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
Sunday, March 15, 2026		 Automatic 12V Lead Acid Battery Charger23
12VDC To 120VAC Inverter23
Yesterday
Saturday, March 14, 2026		 12VDC To 120VAC Inverter53
Stepper Motor Controller43
Of All Time 12VDC To 120VAC Inverter1,561,486
FM Transmitter1,032,367

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,418 61 *
Car Alarm Arming Horn Beep Canceller bob 145,078 6 *
Wireless Auto Tachometer 353,867 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,096 29 *
Parallel (Printer) Port Interface 299,633 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,801 63 *
3 Channel Spectrum Analyzer 233,800 20
40W Fluorescent Lamp Inverter Bart Milnes 340,288 60 *
Adjustable Strobe Light 321,059 36
Black Light 295,819 29
Colour (Sound) Organ 303,143 36
Electronic Dice NEW! 199,603 10 *
Fantastic Atom Expander 211,927 25
Flash Slave Trigger 232,136 18 *
Infa-Red Remote Control 650,797 216 *
IR Remote Extender NEW! 143,121 3 *
IR Remote Jammer Carl 277,963 110 *
IR Remote Switch NEW! 167,409 9 *
LASER Transmitter/Receiver 430,194 92
LED Chaser 459,844 83 *
LED Metronome NEW! 109,145 3 *
LED Thermometer 216,098 22 *
Light/Dark Detector 315,599 90 *
Simple Colour Organ 146,459 11 *
Strobe Light 285,436 27 *
TRIAC Light Dimmer 566,391 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 372,563 122 *
Electromagnetic Levitator NEW! 153,873 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 939,241 214 *
AC Motor Speed Controller 407,294 29 *
Air Flow Detector 261,822 54 *
Digital Keypad Combination Lock 211,578 20
Low Voltage Alarm 239,713 58 *
Pine Racecar Victory Judge 111,295 1 *
Pulse Width Modulation DC Motor Control 668,564 94
Rain Detector 315,584 112 *
Simple Lie Detector 577,906 323
Simple Polarity Tester Dudley LeRoux 175,670 13 *
Simple Servo Controller 232,502 22 *
Simple Touch Switch NEW! 180,674 6 *
Simple Two Speed Contactor DC Motor Controller 215,919 21 *
Stepper Motor Controller 767,532 120 *
Time Delay Relay 568,058 88
Time Delay Relay II jawaharlal@excite.com 258,202 39 *
Touch Switch 300,850 51 *
Video Activated Relay 130,888 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,026 10 *
Water Detector With Sump/Bilge Pump Controller 162,966 18 *
Wire Loop Alarm Alex Meaden 215,153 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 333,893 25 *
12VDC To 120VAC Inverter 1,561,486 691
6V to 12V Converter 542,206 121
Automatic 12V Lead Acid Battery Charger 952,729 248
Automatic Load Sensing Power Switch 177,976 16 *
Car Battery Charger 897,428 159 *
Dual Polarity Power Supply 384,189 84 *
Fixed Voltage Power Supply 322,455 52 *
High Current Power Supply 354,194 66 *
High Voltage High Current Power Supply 275,507 35 *
LASER Power Supply 308,094 28
Portable CD Player Adapter For Car 222,585 12 *
Power Supply 752,789 259 *
Solid State Tesla Coil NEW! 159,613 4
Solid State Tesla Coil/High Voltage Generator 460,293 51
Transformerless Power Supply 475,621 117 *
Voltage Inverter 356,186 51 *
Voltage Inverter II 214,591 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,602 182
3 Watt FM Transmitter Rae XL Tkacik 351,641 83 *
50 Watt Amplifier 522,171 74
8 Note Tune Player 150,354 12 *
8 Watt Audio Amp 388,514 67 *
Aircraft Radio Communications Receiver 293,129 50 *
Crystal Radio 172,211 53 *
Digital Volume Control 351,655 47 *
Electronic Stethoscope 334,660 142 *
FET Audio Mixer 355,568 41
FM Transmitter 1,032,367 420
Guitar Fuzz Effect 261,027 54 *
Microphone Mixer Anatoly I. Shikhatov 262,026 26 *
Mono To Stereo Synthesizer oRbEq 145,764 18 *
One Tube Regenerative Radio NEW! 162,977 4 *
Op Amp Radio 404,275 80 *
Single Chip AM Radio NEW! 110,344 4 *
Single Chip FM Radio NEW! 185,695 1 *
Sound Level Meter 354,100 51 *
Stereo Tube Amplifier Weslee Kinsler 280,864 15 *
Tone Control 322,463 31
Transistor Organ 211,783 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,657 27 *
FM Telephone Bug 244,090 57
Phone Busy Indicator 223,550 24 *
Remote Telephone Ringer 127,174 3 *
Ringing Phone Light Flasher 231,019 35 *
Simple Phone Tap Derek Tombrello 393,706 98 *
Telephone Hold Button 138,166 10
Telephone Recorder 226,059 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.