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, January 30, 2026		 12V To 24V DC-DC Converter19
Car Battery Charger16
Yesterday
Thursday, January 29, 2026		 12VDC To 120VAC Inverter36
One Tube Regenerative Radio29
Of All Time 12VDC To 120VAC Inverter1,559,652
FM Transmitter1,030,875

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,798 61 *
Car Alarm Arming Horn Beep Canceller bob 144,533 6 *
Wireless Auto Tachometer 353,092 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,563 29 *
Parallel (Printer) Port Interface 298,863 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,031 63 *
3 Channel Spectrum Analyzer 233,090 20
40W Fluorescent Lamp Inverter Bart Milnes 339,610 60 *
Adjustable Strobe Light 320,336 36
Black Light 294,964 29
Colour (Sound) Organ 302,344 36
Electronic Dice NEW! 198,948 10 *
Fantastic Atom Expander 211,372 25
Flash Slave Trigger 231,417 18 *
Infa-Red Remote Control 650,026 216 *
IR Remote Extender NEW! 142,454 3 *
IR Remote Jammer Carl 277,244 110 *
IR Remote Switch NEW! 166,787 9 *
LASER Transmitter/Receiver 429,363 92
LED Chaser 458,925 83 *
LED Metronome NEW! 108,514 3 *
LED Thermometer 215,501 22 *
Light/Dark Detector 314,964 90 *
Simple Colour Organ 145,917 11 *
Strobe Light 284,865 27 *
TRIAC Light Dimmer 565,416 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 371,357 122 *
Electromagnetic Levitator NEW! 153,262 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 938,116 214 *
AC Motor Speed Controller 406,406 29 *
Air Flow Detector 261,164 54 *
Digital Keypad Combination Lock 210,980 20
Low Voltage Alarm 239,059 58 *
Pine Racecar Victory Judge 110,747 1 *
Pulse Width Modulation DC Motor Control 667,725 94
Rain Detector 314,886 112 *
Simple Lie Detector 577,132 323
Simple Polarity Tester Dudley LeRoux 175,011 13 *
Simple Servo Controller 231,822 22 *
Simple Touch Switch NEW! 179,981 6 *
Simple Two Speed Contactor DC Motor Controller 215,213 21 *
Stepper Motor Controller 766,391 120 *
Time Delay Relay 567,283 88
Time Delay Relay II jawaharlal@excite.com 257,539 39 *
Touch Switch 300,185 51 *
Video Activated Relay 130,368 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 192,216 10 *
Water Detector With Sump/Bilge Pump Controller 162,293 18 *
Wire Loop Alarm Alex Meaden 214,583 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 332,600 25 *
12VDC To 120VAC Inverter 1,559,652 691
6V to 12V Converter 541,324 121
Automatic 12V Lead Acid Battery Charger 951,595 248
Automatic Load Sensing Power Switch 177,254 16 *
Car Battery Charger 896,556 159 *
Dual Polarity Power Supply 383,351 84 *
Fixed Voltage Power Supply 321,828 52 *
High Current Power Supply 353,338 66 *
High Voltage High Current Power Supply 274,761 35 *
LASER Power Supply 307,393 28
Portable CD Player Adapter For Car 221,923 12 *
Power Supply 751,913 259 *
Solid State Tesla Coil NEW! 158,659 4
Solid State Tesla Coil/High Voltage Generator 459,285 51
Transformerless Power Supply 474,870 117 *
Voltage Inverter 355,281 51 *
Voltage Inverter II 213,889 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,876 182
3 Watt FM Transmitter Rae XL Tkacik 350,726 83 *
50 Watt Amplifier 521,316 74
8 Note Tune Player 149,787 12 *
8 Watt Audio Amp 387,601 67 *
Aircraft Radio Communications Receiver 292,260 50 *
Crystal Radio 171,263 53 *
Digital Volume Control 350,872 47 *
Electronic Stethoscope 333,826 142 *
FET Audio Mixer 354,870 41
FM Transmitter 1,030,875 420
Guitar Fuzz Effect 260,161 54 *
Microphone Mixer Anatoly I. Shikhatov 261,287 26 *
Mono To Stereo Synthesizer oRbEq 144,986 18 *
One Tube Regenerative Radio NEW! 161,876 4 *
Op Amp Radio 403,365 80 *
Single Chip AM Radio NEW! 109,623 4 *
Single Chip FM Radio NEW! 184,915 1 *
Sound Level Meter 353,251 51 *
Stereo Tube Amplifier Weslee Kinsler 280,036 15 *
Tone Control 321,668 31
Transistor Organ 211,033 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,066 27 *
FM Telephone Bug 243,493 57
Phone Busy Indicator 222,887 24 *
Remote Telephone Ringer 126,515 3 *
Ringing Phone Light Flasher 230,117 35 *
Simple Phone Tap Derek Tombrello 392,984 98 *
Telephone Hold Button 137,585 10
Telephone Recorder 225,458 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.