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 28, 2026		 12VDC To 120VAC Inverter19
Solid State Tesla Coil15
Yesterday
Friday, March 27, 2026		 12VDC To 120VAC Inverter43
Automatic 12V Lead Acid Battery Charger35
Of All Time 12VDC To 120VAC Inverter1,562,042
FM Transmitter1,032,746

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,548 61 *
Car Alarm Arming Horn Beep Canceller bob 145,206 6 *
Wireless Auto Tachometer 354,074 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 168,213 29 *
Parallel (Printer) Port Interface 299,876 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 460,022 63 *
3 Channel Spectrum Analyzer 233,978 20
40W Fluorescent Lamp Inverter Bart Milnes 340,471 60 *
Adjustable Strobe Light 321,267 36
Black Light 296,041 29
Colour (Sound) Organ 303,421 36
Electronic Dice NEW! 199,818 10 *
Fantastic Atom Expander 212,105 25
Flash Slave Trigger 232,337 18 *
Infa-Red Remote Control 651,016 216 *
IR Remote Extender NEW! 143,320 3 *
IR Remote Jammer Carl 278,183 110 *
IR Remote Switch NEW! 167,572 9 *
LASER Transmitter/Receiver 430,472 92
LED Chaser 460,085 83 *
LED Metronome NEW! 109,329 3 *
LED Thermometer 216,263 22 *
Light/Dark Detector 315,799 90 *
Simple Colour Organ 146,598 11 *
Strobe Light 285,604 27 *
TRIAC Light Dimmer 566,625 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 372,746 122 *
Electromagnetic Levitator NEW! 154,077 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 939,525 214 *
AC Motor Speed Controller 407,508 29 *
Air Flow Detector 261,994 54 *
Digital Keypad Combination Lock 211,755 20
Low Voltage Alarm 239,895 58 *
Pine Racecar Victory Judge 111,453 1 *
Pulse Width Modulation DC Motor Control 668,779 94
Rain Detector 315,814 112 *
Simple Lie Detector 578,119 323
Simple Polarity Tester Dudley LeRoux 175,843 13 *
Simple Servo Controller 232,682 22 *
Simple Touch Switch NEW! 180,839 6 *
Simple Two Speed Contactor DC Motor Controller 216,105 21 *
Stepper Motor Controller 767,852 120 *
Time Delay Relay 568,283 88
Time Delay Relay II jawaharlal@excite.com 258,389 39 *
Touch Switch 301,036 51 *
Video Activated Relay 131,025 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 193,215 10 *
Water Detector With Sump/Bilge Pump Controller 163,191 18 *
Wire Loop Alarm Alex Meaden 215,310 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 334,192 25 *
12VDC To 120VAC Inverter 1,562,042 691
6V to 12V Converter 542,495 121
Automatic 12V Lead Acid Battery Charger 953,034 248
Automatic Load Sensing Power Switch 178,155 16 *
Car Battery Charger 897,694 159 *
Dual Polarity Power Supply 384,400 84 *
Fixed Voltage Power Supply 322,625 52 *
High Current Power Supply 354,438 66 *
High Voltage High Current Power Supply 275,745 35 *
LASER Power Supply 308,283 28
Portable CD Player Adapter For Car 222,744 12 *
Power Supply 753,001 259 *
Solid State Tesla Coil NEW! 159,870 4
Solid State Tesla Coil/High Voltage Generator 460,619 51
Transformerless Power Supply 475,783 117 *
Voltage Inverter 356,455 51 *
Voltage Inverter II 214,788 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,793 182
3 Watt FM Transmitter Rae XL Tkacik 351,875 83 *
50 Watt Amplifier 522,411 74
8 Note Tune Player 150,510 12 *
8 Watt Audio Amp 388,778 67 *
Aircraft Radio Communications Receiver 293,383 50 *
Crystal Radio 172,404 53 *
Digital Volume Control 351,842 47 *
Electronic Stethoscope 334,892 142 *
FET Audio Mixer 355,772 41
FM Transmitter 1,032,746 420
Guitar Fuzz Effect 261,285 54 *
Microphone Mixer Anatoly I. Shikhatov 262,244 26 *
Mono To Stereo Synthesizer oRbEq 145,945 18 *
One Tube Regenerative Radio NEW! 163,213 4 *
Op Amp Radio 404,499 80 *
Single Chip AM Radio NEW! 110,535 4 *
Single Chip FM Radio NEW! 185,905 1 *
Sound Level Meter 354,302 51 *
Stereo Tube Amplifier Weslee Kinsler 281,051 15 *
Tone Control 322,690 31
Transistor Organ 211,978 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,813 27 *
FM Telephone Bug 244,241 57
Phone Busy Indicator 223,715 24 *
Remote Telephone Ringer 127,326 3 *
Ringing Phone Light Flasher 231,253 35 *
Simple Phone Tap Derek Tombrello 393,873 98 *
Telephone Hold Button 138,333 10
Telephone Recorder 226,198 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.