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, November 14, 2025		 12VDC To 120VAC Inverter44
FM Transmitter39
Yesterday
Thursday, November 13, 2025		 Stepper Motor Controller52
FM Transmitter50
Of All Time 12VDC To 120VAC Inverter1,556,048
FM Transmitter1,028,254

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,747 61 *
Car Alarm Arming Horn Beep Canceller bob 143,498 6 *
Wireless Auto Tachometer 351,847 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,723 29 *
Parallel (Printer) Port Interface 297,381 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 457,748 63 *
3 Channel Spectrum Analyzer 231,819 20
40W Fluorescent Lamp Inverter Bart Milnes 338,349 60 *
Adjustable Strobe Light 319,118 36
Black Light 293,458 29
Colour (Sound) Organ 300,858 36
Electronic Dice NEW! 197,771 10 *
Fantastic Atom Expander 210,295 25
Flash Slave Trigger 230,115 18 *
Infa-Red Remote Control 648,613 216 *
IR Remote Extender NEW! 141,241 3 *
IR Remote Jammer Carl 276,007 110 *
IR Remote Switch NEW! 165,563 9 *
LASER Transmitter/Receiver 427,993 92
LED Chaser 457,312 83 *
LED Metronome NEW! 107,402 3 *
LED Thermometer 214,560 22 *
Light/Dark Detector 313,933 90 *
Simple Colour Organ 144,898 11 *
Strobe Light 283,800 27 *
TRIAC Light Dimmer 563,972 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,070 122 *
Electromagnetic Levitator NEW! 152,205 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 935,791 214 *
AC Motor Speed Controller 404,663 29 *
Air Flow Detector 259,971 54 *
Digital Keypad Combination Lock 209,865 20
Low Voltage Alarm 237,779 58 *
Pine Racecar Victory Judge 109,799 1 *
Pulse Width Modulation DC Motor Control 666,239 94
Rain Detector 313,668 112 *
Simple Lie Detector 575,659 323
Simple Polarity Tester Dudley LeRoux 173,734 13 *
Simple Servo Controller 230,545 22 *
Simple Touch Switch NEW! 178,581 6 *
Simple Two Speed Contactor DC Motor Controller 214,044 21 *
Stepper Motor Controller 764,363 120 *
Time Delay Relay 565,924 88
Time Delay Relay II jawaharlal@excite.com 256,290 39 *
Touch Switch 298,942 51 *
Video Activated Relay 129,398 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 190,631 10 *
Water Detector With Sump/Bilge Pump Controller 160,991 18 *
Wire Loop Alarm Alex Meaden 213,552 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 330,486 25 *
12VDC To 120VAC Inverter 1,556,048 691
6V to 12V Converter 539,676 121
Automatic 12V Lead Acid Battery Charger 949,697 248
Automatic Load Sensing Power Switch 176,077 16 *
Car Battery Charger 894,946 159 *
Dual Polarity Power Supply 381,723 84 *
Fixed Voltage Power Supply 320,676 52 *
High Current Power Supply 351,703 66 *
High Voltage High Current Power Supply 273,407 35 *
LASER Power Supply 306,198 28
Portable CD Player Adapter For Car 220,656 12 *
Power Supply 750,446 259 *
Solid State Tesla Coil NEW! 156,918 4
Solid State Tesla Coil/High Voltage Generator 457,420 51
Transformerless Power Supply 473,471 117 *
Voltage Inverter 353,509 51 *
Voltage Inverter II 212,628 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 595,480 182
3 Watt FM Transmitter Rae XL Tkacik 349,000 83 *
50 Watt Amplifier 519,831 74
8 Note Tune Player 148,657 12 *
8 Watt Audio Amp 385,948 67 *
Aircraft Radio Communications Receiver 290,700 50 *
Crystal Radio 169,564 53 *
Digital Volume Control 349,401 47 *
Electronic Stethoscope 332,484 142 *
FET Audio Mixer 353,665 41
FM Transmitter 1,028,254 420
Guitar Fuzz Effect 258,582 54 *
Microphone Mixer Anatoly I. Shikhatov 260,078 26 *
Mono To Stereo Synthesizer oRbEq 143,715 18 *
One Tube Regenerative Radio NEW! 159,843 4 *
Op Amp Radio 401,916 80 *
Single Chip AM Radio NEW! 108,400 4 *
Single Chip FM Radio NEW! 183,328 1 *
Sound Level Meter 351,950 51 *
Stereo Tube Amplifier Weslee Kinsler 278,362 15 *
Tone Control 320,148 31
Transistor Organ 209,722 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,079 27 *
FM Telephone Bug 242,538 57
Phone Busy Indicator 221,801 24 *
Remote Telephone Ringer 125,322 3 *
Ringing Phone Light Flasher 228,648 35 *
Simple Phone Tap Derek Tombrello 391,849 98 *
Telephone Hold Button 136,579 10
Telephone Recorder 224,424 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.