Electronic Circuits

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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 21
Major Projects 2
Other 21
Power Supply 18
Sound/Radio 22
Telephone 8

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, December 31, 2025		 Guitar Fuzz Effect14
8 Watt Audio Amp10
Yesterday
Tuesday, December 30, 2025		 7 Segment LED Counter39
High Current Power Supply37
Of All Time 12VDC To 120VAC Inverter1,558,151
FM Transmitter1,029,886

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,344 61 *
Car Alarm Arming Horn Beep Canceller bob 144,101 6 *
Wireless Auto Tachometer 352,542 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,200 29 *
Parallel (Printer) Port Interface 298,300 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,482 63 *
3 Channel Spectrum Analyzer 232,553 20
40W Fluorescent Lamp Inverter Bart Milnes 339,037 60 *
Adjustable Strobe Light 319,836 36
Black Light 294,307 29
Colour (Sound) Organ 301,724 36
Electronic Dice NEW! 198,472 10 *
Fantastic Atom Expander 210,904 25
Flash Slave Trigger 230,890 18 *
Infa-Red Remote Control 649,451 216 *
IR Remote Extender NEW! 141,913 3 *
IR Remote Jammer Carl 276,788 110 *
IR Remote Switch NEW! 166,294 9 *
LASER Transmitter/Receiver 428,787 92
LED Chaser 458,318 83 *
LED Metronome NEW! 108,059 3 *
LED Thermometer 215,096 22 *
Light/Dark Detector 314,531 90 *
Simple Colour Organ 145,509 11 *
Strobe Light 284,426 27 *
TRIAC Light Dimmer 564,796 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,824 122 *
Electromagnetic Levitator NEW! 152,824 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 937,360 214 *
AC Motor Speed Controller 405,758 29 *
Air Flow Detector 260,674 54 *
Digital Keypad Combination Lock 210,518 20
Low Voltage Alarm 238,555 58 *
Pine Racecar Victory Judge 110,339 1 *
Pulse Width Modulation DC Motor Control 667,062 94
Rain Detector 314,414 112 *
Simple Lie Detector 576,471 323
Simple Polarity Tester Dudley LeRoux 174,487 13 *
Simple Servo Controller 231,274 22 *
Simple Touch Switch NEW! 179,382 6 *
Simple Two Speed Contactor DC Motor Controller 214,729 21 *
Stepper Motor Controller 765,580 120 *
Time Delay Relay 566,761 88
Time Delay Relay II jawaharlal@excite.com 257,033 39 *
Touch Switch 299,670 51 *
Video Activated Relay 129,973 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 191,556 10 *
Water Detector With Sump/Bilge Pump Controller 161,757 18 *
Wire Loop Alarm Alex Meaden 214,159 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 331,746 25 *
12VDC To 120VAC Inverter 1,558,151 691
6V to 12V Converter 540,661 121
Automatic 12V Lead Acid Battery Charger 950,773 248
Automatic Load Sensing Power Switch 176,762 16 *
Car Battery Charger 895,911 159 *
Dual Polarity Power Supply 382,743 84 *
Fixed Voltage Power Supply 321,380 52 *
High Current Power Supply 352,695 66 *
High Voltage High Current Power Supply 274,166 35 *
LASER Power Supply 306,903 28
Portable CD Player Adapter For Car 221,447 12 *
Power Supply 751,327 259 *
Solid State Tesla Coil NEW! 157,973 4
Solid State Tesla Coil/High Voltage Generator 458,538 51
Transformerless Power Supply 474,324 117 *
Voltage Inverter 354,619 51 *
Voltage Inverter II 213,372 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,288 182
3 Watt FM Transmitter Rae XL Tkacik 350,094 83 *
50 Watt Amplifier 520,701 74
8 Note Tune Player 149,282 12 *
8 Watt Audio Amp 386,897 67 *
Aircraft Radio Communications Receiver 291,589 50 *
Crystal Radio 170,572 53 *
Digital Volume Control 350,285 47 *
Electronic Stethoscope 333,314 142 *
FET Audio Mixer 354,364 41
FM Transmitter 1,029,886 420
Guitar Fuzz Effect 259,535 54 *
Microphone Mixer Anatoly I. Shikhatov 260,793 26 *
Mono To Stereo Synthesizer oRbEq 144,470 18 *
One Tube Regenerative Radio NEW! 161,127 4 *
Op Amp Radio 402,801 80 *
Single Chip AM Radio NEW! 109,112 4 *
Single Chip FM Radio NEW! 184,279 1 *
Sound Level Meter 352,725 51 *
Stereo Tube Amplifier Weslee Kinsler 279,357 15 *
Tone Control 321,008 31
Transistor Organ 210,450 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,673 27 *
FM Telephone Bug 243,071 57
Phone Busy Indicator 222,435 24 *
Remote Telephone Ringer 126,031 3 *
Ringing Phone Light Flasher 229,496 35 *
Simple Phone Tap Derek Tombrello 392,489 98 *
Telephone Hold Button 137,118 10
Telephone Recorder 225,028 55 *

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All material marked as mine is property of Aaron Cake. You may, however, distribute it as much as you want, with or without credit to me. Just don't claim credit for it yourself, and it would be nice if you included a link back to my page. All other material is property of its authors.