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Electronic Circuits
Here are some neat circuits you might want to try. The schematics and printed circuit board patterns are GIF's, and may show up different on some browsers. You might want to save the images (especially the PC board patterns) to your hard drive, load them into a photo editor (Photoshop, Paint Shop Pro, The GIMP, etc.) and adjust the size before you transfer the pattern to a board. Printed circuit board patterns are available possible. This page is always under construction and there will be new additions from time to time. Some of these circuits were designed by me, most are not. Whenever possible I have tried to credit the author of a circuit but since many of these circuits are from my personal collection that I have gathered over a period of many years, this information is not always available.

You can rank circuits according to how much you like a circuit by clicking on the lightning bolt icons. These ranks can be based on how much you like a circuit, whether a circuit worked or didn't work for you, or how useful you found a circuit. Additionally you can add your own comments at the bottom of each circuit by filling out the form.

Circuit Catagories

Circuits are divided into categories as listed below.

Catagory Circuits
Auto 3
Computer 2
Light/Laser 17
Major Projects 1
Other 20
Power Supply 16
Sound/Radio 19
Telephone 8
electronic circuits,electronics circuits supplies,electronic circuits design,PCB PWB design,

Some circuits in this list have little astrisk (*) markers beside them which give a basic amount of information regarding whether the circuit has been designed, tested or modified by the webmaster.

Marker Description
* The circuit has not been tested by me. Therefore, I will offer no gaurantee that they will work.
* This circuit has been designed by me.
* This circuit was not designed by me, but was modified by me.

Most Popular Circuits

The most popular circuits of today, yesterday and all time can be found below.

When Circuit Views
Today
Wednesday, February 13, 2008 12VDC To 120VAC Inverter 259
FM Transmitter 213
Yesterday
Tuesday, February 12, 2008 12VDC To 120VAC Inverter 627
FM Transmitter 509
Of All Time 12VDC To 120VAC Inverter 191,872
FM Transmitter 166,714

Auto Back to the top of this document
Detailed View: On/Off
Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 40,601 42 *
Car Alarm Arming Horn Beep Canceller NEW! bob 6,226 0 *
Wireless Auto Tachometer 52,870 36

Computer Back to the top of this document
Detailed View: On/Off
Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 24,974 24 *
Parallel (Printer) Port Interface 45,594 50

Light/Laser Back to the top of this document
Detailed View: On/Off
Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 57,574 40 *
3 Channel Spectrum Analyzer 19,260 9
40W Fluorescent Lamp Inverter Bart Milnes 41,653 36 *
Adjustable Strobe Light 41,549 16
Black Light 40,740 24
Colour (Sound) Organ 42,468 17
Fantastic Atom Expander 24,752 13
Flash Slave Trigger 30,654 11 *
Infa-Red Remote Control 92,074 151 *
IR Remote Jammer Carl 33,705 70 *
LASER Transmitter/Receiver 49,831 62
LED Chaser 52,768 48 *
LED Thermometer NEW! 11,583 3 *
Light/Dark Detector 38,306 59 *
Simple Colour Organ 13,862 5 *
Strobe Light 47,434 16 *
TRIAC Light Dimmer 63,571 38

Major Projects Back to the top of this document
Detailed View: On/Off
Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 63,037 108 *

Other Back to the top of this document
Detailed View: On/Off
Circuit Author Views Rank Comments Marker
7 Segment LED Counter 93,254 123 *
AC Motor Speed Controller NEW! 7,630 5 *
Air Flow Detector 31,134 34 *
Digital Keypad Combination Lock NEW! 6,314 5
Low Voltage Alarm 24,577 39 *
Pine Racecar Victory Judge 10,270 0 *
Pulse Width Modulation DC Motor Control 83,223 63
Rain Detector 39,058 70 *
Simple Lie Detector 75,828 215
Simple Polarity Tester Dudley LeRoux 16,132 10 *
Simple Servo Controller NEW! 5,195 1 *
Simple Two Speed Contactor DC Motor Controller 26,916 16 *
Stepper Motor Controller 95,315 70 *
Time Delay Relay 53,545 28
Time Delay Relay II jawaharlal@excite.com 27,843 22 *
Touch Switch 40,757 30 *
Video Activated Relay 12,905 6 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 22,060 4 *
Water Detector With Sump/Bilge Pump Controller NEW! 5,488 4 *
Wire Loop Alarm Alex Meaden 27,313 21 *

Power Supply Back to the top of this document
Detailed View: On/Off
Circuit Author Views Rank Comments Marker
12VDC To 120VAC Inverter 191,872 515
6V to 12V Converter 52,133 74
Automatic 12V Lead Acid Battery Charger 61,325 95
Automatic Load Sensing Power Switch NEW! 7,293 4 *
Car Battery Charger 128,205 85 *
Dual Polarity Power Supply 38,458 54 *
Fixed Voltage Power Supply 33,576 33 *
High Current Power Supply 44,408 43 *
High Voltage High Current Power Supply 34,433 13 *
LASER Power Supply 36,055 22
Portable CD Player Adapter For Car 29,003 8 *
Power Supply 111,306 199 *
Solid State Tesla Coil/High Voltage Generator 49,665 27
Transformerless Power Supply 57,881 78 *
Voltage Inverter 49,116 39 *
Voltage Inverter II 27,933 12 *

Sound/Radio Back to the top of this document
Detailed View: On/Off
Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 73,375 104
3 Watt FM Transmitter Rae XL Tkacik 37,158 49 *
50 Watt Amplifier 75,990 61
8 Note Tune Player 17,235 6 *
8 Watt Audio Amp 49,085 48 *
Aircraft Radio Communications Receiver NEW! 8,868 12 *
Crystal Radio 20,120 35 *
Digital Volume Control 45,932 30 *
Electronic Stethoscope 33,598 102 *
FET Audio Mixer 37,066 17
FM Transmitter 166,714 293
Guitar Fuzz Effect 24,885 20 *
Microphone Mixer Anatoly I. Shikhatov 28,857 16 *
Mono To Stereo Synthesizer oRbEq 15,212 12 *
Op Amp Radio 47,197 42 *
Sound Level Meter 47,006 26 *
Stereo Tube Amplifier Weslee Kinsler 32,156 8 *
Tone Control 35,853 8
Transistor Organ 21,356 12

Telephone Back to the top of this document
Detailed View: On/Off
Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 21,866 18 *
FM Telephone Bug 36,548 31
Phone Busy Indicator 27,451 10 *
Remote Telephone Ringer NEW! 5,765 0 *
Ringing Phone Light Flasher 26,117 17 *
Simple Phone Tap Derek Tombrello 58,277 54 *
Telephone Hold Button 13,512 5
Telephone Recorder This site contains lots of FREE electronic circuits (schematics) & do-it-yourself (DIY) circuit diagrams for hobbyists, students, professionals etc. covering a wide range of categories in electronics like audio, music,home/garden related,computer hardware,radio,robotics etc to name a few. There are also links to sites that offer hobby electronic kits and other electronics hobby related stuff. Use the menu on the left to browse different circuit categories. You can view the entire electronic circuit schematics index by clicking here.

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AC Power Controls
AC to AC Converters
AC to AC Power Supplies
AC to DC Converters
AC to DC Power Supplies
Acceleration Sensors / Monitors
Acoustic Circuits
Active Antenna
Active Filters
Band-pass
High-pass
Low-pass
Notch
Acquisitions Data Circuits
Adder Circuits
Air Conditioner (HVAC) Circuits
Air Flow Monitors
Aircraft Receivers
Alarm Circuits
AM (Amplitude Modulation) Circuits
AM Receiver Circuits
AM Transmitter Circuits
Amp Meters
Amplifiers
Audio
Buffer
Differential
High Frequency
High Gain
High Impedance
High Speed
Instrumentation
Intermediate Frequency
Limiting
Logarithmic
Low Noise
Microwave
Operational
Power
RF (Radio Frequency)
Trans impedance
Variable Gain
Video
Audio Mixers
Audio Oscillator Circuits
Amplitude Modulation (AM) Circuits
Analog to Digital (A/D) Circuits
Analog Multipliers
Analog Switches
Anemometer Circuits
Annunciator Circuits
Antenna Circuits
Aquarium Circuits
Astable Circuits
Attenuators
Audio Amplifiers
Audio Circuits
Accessories
Intercom
Level, Tone and Balance Controls
Mixers
Power Amplifiers
Preamplifiers
Stereo
Surround Sound
Audio Mixers
Audio Oscillator Circuits
Automatic Frequency Controls
Automatic Gain Control (AGC) Circuits
Automatic Level Control Circuits
Automotive Circuits

B
Balance Controls
Band-Pass Filters
Active
Passive
Battery Backup Circuits
Battery Chargers
Battery Monitors
Battery Testers
Barometer (Atmospheric Pressure)
Beeper & Buzzer Circuits
Biomedical Circuits
Bistable Multivibrators
Bridge Circuits
Buffer Circuits
Bug "Electronic" & Detectors
Bug/Insect Killers
Burglar Circuits
Buzzer Circuits

C
Camera Flashers
Camera Circuits
Capacitance Sensors
Capacitance Switches
Capacitors (Super) Circuits
Carrier Current Transceivers
Cell Phones
Charge Pump Circuits
Chopper Circuits
Clock Circuits
Code Practice Circuits
Color Organ Circuits
Colpits Oscillators
Compandor Circuits
Comparator Circuits
Computer Cables
Computer Interface
Conductivity Sensors
Contact Bounce Suppression Circuits
Control Circuits
Converters –
AC to AC
AC to DC
Analog to Digital (A/D)
Current to Voltage
DC to AC
DC to DC
Digital to Analog (D/A)
Frequency
Frequency to Voltage
Period to Voltage
RF (Radio Frequency)
Sine to Square Wave
Voltage
Voltage to Current
Voltage to Frequency
Wide Band
Constant Current Circuits
Cooling Fan Controls
Cosine
Counters and Timer Circuits
Crystal Oscillators
Cube Root
Current Limiters
Current Loop Circuits
Current Meters
Current Mirrors
Current Sensors / Monitors
Current Source/Sink Circuits
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