Audio / music
100W RMS
amplifier
3-way 4th
Order Active Crossovers for Car Audio
100W RMS
amplifier
3-way 4th
Order Active Crossovers for Car Audio
4W audio amplifier
8W audio amplifier
http://www.phy.ohiou.edu/~cigna/amps/
22W audio amplifier
50W audio amplifier
Audio line
isolator
Audio preamplifiers
Colour (sound) organ
Digital sample rate
converter
FET Audio mixer
Graphic equaliser
Guitar fuzz boxes
Guitar phaser
Headphone
amplifier
IC
audio preamp
LED VU meter
Low distortion
audio amplifier
Microphone
preamp
MIDI
passthrough circuit
Multi-Mix Headphone Distribution
Amp
Offset gain module
Paradoxical
sound synthesiser
Phono preamp
(valve)
Push-pull
class A 2A3 stereo amp (valve)
Push-pull
class A amp using type 5687 dual triodes
Ring modulator
SCMS killer for DAT
recorders
Signal generator
Simple colour organ
Single
Ended Class A2 SV811-10 Stereo Amp
Spring reverb unit
Transistor audio preamp
Transistor organ
Voltage controlled
amplifier
Voltage controlled
panner
Automotive
Breath Alcohol Tester controlling a car ignition system
Car battery charger
Wireless Auto Tachometer
Computer related (non PC specific)
Centronics port D/A
converter
Joystick related
projects
Getting
power from serial port
HDLC adaptor for
Atari ST
Null printer
adaptor
RS-232 port monitor
Serial port A/D
converter
Serial
port relay control
Consumer electronics
Add 200 channels
to PRO-43 scanner
Casio organiser interface
Home automation
project
IR remote control repeater
Sharp
organiser/pocket computer to RS-232 interface
The Propeller, a
mechanically scanned LED clock
Games and entertainment
Powerglove to serial
adaptor
Microcontroller related
68HC11 based
data-logger
Basic
stamp digital thermometer
Basic
stamp light direction sensing
Closed caption
decoder
F1 MC68HC11F1 based
microcontroller - full circuit and PCB layout
iRX 2.0 PIC based
microcontroller
Serial comms to LED
driver
Serial port break
reset circuit
Serial to parallel
converter using the AT89C2051
Weighscale
Models and model remote control
Auto Reversing Circuit for Model
Trains
Constant directional
lighting #1
Constant directional
lighting #2
Constant directional
lighting #3
Constant directional
lighting #4
Dual alternating flashing
light
Dual tandem flashing light
Flashing light circuit #1
Flashing light circuit #2
Flashing light circuit #3
Infrared train detector
Intelligent glowplug
driver
Simple train detector
Simulate gyrating headlight
Motor, light and power control
Battery discharger
and status check
Current sensing relay
driver
Diode constant lighting
Domestic heating
boiler control
Fluorescent Lamps, Ballasts,
and Fixtures
Light/dark activated relay
Power-line appliance controller
PWM light
bulb regulator
PWM motor speed
control
Servo motor info and schematics
More servo
motor info and schematics
Stepper motor
control circuit
Strobe light
Tacho generator
motor speed feedback
Temperature
controlled nicad charger
Temperature
regulator
TRIAC light dimmer
Using a solenoid activated start gate
Xenon flash and strobe
page
Oscillators and timers
Basic
RF oscillator
Clock
divider
Clock
doubler for CMOS logic
CW beacon keyer
IC
monostable multivibrator (555)
LM3909 LED flasher
Ramp generator, VCO,
tri-stable oscillator
Squarewave to sine converter
Timers: delay on
energise, delay on de-energise, latch
PC related
Barcode scanner
CCD video capture camera
- circuit on request
Collection of ASCII PC related schematics
Computer controlled IR device
Connecting an AOR AR8000 or AR2700
to an IBM PC
Connecting Sega 3D
glasses to a PC serial port
Data bus monitor
Interfacing the XC6200 Series
IR receiver for serial
interface
Serial port A/D
converter
Several PC related circuit and
information files for FTP
Simple parallel port
interface
TI-Calc to PC cable
Power supplies
12VDC To 120VAC
Inverter
12 Volt low drop-out voltage
regulated power supply
Adjustable power supply
Constructing low-voltage power supplies
Dual polarity power
supply
High current power
supply
Low-drop
regulator (postscript file)
Simple regulated
supply with overcurrent trip
RF circuits
1.5V
tracking transmitter
50MHz Assistant (Preamp & Power
Amp)
Active
antenna
AM radio
Broadcast- quality FM
transmitter
CW receiver for 40 and
80 metres
FET
dip-meter
FM transmitter
Light
sensing RF transmitter
Miniature FM transmitter #1
Miniature FM transmitter #2
Miniature FM transmitter #4
Op-amp radio
RF power meter
RF sniffer
Small FM
transmitter
Several
receiver circuits
Simplest RF transmitter
The smallest QRP
transceiver for 80 meters
Transistor tracking transmitter
Various CW and
AM transmitters
Robotics (also see Motor, light and power control)
Mobile robot
Robot limb
control system
Security and other sensors and
detectors
Collection of ASCII infrared related circuits
Garage door
hacker
Infrared active motion detector
Infrared detector
Infrared
to light converter
Rain detector
Security alarm
Smart card data monitor
Smart card to PC
interface
Stepper motor as an
encoder
Touch switches
More touch switches
Ultrasonic movement
detector
Voice controlled
switch
Science related/novelty
An inexpensive x- ray machine
Atom expander (LED light
show)
Black light (battery
powered invertor)
Building a
Jacob's Ladder
Circuit to show
chaotic dynamics
Ion detector
Laser power supply
(reported as suspect design)
HeNe and solid state laser
power supplies and notes (ASCII)
HeNe
and solid state laser power supplies and notes (similar to above)
Lie detector
Metal detector
Rich detector
Several nuclear
physics related circuits
Solid State Tesla
Coil/High Voltage Generator
Telephone related
Caller ID
Circuit for
phreaker's 'blue box'
Circuit
for phreaker's 'pearl box'
Circuit for
phreaker's 'red box'
Collection of ASCII phone related circuits
Cut phone line
detector
FM bug
FM telephone transmitter
Noise reduction (filter)
circuit
Phone busy indicator
Phone in use circuit
Telephone hold button
Telephone recorder
Telephone
recording beeper
Telephone remote
ringer
Universal telephone hold circuit
Test and measurement
20Msps
Digital storage oscilliscope
Digital tester
Digital PC Oscilloscope
Resister
substitution box
TempSentry
temperature sensor technical info and schematics
Files containing many circuits
Sci.electronics FAQ: Assorted ASCII Schematics
--- Headlight Reminder Circuit
--- Parallel Port DAC
--- Quiz-Show Indicator
--- Frequency and Capacitance meter
--- CMOS Oscillator
--- Adjustable flashing LED
--- LED Display controller
--- Info on CO2 lasers wanted (ho hum)
--- Crystal 32.768KHz CMOS Oscillator
--- Crystal Oscillator
--- FM Oscillator
--- Video amplifier
--- 'Nixie' display tubes
--- Condenser microphone hookup
--- Bringing NiCd's from the dead
--- Phase shifter circuit
--- Ultrasonic transducer oscillator circuit
--- RR LED flasher (alternating)
--- HV supply: 12VDC in, 12KV out
--- Generating -5VDC from +5VDC
--- Ground loops
--- Peltier coolers/heaters
Sci.Electronics FAQ: Repair: Misc Related Schematics (ASCII)
--- Simple High Voltage Generator
--- Adjustable high voltage power supply
--- Panasonic VCR switching power supply (PV48XX and clones)
--- Variable intensity variable frequency stroboscope
--- Jacobs Ladders
--- Introduction to Curve Tracers
--- Curve tracer design
--- Quick and dirty curve tracer
--- In-circuit tester
--- Kevin's strobe schematics
--- Inverter and trigger circuits
--- Tiny tiny invertor design
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