmitter using SAW resonator
     
  • A 3m (100 MHz) small bug
     
  • Basic FM Transmitter
     
  • Micro Power AM Broadcast Transmitter
     
  • FM Beacon Transmitter (88-108 MHz)
     
  • 1 valve CW transmitter
     
  • 250mW HF CW transmitter
     
  • 2 valve CW transmitter
     
  • Transmitter using LM317
     
  • 5 Watt HF CW transmitter
     
  • Simple FM microphone
     
  • FM bug
     
  • High power FM bug
     
  • 27MHz AM/CW transmitter
     
  • Easy 2-meter transmitter
     
  • QRP HF transmitter
     
  • Spark gap transmitter
     
  • QRP SSB transmitter
     
  • Crystal controlled FM transmitter
     
  • 150mW FM transmitter
     
  • FM transmitter
     
  • Two Valve 40m CW Transmitter
     
  • Frequency agile 80m CW QRP transmitter
     
  • 80 metre DSB transmitter
     
  • One Valve CW transmitter
     
  • Simple Low FER Transmitter
     
  • 7Mhz AM/CW Amateur Radio Transmitter
     
  • VHF FM transmitter
     
  • Simple FM transmitter
     
  • Wireless microphone
     
  • Shortwave radio transmitter
     
  • 175KHz inductive pulse transmitter (PDF)
     
  • 7MHz QRP transmitter
     
  • Small Radio Transmitter
     
  • FM Telephone Transmitter
     
  • Tracking transmitter
     
  • 5W PLL Transmitter
     
  • Miniature FM transmitter
     
  • Sensitive FM transmitter
     
  • Simple RF transmitter
     
  • 1.5 volt tracking transmitter
     
  • Tracking transmitter
     
  • Micro Power FM Broadcasting Circuits
     
  • Low Power FM Transmitter
     
  • RF/SS Handie Hopper Transmitter Schematic
     
  • 30-Meter QRP Transmitter for Morse Code
     
  • Miniature FM Transmitter #1
     
  • Miniature FM Transmitter #2
     
  • Miniature FM Transmitter #3
     
  • Light sensing RF transmitter
     
  • Micro-Spy with FETs
     
  • Micro-Spy with USW
     
  • Micro-Spy with TTL
     

    Video related schematics

  • Video Clock Superimposer
     
  • Simple AV (audio / video) wireless transmitter
     
  • Audio / video distribution amplifier
     
  • 10GHz video link
     
  • Experimental macrovision remover
     
  • 8 x 8 Audio-video switch
     
  • VHF/UHF TV modulator
     
  • LH0032 video amplifier
     
  • LM359N video amplifier
     
  • Macrovision code remover
     
  • Driver for multiple VGA monitors
     
  • CCD (charge coupled device) support board
     
  • Closed-Caption Decoder
     
  • PIC-Tock video clock
     
  • Video/Audio Wireless Transmitter
     
  • Video signal amplifier
     
  • RGB video digitizer
     
  • MC1374 based TV transmitter
     
  • TV transmitter
     
  • Simple TV transmitter
     
  • Color Bar Generator
     
  • Microcontroller test pattern generator
     
  • NTSC Video Distribution Amplifier
     
  • Commodore RF modulator
     
  • Video signal edge enhancement
     
  • Video amplifier
     
  • Video/Audio Wireless Transmitter
     
  • 4 Stage 555 Timer for Video Cam Control
     
  • Digital volt meter with video output
     
  • TV/Radio antenna cable galvanic isolator
     
  • S-video to composite video adapter
     
  • VGA converter for video projectors and fixed frequency monitors
     
  • VGA to TV converter
     
  • VGA to PAL and NTSC converter
     
  • PIC micro frame grabber (TDA8708)
     
  • Low cost audio/video modulator and transmitter
     
  • Many video amplifier circuits includiing transmission over UTP (PDF)
     
  • Commodore 64 Video Modulator 251025 Schematics
     
  • Commodore 64 Video Modulator 251696 Schematics
     
  • TV RGB signal output from a SVGA graphics card
     
  • Macrovision removal
     
  • AVR (AT90S2313) composite PAL colour bar generator
     
  • Homebuilt video digitizer Mark I
     
  • Homebuilt video digitizer Mark II
     
  • TV transmitter (PDF)
     
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