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
Saturday, March 14, 2026		 12VDC To 120VAC Inverter35
Solid State Tesla Coil23
Yesterday
Friday, March 13, 2026		 12VDC To 120VAC Inverter43
FM Transmitter37
Of All Time 12VDC To 120VAC Inverter1,561,445
FM Transmitter1,032,334

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,408 61 *
Car Alarm Arming Horn Beep Canceller bob 145,060 6 *
Wireless Auto Tachometer 353,841 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,088 29 *
Parallel (Printer) Port Interface 299,612 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,780 63 *
3 Channel Spectrum Analyzer 233,788 20
40W Fluorescent Lamp Inverter Bart Milnes 340,269 60 *
Adjustable Strobe Light 321,041 36
Black Light 295,791 29
Colour (Sound) Organ 303,102 36
Electronic Dice NEW! 199,580 10 *
Fantastic Atom Expander 211,912 25
Flash Slave Trigger 232,112 18 *
Infa-Red Remote Control 650,773 216 *
IR Remote Extender NEW! 143,104 3 *
IR Remote Jammer Carl 277,944 110 *
IR Remote Switch NEW! 167,392 9 *
LASER Transmitter/Receiver 430,177 92
LED Chaser 459,822 83 *
LED Metronome NEW! 109,130 3 *
LED Thermometer 216,080 22 *
Light/Dark Detector 315,580 90 *
Simple Colour Organ 146,443 11 *
Strobe Light 285,419 27 *
TRIAC Light Dimmer 566,366 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 372,549 122 *
Electromagnetic Levitator NEW! 153,861 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 939,217 214 *
AC Motor Speed Controller 407,271 29 *
Air Flow Detector 261,808 54 *
Digital Keypad Combination Lock 211,559 20
Low Voltage Alarm 239,696 58 *
Pine Racecar Victory Judge 111,284 1 *
Pulse Width Modulation DC Motor Control 668,536 94
Rain Detector 315,567 112 *
Simple Lie Detector 577,884 323
Simple Polarity Tester Dudley LeRoux 175,654 13 *
Simple Servo Controller 232,479 22 *
Simple Touch Switch NEW! 180,648 6 *
Simple Two Speed Contactor DC Motor Controller 215,902 21 *
Stepper Motor Controller 767,494 120 *
Time Delay Relay 568,039 88
Time Delay Relay II jawaharlal@excite.com 258,185 39 *
Touch Switch 300,834 51 *
Video Activated Relay 130,879 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,008 10 *
Water Detector With Sump/Bilge Pump Controller 162,955 18 *
Wire Loop Alarm Alex Meaden 215,141 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 333,869 25 *
12VDC To 120VAC Inverter 1,561,445 691
6V to 12V Converter 542,192 121
Automatic 12V Lead Acid Battery Charger 952,699 248
Automatic Load Sensing Power Switch 177,955 16 *
Car Battery Charger 897,401 159 *
Dual Polarity Power Supply 384,172 84 *
Fixed Voltage Power Supply 322,447 52 *
High Current Power Supply 354,171 66 *
High Voltage High Current Power Supply 275,491 35 *
LASER Power Supply 308,070 28
Portable CD Player Adapter For Car 222,564 12 *
Power Supply 752,769 259 *
Solid State Tesla Coil NEW! 159,591 4
Solid State Tesla Coil/High Voltage Generator 460,261 51
Transformerless Power Supply 475,603 117 *
Voltage Inverter 356,171 51 *
Voltage Inverter II 214,580 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,580 182
3 Watt FM Transmitter Rae XL Tkacik 351,617 83 *
50 Watt Amplifier 522,151 74
8 Note Tune Player 150,343 12 *
8 Watt Audio Amp 388,482 67 *
Aircraft Radio Communications Receiver 293,107 50 *
Crystal Radio 172,188 53 *
Digital Volume Control 351,638 47 *
Electronic Stethoscope 334,630 142 *
FET Audio Mixer 355,544 41
FM Transmitter 1,032,334 420
Guitar Fuzz Effect 261,005 54 *
Microphone Mixer Anatoly I. Shikhatov 262,010 26 *
Mono To Stereo Synthesizer oRbEq 145,741 18 *
One Tube Regenerative Radio NEW! 162,953 4 *
Op Amp Radio 404,254 80 *
Single Chip AM Radio NEW! 110,323 4 *
Single Chip FM Radio NEW! 185,664 1 *
Sound Level Meter 354,070 51 *
Stereo Tube Amplifier Weslee Kinsler 280,841 15 *
Tone Control 322,437 31
Transistor Organ 211,764 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,640 27 *
FM Telephone Bug 244,076 57
Phone Busy Indicator 223,535 24 *
Remote Telephone Ringer 127,158 3 *
Ringing Phone Light Flasher 230,998 35 *
Simple Phone Tap Derek Tombrello 393,684 98 *
Telephone Hold Button 138,149 10
Telephone Recorder 226,045 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.