prof. Jacques Lepot
  ACCUEIL RESSOURCES COURS et DOCUMENTATIONS
Schémas sur le web 
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Miscellaneous schematics

  • Ultrasonic radar
  • Mobile APRS / GPS tracking system
  • 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
  • Bleeper box for time reference
  • Analog computer
  • BayComm packet modem
  • Morse monitor
  • HamComm modem interface
  • Morse paddle keyer
  • UV light box
  • Hardware Random Bit Generator
  • 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
  • Suddent ionospheric disturbance (SID) receiver
  • 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
  • GPS receiver support kit
  • Griffith Observatory Tesla Coil
  • Fogger smoke machine
  • Dinsmore 1490 digital compass
  • Geiger counter
  • Electric field disturbance monitor
  • Inexpensive seismometer project
  • Digital dial
  • Speech recognition using HM2007
  • 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
  • Navigator 555A radio direction finder (RDF) circuit diagram
  • Magnetic levitation circuit
  • PE3342 Programmer Schematic
  • u-Blox GPS receiver board
  • Assorted digital circuits
  • Basic electronic circuits
  • Miscellaneous simple circuits
  • Digital Call Sign Annunciator
  • Monitor output from Motorola Oncore GPS engine in HP Z3801A in GPS Disciplined Oscillator
  • Ultrasonic switch
  • Sound finding cricket with phase detector
  • Sound finding cricket
  • APRS GPS tracker schematic (PIC16C73)
  • Common Ground for Older VPW Circuit
  • 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
  • Stepper motor 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

  • 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 project
  • 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
  • Mp3 player module
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