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, November 05, 2025		 12VDC To 120VAC Inverter19
AC Motor Speed Controller18
Yesterday
Tuesday, November 04, 2025		 12VDC To 120VAC Inverter76
Simple Lie Detector63
Of All Time 12VDC To 120VAC Inverter1,555,590
FM Transmitter1,027,803

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,593 61 *
Car Alarm Arming Horn Beep Canceller bob 143,336 6 *
Wireless Auto Tachometer 351,645 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,600 29 *
Parallel (Printer) Port Interface 297,128 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 457,474 63 *
3 Channel Spectrum Analyzer 231,595 20
40W Fluorescent Lamp Inverter Bart Milnes 338,158 60 *
Adjustable Strobe Light 318,934 36
Black Light 293,185 29
Colour (Sound) Organ 300,674 36
Electronic Dice NEW! 197,551 10 *
Fantastic Atom Expander 210,103 25
Flash Slave Trigger 229,931 18 *
Infa-Red Remote Control 648,298 216 *
IR Remote Extender NEW! 141,036 3 *
IR Remote Jammer Carl 275,799 110 *
IR Remote Switch NEW! 165,368 9 *
LASER Transmitter/Receiver 427,780 92
LED Chaser 457,127 83 *
LED Metronome NEW! 107,226 3 *
LED Thermometer 214,381 22 *
Light/Dark Detector 313,752 90 *
Simple Colour Organ 144,696 11 *
Strobe Light 283,646 27 *
TRIAC Light Dimmer 563,712 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 369,848 122 *
Electromagnetic Levitator NEW! 152,036 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 935,467 214 *
AC Motor Speed Controller 404,437 29 *
Air Flow Detector 259,809 54 *
Digital Keypad Combination Lock 209,685 20
Low Voltage Alarm 237,583 58 *
Pine Racecar Victory Judge 109,641 1 *
Pulse Width Modulation DC Motor Control 665,965 94
Rain Detector 313,430 112 *
Simple Lie Detector 575,440 323
Simple Polarity Tester Dudley LeRoux 173,446 13 *
Simple Servo Controller 230,376 22 *
Simple Touch Switch NEW! 178,417 6 *
Simple Two Speed Contactor DC Motor Controller 213,811 21 *
Stepper Motor Controller 764,003 120 *
Time Delay Relay 565,759 88
Time Delay Relay II jawaharlal@excite.com 256,026 39 *
Touch Switch 298,747 51 *
Video Activated Relay 129,168 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 190,312 10 *
Water Detector With Sump/Bilge Pump Controller 160,786 18 *
Wire Loop Alarm Alex Meaden 213,419 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 330,104 25 *
12VDC To 120VAC Inverter 1,555,590 691
6V to 12V Converter 539,440 121
Automatic 12V Lead Acid Battery Charger 949,474 248
Automatic Load Sensing Power Switch 175,879 16 *
Car Battery Charger 894,754 159 *
Dual Polarity Power Supply 381,439 84 *
Fixed Voltage Power Supply 320,483 52 *
High Current Power Supply 351,417 66 *
High Voltage High Current Power Supply 273,222 35 *
LASER Power Supply 305,983 28
Portable CD Player Adapter For Car 220,439 12 *
Power Supply 750,245 259 *
Solid State Tesla Coil NEW! 156,690 4
Solid State Tesla Coil/High Voltage Generator 457,129 51
Transformerless Power Supply 473,194 117 *
Voltage Inverter 353,222 51 *
Voltage Inverter II 212,425 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 595,293 182
3 Watt FM Transmitter Rae XL Tkacik 348,761 83 *
50 Watt Amplifier 519,604 74
8 Note Tune Player 148,441 12 *
8 Watt Audio Amp 385,738 67 *
Aircraft Radio Communications Receiver 290,446 50 *
Crystal Radio 169,330 53 *
Digital Volume Control 349,145 47 *
Electronic Stethoscope 332,262 142 *
FET Audio Mixer 353,471 41
FM Transmitter 1,027,803 420
Guitar Fuzz Effect 258,265 54 *
Microphone Mixer Anatoly I. Shikhatov 259,897 26 *
Mono To Stereo Synthesizer oRbEq 143,456 18 *
One Tube Regenerative Radio NEW! 159,501 4 *
Op Amp Radio 401,712 80 *
Single Chip AM Radio NEW! 108,239 4 *
Single Chip FM Radio NEW! 183,119 1 *
Sound Level Meter 351,760 51 *
Stereo Tube Amplifier Weslee Kinsler 278,124 15 *
Tone Control 319,932 31
Transistor Organ 209,537 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,891 27 *
FM Telephone Bug 242,427 57
Phone Busy Indicator 221,639 24 *
Remote Telephone Ringer 125,225 3 *
Ringing Phone Light Flasher 228,474 35 *
Simple Phone Tap Derek Tombrello 391,704 98 *
Telephone Hold Button 136,482 10
Telephone Recorder 224,286 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.