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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 and 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