HEVL-ISET électronique digitale
prof. Jacques Lepot
ACCUEIL
RESSOURCES
COURS et DOCUMENTATIONS
Schémas sur le web
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Alarms and security schematics
Ultrasonic remote control & alarm system
Wire loop alarm
Door knob alarm (PDF)
Water seepage alarm (PDF)
Micro-power over temperature alarm (PDF)
A Basic RF Transmitter for PIR Sensors
PIR motion detector
Simple alarm system
Home security project
5 Zone alarm circuit
Miniature loop alarm
Novel Buzzer
Gate alarm circuit
Modular Burglar Alarm
Motorcycle alarm
Enhanced 5 Digit Alarm Keypad
Enhanced 4 Digit Alarm Keypad
RF Alarm
Single Zone Alarm
Water Activated Alarm
Water level alarm
Perimeter monitor
Digital combination lock
Alarm control keypad
Almost Ultrasonic Motion Sensor
Touch activated alarm system
Combination Lock (PIC16F84)
Audio power amplifier schematics
4W amplifier
8 watt audio amp
20W Amplifier
50W Amplifier
100W RMS 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
50W audio power amplifier
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
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
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
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
Precision Digital Altimeter
Digital compass schematic
Temperature datalogger
Serial Port A/D-converter
Centronics port D/A converters and low-pass filter
LCD Thermometer
Acceleration monitor using Analog Devices ADXL202
Optical sensor using PIC12C508
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
VCR ping pong game
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
Video game system using PIC18F252 (direct video generation)
Video game system using SX28 (direct video generation)
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
AVR (AT90S2313) serial port infrared receiver
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
RS-232 Laser Transceiver
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
Big 7-segment LED display board with SPI interface
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
Motorola 68K SBC (single board computer)
8051 SBC (single board computer)
Simple RS232C Level Converter using Transistors
Motorola 68HC11 evaluation board
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
Analog datalogger based on T89C51RD2
Atmel 89C Series Flash Microcontroller Programmer
Atmel 89C2051 prototype board
AT89C2051 real-time controller
PIC12C508 Night-light saver
AT89C2051 Night light saver
Atmel 8051 Flash Based-Microcontroller Programmer
AT89C2051 Digital thermometer and clock
4-Channel Timer using Atmel 89C4051 and MAX7219 display driver
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
Parallel AVR programmer
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
Microcontroller board using the Atmel AVR AT90S8535
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
90S2313 AVR Robot Board
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)
8051 Development System Circuit Board
Voice recording and message retrieval system
Interfacing a GPS to an LCD using a Microcontroller
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
8051 development system circuit board
8088 maximum mode single board computer (SBC)
Basic 89C2051 / 89C4051 circuit diagram
Debugging dump terminal for 89C2051 designs
Easy debugging terminal
Galvanic decoupling of I2C bus
Circuits interfacing piezo elements to a microcontroller
Driving a TRIAC using a PIC12C508
Isolated RS232C for PIC16F84
Microchip ICD (in-circuit debugger) circuit diagram
Microchip PIC ICSP implementation circuit diagram
Interfacing NMEA GPS to LCD using PIC16F84
PIC ICD (in-circuit debugger)
PIC16C71 morse code callsign generator
PIC16F84 to LCD interface
PIC16F84 I/O expander with PicBasic
Scanning 7-Segment & Keypad
10-key serial keypad encoder
Simple RS232C Level Converter using Transistors
Talking PIC microcontroller using SP0256
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
PS/2 keyboard keystroke logger based on Atmel 89C2051
Electronic distance meter based on Motorola 68HC908QY4
Fan timer based on Motorola 68HC908QT2
Atmel AVR and 8051 series ISP programmer
AT89C2051 line-follower robot
Night light saver (PIC12C508)
USB and GLCD expansion board for 8051 SBC
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
Atmel 89C2051 In-Circuit Programmer Schematic
8051 Development System Circuit Board
8051 Development System Circuit Board
Microprocessor using Xilinx FPGA
Temperature controlled based on AT89CX051
I2C LCD interface
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
Camera remote control system using Basic Stamp
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 ICD in-circuit debugger circuit diagram
PIC programmers for parallel port
Wisp628 ISP Microchip PIC Programmer
WLoader - PIC16F877 application loader / bootloader
Nixie clock (PIC16F876)
Zilog Z80 thermostat embedded web server
Picxie 2 - 8x8 Animated LED Signboard (PIC16F84) Picxie 2 - 8x8 Animated LED Signboard
Mp3 player module
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
