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
Thursday, January 29, 2026		 Automatic 12V Lead Acid Battery Charger17
One Tube Regenerative Radio16
Yesterday
Wednesday, January 28, 2026		 12VDC To 120VAC Inverter44
12V To 24V DC-DC Converter41
Of All Time 12VDC To 120VAC Inverter1,559,614
FM Transmitter1,030,856

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,785 61 *
Car Alarm Arming Horn Beep Canceller bob 144,526 6 *
Wireless Auto Tachometer 353,079 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,558 29 *
Parallel (Printer) Port Interface 298,847 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,018 63 *
3 Channel Spectrum Analyzer 233,081 20
40W Fluorescent Lamp Inverter Bart Milnes 339,591 60 *
Adjustable Strobe Light 320,327 36
Black Light 294,943 29
Colour (Sound) Organ 302,332 36
Electronic Dice NEW! 198,938 10 *
Fantastic Atom Expander 211,365 25
Flash Slave Trigger 231,404 18 *
Infa-Red Remote Control 650,006 216 *
IR Remote Extender NEW! 142,445 3 *
IR Remote Jammer Carl 277,233 110 *
IR Remote Switch NEW! 166,779 9 *
LASER Transmitter/Receiver 429,347 92
LED Chaser 458,910 83 *
LED Metronome NEW! 108,508 3 *
LED Thermometer 215,491 22 *
Light/Dark Detector 314,957 90 *
Simple Colour Organ 145,910 11 *
Strobe Light 284,861 27 *
TRIAC Light Dimmer 565,400 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 371,341 122 *
Electromagnetic Levitator NEW! 153,247 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 938,094 214 *
AC Motor Speed Controller 406,386 29 *
Air Flow Detector 261,158 54 *
Digital Keypad Combination Lock 210,969 20
Low Voltage Alarm 239,052 58 *
Pine Racecar Victory Judge 110,736 1 *
Pulse Width Modulation DC Motor Control 667,710 94
Rain Detector 314,868 112 *
Simple Lie Detector 577,114 323
Simple Polarity Tester Dudley LeRoux 174,999 13 *
Simple Servo Controller 231,818 22 *
Simple Touch Switch NEW! 179,971 6 *
Simple Two Speed Contactor DC Motor Controller 215,200 21 *
Stepper Motor Controller 766,372 120 *
Time Delay Relay 567,274 88
Time Delay Relay II jawaharlal@excite.com 257,524 39 *
Touch Switch 300,177 51 *
Video Activated Relay 130,357 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 192,197 10 *
Water Detector With Sump/Bilge Pump Controller 162,280 18 *
Wire Loop Alarm Alex Meaden 214,575 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 332,569 25 *
12VDC To 120VAC Inverter 1,559,614 691
6V to 12V Converter 541,296 121
Automatic 12V Lead Acid Battery Charger 951,572 248
Automatic Load Sensing Power Switch 177,241 16 *
Car Battery Charger 896,533 159 *
Dual Polarity Power Supply 383,339 84 *
Fixed Voltage Power Supply 321,818 52 *
High Current Power Supply 353,331 66 *
High Voltage High Current Power Supply 274,748 35 *
LASER Power Supply 307,384 28
Portable CD Player Adapter For Car 221,911 12 *
Power Supply 751,898 259 *
Solid State Tesla Coil NEW! 158,641 4
Solid State Tesla Coil/High Voltage Generator 459,271 51
Transformerless Power Supply 474,860 117 *
Voltage Inverter 355,263 51 *
Voltage Inverter II 213,875 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,858 182
3 Watt FM Transmitter Rae XL Tkacik 350,709 83 *
50 Watt Amplifier 521,302 74
8 Note Tune Player 149,780 12 *
8 Watt Audio Amp 387,579 67 *
Aircraft Radio Communications Receiver 292,247 50 *
Crystal Radio 171,246 53 *
Digital Volume Control 350,857 47 *
Electronic Stethoscope 333,816 142 *
FET Audio Mixer 354,855 41
FM Transmitter 1,030,856 420
Guitar Fuzz Effect 260,150 54 *
Microphone Mixer Anatoly I. Shikhatov 261,275 26 *
Mono To Stereo Synthesizer oRbEq 144,971 18 *
One Tube Regenerative Radio NEW! 161,851 4 *
Op Amp Radio 403,352 80 *
Single Chip AM Radio NEW! 109,614 4 *
Single Chip FM Radio NEW! 184,901 1 *
Sound Level Meter 353,243 51 *
Stereo Tube Amplifier Weslee Kinsler 280,020 15 *
Tone Control 321,656 31
Transistor Organ 211,021 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,058 27 *
FM Telephone Bug 243,488 57
Phone Busy Indicator 222,869 24 *
Remote Telephone Ringer 126,505 3 *
Ringing Phone Light Flasher 230,104 35 *
Simple Phone Tap Derek Tombrello 392,965 98 *
Telephone Hold Button 137,574 10
Telephone Recorder 225,443 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.