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 07, 2025		 Video Stabilizer/MacroVision Removal41
12VDC To 120VAC Inverter40
Yesterday
Thursday, November 06, 2025		 FM Transmitter65
Video Stabilizer/MacroVision Removal58
Of All Time 12VDC To 120VAC Inverter1,555,718
FM Transmitter1,027,931

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,633 61 *
Car Alarm Arming Horn Beep Canceller bob 143,381 6 *
Wireless Auto Tachometer 351,718 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,638 29 *
Parallel (Printer) Port Interface 297,208 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 457,562 63 *
3 Channel Spectrum Analyzer 231,669 20
40W Fluorescent Lamp Inverter Bart Milnes 338,207 60 *
Adjustable Strobe Light 318,982 36
Black Light 293,263 29
Colour (Sound) Organ 300,721 36
Electronic Dice NEW! 197,629 10 *
Fantastic Atom Expander 210,153 25
Flash Slave Trigger 229,983 18 *
Infa-Red Remote Control 648,391 216 *
IR Remote Extender NEW! 141,102 3 *
IR Remote Jammer Carl 275,864 110 *
IR Remote Switch NEW! 165,423 9 *
LASER Transmitter/Receiver 427,837 92
LED Chaser 457,177 83 *
LED Metronome NEW! 107,280 3 *
LED Thermometer 214,423 22 *
Light/Dark Detector 313,797 90 *
Simple Colour Organ 144,760 11 *
Strobe Light 283,681 27 *
TRIAC Light Dimmer 563,797 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 369,905 122 *
Electromagnetic Levitator NEW! 152,085 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 935,551 214 *
AC Motor Speed Controller 404,501 29 *
Air Flow Detector 259,847 54 *
Digital Keypad Combination Lock 209,744 20
Low Voltage Alarm 237,633 58 *
Pine Racecar Victory Judge 109,683 1 *
Pulse Width Modulation DC Motor Control 666,053 94
Rain Detector 313,508 112 *
Simple Lie Detector 575,490 323
Simple Polarity Tester Dudley LeRoux 173,537 13 *
Simple Servo Controller 230,424 22 *
Simple Touch Switch NEW! 178,457 6 *
Simple Two Speed Contactor DC Motor Controller 213,888 21 *
Stepper Motor Controller 764,085 120 *
Time Delay Relay 565,802 88
Time Delay Relay II jawaharlal@excite.com 256,107 39 *
Touch Switch 298,791 51 *
Video Activated Relay 129,238 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 190,436 10 *
Water Detector With Sump/Bilge Pump Controller 160,842 18 *
Wire Loop Alarm Alex Meaden 213,459 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 330,223 25 *
12VDC To 120VAC Inverter 1,555,718 691
6V to 12V Converter 539,501 121
Automatic 12V Lead Acid Battery Charger 949,541 248
Automatic Load Sensing Power Switch 175,931 16 *
Car Battery Charger 894,803 159 *
Dual Polarity Power Supply 381,512 84 *
Fixed Voltage Power Supply 320,536 52 *
High Current Power Supply 351,498 66 *
High Voltage High Current Power Supply 273,280 35 *
LASER Power Supply 306,056 28
Portable CD Player Adapter For Car 220,491 12 *
Power Supply 750,305 259 *
Solid State Tesla Coil NEW! 156,751 4
Solid State Tesla Coil/High Voltage Generator 457,209 51
Transformerless Power Supply 473,270 117 *
Voltage Inverter 353,292 51 *
Voltage Inverter II 212,489 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 595,346 182
3 Watt FM Transmitter Rae XL Tkacik 348,841 83 *
50 Watt Amplifier 519,662 74
8 Note Tune Player 148,497 12 *
8 Watt Audio Amp 385,799 67 *
Aircraft Radio Communications Receiver 290,517 50 *
Crystal Radio 169,382 53 *
Digital Volume Control 349,208 47 *
Electronic Stethoscope 332,319 142 *
FET Audio Mixer 353,528 41
FM Transmitter 1,027,931 420
Guitar Fuzz Effect 258,373 54 *
Microphone Mixer Anatoly I. Shikhatov 259,946 26 *
Mono To Stereo Synthesizer oRbEq 143,541 18 *
One Tube Regenerative Radio NEW! 159,608 4 *
Op Amp Radio 401,758 80 *
Single Chip AM Radio NEW! 108,285 4 *
Single Chip FM Radio NEW! 183,170 1 *
Sound Level Meter 351,816 51 *
Stereo Tube Amplifier Weslee Kinsler 278,208 15 *
Tone Control 319,997 31
Transistor Organ 209,593 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,947 27 *
FM Telephone Bug 242,453 57
Phone Busy Indicator 221,698 24 *
Remote Telephone Ringer 125,248 3 *
Ringing Phone Light Flasher 228,522 35 *
Simple Phone Tap Derek Tombrello 391,729 98 *
Telephone Hold Button 136,505 10
Telephone Recorder 224,317 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.