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
Friday, March 13, 2026		 12VDC To 120VAC Inverter17
FM Transmitter14
Yesterday
Thursday, March 12, 2026		 12VDC To 120VAC Inverter54
Stepper Motor Controller53
Of All Time 12VDC To 120VAC Inverter1,561,371
FM Transmitter1,032,290

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,389 61 *
Car Alarm Arming Horn Beep Canceller bob 145,040 6 *
Wireless Auto Tachometer 353,819 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,070 29 *
Parallel (Printer) Port Interface 299,584 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,750 63 *
3 Channel Spectrum Analyzer 233,767 20
40W Fluorescent Lamp Inverter Bart Milnes 340,248 60 *
Adjustable Strobe Light 321,017 36
Black Light 295,752 29
Colour (Sound) Organ 303,089 36
Electronic Dice NEW! 199,558 10 *
Fantastic Atom Expander 211,899 25
Flash Slave Trigger 232,091 18 *
Infa-Red Remote Control 650,748 216 *
IR Remote Extender NEW! 143,080 3 *
IR Remote Jammer Carl 277,929 110 *
IR Remote Switch NEW! 167,377 9 *
LASER Transmitter/Receiver 430,157 92
LED Chaser 459,792 83 *
LED Metronome NEW! 109,120 3 *
LED Thermometer 216,063 22 *
Light/Dark Detector 315,556 90 *
Simple Colour Organ 146,429 11 *
Strobe Light 285,402 27 *
TRIAC Light Dimmer 566,339 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 372,516 122 *
Electromagnetic Levitator NEW! 153,844 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 939,186 214 *
AC Motor Speed Controller 407,246 29 *
Air Flow Detector 261,795 54 *
Digital Keypad Combination Lock 211,547 20
Low Voltage Alarm 239,674 58 *
Pine Racecar Victory Judge 111,268 1 *
Pulse Width Modulation DC Motor Control 668,512 94
Rain Detector 315,549 112 *
Simple Lie Detector 577,862 323
Simple Polarity Tester Dudley LeRoux 175,640 13 *
Simple Servo Controller 232,468 22 *
Simple Touch Switch NEW! 180,630 6 *
Simple Two Speed Contactor DC Motor Controller 215,879 21 *
Stepper Motor Controller 767,469 120 *
Time Delay Relay 568,013 88
Time Delay Relay II jawaharlal@excite.com 258,164 39 *
Touch Switch 300,821 51 *
Video Activated Relay 130,856 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 192,989 10 *
Water Detector With Sump/Bilge Pump Controller 162,939 18 *
Wire Loop Alarm Alex Meaden 215,122 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 333,840 25 *
12VDC To 120VAC Inverter 1,561,371 691
6V to 12V Converter 542,166 121
Automatic 12V Lead Acid Battery Charger 952,659 248
Automatic Load Sensing Power Switch 177,931 16 *
Car Battery Charger 897,374 159 *
Dual Polarity Power Supply 384,143 84 *
Fixed Voltage Power Supply 322,430 52 *
High Current Power Supply 354,141 66 *
High Voltage High Current Power Supply 275,469 35 *
LASER Power Supply 308,049 28
Portable CD Player Adapter For Car 222,546 12 *
Power Supply 752,745 259 *
Solid State Tesla Coil NEW! 159,557 4
Solid State Tesla Coil/High Voltage Generator 460,230 51
Transformerless Power Supply 475,579 117 *
Voltage Inverter 356,140 51 *
Voltage Inverter II 214,552 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,553 182
3 Watt FM Transmitter Rae XL Tkacik 351,585 83 *
50 Watt Amplifier 522,125 74
8 Note Tune Player 150,321 12 *
8 Watt Audio Amp 388,443 67 *
Aircraft Radio Communications Receiver 293,087 50 *
Crystal Radio 172,162 53 *
Digital Volume Control 351,600 47 *
Electronic Stethoscope 334,593 142 *
FET Audio Mixer 355,527 41
FM Transmitter 1,032,290 420
Guitar Fuzz Effect 260,976 54 *
Microphone Mixer Anatoly I. Shikhatov 261,992 26 *
Mono To Stereo Synthesizer oRbEq 145,706 18 *
One Tube Regenerative Radio NEW! 162,903 4 *
Op Amp Radio 404,213 80 *
Single Chip AM Radio NEW! 110,305 4 *
Single Chip FM Radio NEW! 185,646 1 *
Sound Level Meter 354,051 51 *
Stereo Tube Amplifier Weslee Kinsler 280,811 15 *
Tone Control 322,414 31
Transistor Organ 211,743 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,622 27 *
FM Telephone Bug 244,057 57
Phone Busy Indicator 223,517 24 *
Remote Telephone Ringer 127,140 3 *
Ringing Phone Light Flasher 230,968 35 *
Simple Phone Tap Derek Tombrello 393,668 98 *
Telephone Hold Button 138,123 10
Telephone Recorder 226,020 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.