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 Inverter8
High Current Power Supply7
Yesterday
Thursday, March 12, 2026		 12VDC To 120VAC Inverter54
Stepper Motor Controller53
Of All Time 12VDC To 120VAC Inverter1,561,362
FM Transmitter1,032,280

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,388 61 *
Car Alarm Arming Horn Beep Canceller bob 145,037 6 *
Wireless Auto Tachometer 353,813 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,069 29 *
Parallel (Printer) Port Interface 299,578 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,747 63 *
3 Channel Spectrum Analyzer 233,767 20
40W Fluorescent Lamp Inverter Bart Milnes 340,245 60 *
Adjustable Strobe Light 321,015 36
Black Light 295,745 29
Colour (Sound) Organ 303,085 36
Electronic Dice NEW! 199,556 10 *
Fantastic Atom Expander 211,898 25
Flash Slave Trigger 232,090 18 *
Infa-Red Remote Control 650,746 216 *
IR Remote Extender NEW! 143,080 3 *
IR Remote Jammer Carl 277,928 110 *
IR Remote Switch NEW! 167,377 9 *
LASER Transmitter/Receiver 430,154 92
LED Chaser 459,787 83 *
LED Metronome NEW! 109,119 3 *
LED Thermometer 216,063 22 *
Light/Dark Detector 315,555 90 *
Simple Colour Organ 146,427 11 *
Strobe Light 285,399 27 *
TRIAC Light Dimmer 566,336 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 372,515 122 *
Electromagnetic Levitator NEW! 153,842 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 939,180 214 *
AC Motor Speed Controller 407,244 29 *
Air Flow Detector 261,794 54 *
Digital Keypad Combination Lock 211,547 20
Low Voltage Alarm 239,671 58 *
Pine Racecar Victory Judge 111,266 1 *
Pulse Width Modulation DC Motor Control 668,509 94
Rain Detector 315,545 112 *
Simple Lie Detector 577,861 323
Simple Polarity Tester Dudley LeRoux 175,635 13 *
Simple Servo Controller 232,464 22 *
Simple Touch Switch NEW! 180,625 6 *
Simple Two Speed Contactor DC Motor Controller 215,875 21 *
Stepper Motor Controller 767,463 120 *
Time Delay Relay 568,007 88
Time Delay Relay II jawaharlal@excite.com 258,160 39 *
Touch Switch 300,819 51 *
Video Activated Relay 130,850 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 192,987 10 *
Water Detector With Sump/Bilge Pump Controller 162,937 18 *
Wire Loop Alarm Alex Meaden 215,115 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 333,838 25 *
12VDC To 120VAC Inverter 1,561,362 691
6V to 12V Converter 542,162 121
Automatic 12V Lead Acid Battery Charger 952,655 248
Automatic Load Sensing Power Switch 177,922 16 *
Car Battery Charger 897,370 159 *
Dual Polarity Power Supply 384,142 84 *
Fixed Voltage Power Supply 322,429 52 *
High Current Power Supply 354,135 66 *
High Voltage High Current Power Supply 275,467 35 *
LASER Power Supply 308,045 28
Portable CD Player Adapter For Car 222,544 12 *
Power Supply 752,742 259 *
Solid State Tesla Coil NEW! 159,554 4
Solid State Tesla Coil/High Voltage Generator 460,227 51
Transformerless Power Supply 475,575 117 *
Voltage Inverter 356,135 51 *
Voltage Inverter II 214,547 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,551 182
3 Watt FM Transmitter Rae XL Tkacik 351,583 83 *
50 Watt Amplifier 522,117 74
8 Note Tune Player 150,320 12 *
8 Watt Audio Amp 388,440 67 *
Aircraft Radio Communications Receiver 293,077 50 *
Crystal Radio 172,161 53 *
Digital Volume Control 351,595 47 *
Electronic Stethoscope 334,587 142 *
FET Audio Mixer 355,527 41
FM Transmitter 1,032,280 420
Guitar Fuzz Effect 260,976 54 *
Microphone Mixer Anatoly I. Shikhatov 261,988 26 *
Mono To Stereo Synthesizer oRbEq 145,701 18 *
One Tube Regenerative Radio NEW! 162,901 4 *
Op Amp Radio 404,212 80 *
Single Chip AM Radio NEW! 110,302 4 *
Single Chip FM Radio NEW! 185,642 1 *
Sound Level Meter 354,044 51 *
Stereo Tube Amplifier Weslee Kinsler 280,809 15 *
Tone Control 322,409 31
Transistor Organ 211,742 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,616 27 *
FM Telephone Bug 244,055 57
Phone Busy Indicator 223,513 24 *
Remote Telephone Ringer 127,138 3 *
Ringing Phone Light Flasher 230,962 35 *
Simple Phone Tap Derek Tombrello 393,668 98 *
Telephone Hold Button 138,122 10
Telephone Recorder 226,017 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.