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
Wednesday, January 14, 2026		 12VDC To 120VAC Inverter19
Video Stabilizer/MacroVision Removal17
Yesterday
Tuesday, January 13, 2026		 12VDC To 120VAC Inverter51
FM Transmitter33
Of All Time 12VDC To 120VAC Inverter1,558,920
FM Transmitter1,030,360

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,585 61 *
Car Alarm Arming Horn Beep Canceller bob 144,306 6 *
Wireless Auto Tachometer 352,835 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,394 29 *
Parallel (Printer) Port Interface 298,584 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,767 63 *
3 Channel Spectrum Analyzer 232,842 20
40W Fluorescent Lamp Inverter Bart Milnes 339,324 60 *
Adjustable Strobe Light 320,089 36
Black Light 294,637 29
Colour (Sound) Organ 302,054 36
Electronic Dice NEW! 198,725 10 *
Fantastic Atom Expander 211,134 25
Flash Slave Trigger 231,142 18 *
Infa-Red Remote Control 649,738 216 *
IR Remote Extender NEW! 142,210 3 *
IR Remote Jammer Carl 277,048 110 *
IR Remote Switch NEW! 166,537 9 *
LASER Transmitter/Receiver 429,060 92
LED Chaser 458,646 83 *
LED Metronome NEW! 108,305 3 *
LED Thermometer 215,312 22 *
Light/Dark Detector 314,770 90 *
Simple Colour Organ 145,717 11 *
Strobe Light 284,663 27 *
TRIAC Light Dimmer 565,104 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 371,081 122 *
Electromagnetic Levitator NEW! 153,052 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 937,746 214 *
AC Motor Speed Controller 406,096 29 *
Air Flow Detector 260,932 54 *
Digital Keypad Combination Lock 210,769 20
Low Voltage Alarm 238,844 58 *
Pine Racecar Victory Judge 110,558 1 *
Pulse Width Modulation DC Motor Control 667,417 94
Rain Detector 314,650 112 *
Simple Lie Detector 576,822 323
Simple Polarity Tester Dudley LeRoux 174,754 13 *
Simple Servo Controller 231,567 22 *
Simple Touch Switch NEW! 179,697 6 *
Simple Two Speed Contactor DC Motor Controller 214,990 21 *
Stepper Motor Controller 765,979 120 *
Time Delay Relay 567,031 88
Time Delay Relay II jawaharlal@excite.com 257,316 39 *
Touch Switch 299,935 51 *
Video Activated Relay 130,189 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 191,901 10 *
Water Detector With Sump/Bilge Pump Controller 162,034 18 *
Wire Loop Alarm Alex Meaden 214,380 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 332,134 25 *
12VDC To 120VAC Inverter 1,558,920 691
6V to 12V Converter 541,014 121
Automatic 12V Lead Acid Battery Charger 951,227 248
Automatic Load Sensing Power Switch 177,022 16 *
Car Battery Charger 896,231 159 *
Dual Polarity Power Supply 383,067 84 *
Fixed Voltage Power Supply 321,596 52 *
High Current Power Supply 353,058 66 *
High Voltage High Current Power Supply 274,475 35 *
LASER Power Supply 307,153 28
Portable CD Player Adapter For Car 221,687 12 *
Power Supply 751,619 259 *
Solid State Tesla Coil NEW! 158,321 4
Solid State Tesla Coil/High Voltage Generator 458,931 51
Transformerless Power Supply 474,604 117 *
Voltage Inverter 354,966 51 *
Voltage Inverter II 213,648 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,567 182
3 Watt FM Transmitter Rae XL Tkacik 350,418 83 *
50 Watt Amplifier 521,004 74
8 Note Tune Player 149,554 12 *
8 Watt Audio Amp 387,248 67 *
Aircraft Radio Communications Receiver 291,926 50 *
Crystal Radio 170,912 53 *
Digital Volume Control 350,594 47 *
Electronic Stethoscope 333,582 142 *
FET Audio Mixer 354,630 41
FM Transmitter 1,030,360 420
Guitar Fuzz Effect 259,867 54 *
Microphone Mixer Anatoly I. Shikhatov 261,051 26 *
Mono To Stereo Synthesizer oRbEq 144,740 18 *
One Tube Regenerative Radio NEW! 161,513 4 *
Op Amp Radio 403,072 80 *
Single Chip AM Radio NEW! 109,371 4 *
Single Chip FM Radio NEW! 184,626 1 *
Sound Level Meter 353,011 51 *
Stereo Tube Amplifier Weslee Kinsler 279,700 15 *
Tone Control 321,342 31
Transistor Organ 210,744 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,895 27 *
FM Telephone Bug 243,286 57
Phone Busy Indicator 222,640 24 *
Remote Telephone Ringer 126,292 3 *
Ringing Phone Light Flasher 229,807 35 *
Simple Phone Tap Derek Tombrello 392,738 98 *
Telephone Hold Button 137,344 10
Telephone Recorder 225,243 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.