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Alarms and security related schematics

bulletElectronic door codelock (PIC16F84)
bulletUltrasonic remote control & alarm system
bulletDigital entry lock
bulletProximity switch
bulletToxic Gas Detector
bulletDoor knob alarm (PDF)
bulletWater seepage alarm (PDF)
bulletMicro-power over temperature alarm (PDF)
bulletPersonal silent alarm system
bulletActive IR motion detector
bulletA Basic RF Transmitter for PIR Sensors
bulletPIR motion detector
bulletSimple alarm system
bulletAutomatic door opener using PIC12C508
bulletHome security project
bullet5 Zone alarm circuit
bulletMiniature loop alarm
bulletNovel Buzzer
bulletGate alarm circuit
bulletModular Burglar Alarm
bulletMotorcycle alarm
bulletEnhanced 5 Digit Alarm Keypad
bulletEnhanced 4 Digit Alarm Keypad
bulletRF Alarm
bulletSingle Zone Alarm
bulletWater Activated Alarm
bulletWater level alarm
bulletPerimeter monitor
bulletDigital combination lock
bulletAlarm control keypad
bulletAlmost Ultrasonic Motion Sensor
bulletTouch activated alarm system
bulletCombination Lock (PIC16F84)
bulletLow power RFID transponder
      

  

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Audio power amplifier schematics
bulletTwo transistor audio amplifier
bulletPersonal stereo audio amp
bulletHeadphone amplifier
bullet1.5W Audio amplifier
bulletLow-level audio amp
bullet10W amplifier
bullet80W amplifier
bulletLM383 12V Amplifier
bullet100W Amplifier
bullet18W Audio amplifier
bullet25W MOSFET amplifier
bulletHeadphone amplifier
bulletPortable headphone amplifier
bullet2W amplifier
bullet4W amplifier
bullet8 watt audio amp
bullet20W Amplifier
bullet50W Amplifier
bullet100W Audio amplifier
bullet100W RMS Amplifier
bullet2-Channel Power Amplifier
bulletPush-Pull Class A Amp using type 5687 dual triodes
bulletPush-Pull Class A 2A3 Stereo Amp
bulletSingle Ended Class A2 SV811-10 Stereo Amp
bulletAudio amplifier output relay delay
bulletSpatial Distortion Reduction Headphone Amp
bulletHeadBanger Headphone Amp
bullet2W Amplifier
bulletTDA2030 8 Watt amplifier
bulletHeadphone distribution amp
bulletHeadphone monitor amp
bullet50W audio power amplifier
bulletBi-Directional 2.4 GHz One Watt Amplifier
bulletBi-Directional 900Mhz One Watt Amplifier
bullet20 Watt GaAaFET Power on 2.3 GHz
bullet1 Watt 2.3 GHz RF Amplifier Using a MRF2001
bullet2.3 GHz Power Amplifiers
bullet2304 and 3456 MHz Power Amplifiers
bulletHigh quality exponential VCA
bullet16 Watt amplifier
bullet8 Watt amplifier
bulletPower amp schematic (PDF)
bullet20 Watt Class-A Power Amplifier
bulletEl-Cheapo - A Really Simple Power Amplifier
bulletSingle Chip 50 Watt / 8 Ohm Power Amplifier
bulletHi-Fi Headphone Amplifier
bullet100W Guitar Amplifier
bulletDeath of Zen (DoZ) - A New Class-A Power Amp
bulletSoft-Start Circuit For Power Amps
bulletThermo-Fan To Keep Your Amp Cool
bulletAudio Amp Output Power Limiter
bullet55W (Originally 75W) Power Amplifier
bullet300W Subwoofer Power Amplifier
bullet20 Watt / Channel Stereo Power Amplifier
bulletMini bench amplifier (LM386)
bullet12 Watt Valve Guitar Amp



 
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Audio preamp circuits
bulletMicrophone amplifier
bulletRIAA phono amplifier
bulletLow impedance microphone amplifier
bulletDynamic microphone preamplifier
bulletPhono preamp
bulletMasthead preamp
bulletPreamplifier for microphone or guitar use
bulletSimple microphone preamplifier
bulletTube microphone preamp
bulletSimple Stereo Electret Microphone Preamplifier
bulletSimple Stereo Electret Microphone Preamplifier
bulletPhono Preamp
bulletSimple microphone preamplifier
bulletECM Mic preamp
bulletHi Fi preamp
bulletBalanced microphone preamp
bulletAudio preamp
bulletElectret mic amplifier
bulletAudio preamplifier
bulletVacuum Tube Microphone Preamp
bulletFET Preamp Cable
bulletAudio preamp



Automative, car and motorcycle schematics
bulletElectronic auto stethoscope
bulletTurn signal alarm
bulletMotorcycle turn-signal system
bulletCigarette lighter 9V adaptor
bulletAnalog Tachometer for Gasoline Engines
bulletHeadlight On reminder with Light
bulletAdaptive Windscreen Wiper Control
bulletCar clock
bulletCar message display
bulletCar interval wiper
bulletSafety indicator light
bulletSpeed limit alert
bulletGrand Cherokee Off-Highway Lights
bulletEngine control unit schematics
bulletPortable CD Player Adapter For Car
bulletCar battery charger
bulletWireless Auto Tachometer
bulletAlternator Signal Detector
bulletAutomotive alarm system
bulletRoad ice alarm
bulletAutomotive Anti-Lock Brake Control Driver
bulletHeadlight reminder
bulletBreath Alcohol Tester controlling a car ignition system
bulletSimple car battery charger
bulletParking sonar
bulletFuel injector pulse width monitor
bulletBMW R Series Motorcycle Regulator Schematic
bullet80188XL Engine Tachometer
bulletIntegrate Fuel Pump Wire Security Cut Off with a Turbo Timer
bulletSimple Car Preamplifier and Artificial Earth
bulletFCD (Fuel Cut Defencer)
bulletInterface between GM's 5 Volt 8192 baud ALDL data stream and a PC serial port
bullet5301 wideband fuel mixture display
bulletWide Band Fuel Mixture Display
bullet3rd brake light
bullet12V to 9V car coverter
bulletCar Nicad charger
bulletCombination lock for car liftgate
bulletBMW motorcycle side stand protection mod



Data acquisition and data logging schematics
bulletAir flow detector
bulletAir flow detector
bulletStrain gauge sensor
bulletDigital Water Wave/Tide/Level Meter (PIC16F876)
bulletSelf made data-logger V2.5 (second edition)
bulletMagnetometer
bulletAnalog input section based on AD9220
bulletuModem 4+4/8 channel A/D board
bulletADXL202 accelerometer to CV output
bulletLight direction sensor
bullet12-Bit ADC interface
bulletDigital thermometer
bulletUniversal flight controllers / datalogger
bulletRain detector
bulletHome Brew Compass Sensor
bulletUsing 555 Timer as an A/D converter
bulletADC0804LCN 8-bit A/D converter
bulletWeb-based thermometer project
bulletLow Flow-Rate Thermal Flowmeter
bulletGeiger counter
bulletDifferential Capacitance Measurement for Tilt Meter
bulletHoney Bee counter (PDF)
bulletCapacitance type liquid level measurement (PDF)
bulletThermostat node schematic
bulletDigital PC Oscilloscope
bulletUltrasonic Range & Imager
bulletPrecision Digital Altimeter
bulletDigital compass schematic
bulletTemperature datalogger
bulletSerial Port A/D-converter
bulletCentronics port D/A converters and low-pass filter
bulletLCD Thermometer
bulletAcceleration monitor using Analog Devices ADXL202
bulletOptical sensor using PIC12C508
bulletWireless Liquid Level Sensing for Restaurant Applications
bulletAccelerometer Schematic
bulletPressure Sensor-Based Altimeter Circuit
bulletUltrasonic range finder circuit
bullet1-wire barometer
bulletWater-level sensor
bulletAddressable ADC
bulletElectronic altimeter using PIC16F877
bulletWireless weater station


Filter schematics
bulletGalaxy Noise Filter
bulletLow-pass active filter
bulletFilter Circuit for the Earthworm Seismic Data Acquisition System
bulletActive 2nd Order Filters
bulletRC Notch Filter (Twin T)
bulletMultiple Feedback Bandpass Filter
bulletCW filters
bulletSelf-tune filter
bulletSSB AF filter
bulletHelical Resonator Notch Filter
bullet3KHz low-pass filter plus audio amp (PDF)
bulletActive bandpass filters
bulletBandpass filters
bulletButterworth filters
bulletNarrow band audio bandpass filter
bulletInversal notch and bandpass filter
bulletDC Accurate, Active RC Lowpass Filter
bulletChebyshev Bandpass Filter
bulletBandpass filters
bulletChebyshev / Butterworth filters
bulletBiquad Active Bandpass Filter Schematic
bullet"A" Weighting Filter For Audio Measurements
bulletMultiple Feedback Bandpass Filter
bulletDigital signal processor (DSP) for radio communications
bullet29.85 MHZ bandpass filter schematic
bullet29.85 MHZ notch filter schematic
bulletLC filter design



Games and fun stuff (schematics)
bulletVisor cradle serial interface
bulletElectronic coin tosser
bulletElectronic craps game
bulletFirst response monitor
bulletVCR ping pong game
bulletVideo ping pong game
bulletMBC5/CPLD for the GameBoy
bulletGameBoy Camera Parallel Port Interface
bulletMobile robot (PDF)
bulletPSX controler to PC MIDI converter
bulletDreamcast PC serial adapter
bulletGameBoy Cart Programmer
bulletMemory game
bullet32 Kb x 8 emulator for the GameBoy
bulletProject: NES to Atari 2600 controller interface
bulletBattery Meter for Pinball Machines
bulletSRX1 (Stephane's Robotic eXperiment 1)
bulletPine Racecar Victory Judge
bulletInterfacing Sony control stick to Empeg
bulletElectronic Nicad glow plug driver
bulletApril Fools LEDs
bulletPinewood Derby logic
bulletQuiz Master
bulletGameBoy Schematic
bulletGameBoy LCD schematic
bulletGameBoy Power & Cartridge schematic
bulletGameBoy ROM+RAM+MBC1 Cart Schematic
bulletGameBoy MBC1 circuit equivalent
bulletSuper GameBoy schematic
bulletQuiz show indicator
bulletDreamcast interface
bulletBingo!!! (on your tv)
bulletSlot car TV cronograph
bulletFurby reverse-engineered circuit
bulletSanyo 20EZ monitor Arcade Game (300k ZIP)
bulletBurger Time Arcade Game (500k ZIP)
bulletDig Dug Arcade Game (800k ZIP)
bulletFrogger Arcade Game (500k ZIP)
bulletGalaga Arcade Game (542k ZIP)
bulletGyrus Arcade Game (800k ZIP)
bulletJunior Pacman Arcade Game (400k)
bulletLadybug Arcade Game (335k ZIP)
bulletMappy Arcade Game (470k ZIP)
bulletMoon Cresta Arcade Game (300k ZIP)
bulletMr.Do Arcade Game (554k ZIP)
bulletPacLand Arcade Game (316k ZIP)
bulletPengo Arcade Game (313k ZIP)
bulletQ*Bert Arcade Game (600k ZIP)
bulletQix Arcade Game (476k ZIP)
bulletScramble Arcade Game (600k ZIP)
bulletTime Pilot'84 Arcade Game (870k ZIP)
bulletXevious Arcade Game (450k ZIP)
bulletMagic Wand Conjuring Trick
bulletQuiz game circuit
bulletE.S.P. Conjuring Trick
bulletVideo game system using PIC18F252 (direct video generation)
bulletVideo game system using SX28 (direct video generation)
bulletDIT shutterglasses controller
bulletTic-tac-toe game using PIC16F628
bulletArchery timer
bulletPIC micro Tetris game
bulletMagic lamp, IR remote control jammer and other fun circuits (PDF)
bulletLego Mindstorms Double Rotation Sensor



Infrared based schematics
bulletIR detector
bulletInfrared body heat detector
bulletStereo IR audio receiver
bulletGeneral purpose IR receiver
bulletWireless IR headphone transmitter
bulletWireless IR headphone receiver
bulletInfrared remote control shutter release system
bulletInfrared transmitter for locomotives
bulletInfrared gate for door
bulletInfrared circuits for remote control
bulletSerial port controller infrared transmitter (PIC16F628)
bulletIR Receiver (Amplitude Modulated IR)
bulletIR Transmitter for Audio (Amplitude Modulated IR)
bulletDigibox interface
bulletIR remote control
bulletLong Range Infrared Remote
bulletiRDA to TTL interface
bullet40KHz light receiver (PDF)
bullet40KHz TV-VCR repeater (PDF)
bulletMicro based PIR to IR remote converter
bulletIR-related ASCII Schematics V1.00
bullet