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, July 10, 2026		 Automatic 12V Lead Acid Battery Charger81
Ringing Phone Light Flasher51
Yesterday
Thursday, July 09, 2026		 Ringing Phone Light Flasher95
Video Stabilizer/MacroVision Removal69
Of All Time 12VDC To 120VAC Inverter1,566,198
FM Transmitter1,036,501

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 237,825 61 *
Car Alarm Arming Horn Beep Canceller bob 146,412 6 *
Wireless Auto Tachometer 355,430 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 169,454 29 *
Parallel (Printer) Port Interface 301,719 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 461,897 63 *
3 Channel Spectrum Analyzer 235,643 20
40W Fluorescent Lamp Inverter Bart Milnes 341,803 60 *
Adjustable Strobe Light 322,833 36
Black Light 297,949 29
Colour (Sound) Organ 305,095 36
Electronic Dice NEW! 201,356 10 *
Fantastic Atom Expander 213,361 25
Flash Slave Trigger 233,761 18 *
Infa-Red Remote Control 653,058 216 *
IR Remote Extender NEW! 144,660 3 *
IR Remote Jammer Carl 280,051 110 *
IR Remote Switch NEW! 168,944 9 *
LASER Transmitter/Receiver 432,166 92
LED Chaser 462,073 83 *
LED Metronome NEW! 110,842 3 *
LED Thermometer 217,526 22 *
Light/Dark Detector 317,012 90 *
Simple Colour Organ 147,896 11 *
Strobe Light 286,959 27 *
TRIAC Light Dimmer 568,811 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 374,743 122 *
Electromagnetic Levitator NEW! 155,424 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 941,958 214 *
AC Motor Speed Controller 409,344 29 *
Air Flow Detector 263,527 54 *
Digital Keypad Combination Lock 213,064 20
Low Voltage Alarm 241,357 58 *
Pine Racecar Victory Judge 112,652 1 *
Pulse Width Modulation DC Motor Control 670,516 94
Rain Detector 317,347 112 *
Simple Lie Detector 579,709 323
Simple Polarity Tester Dudley LeRoux 177,293 13 *
Simple Servo Controller 234,115 22 *
Simple Touch Switch NEW! 182,302 6 *
Simple Two Speed Contactor DC Motor Controller 217,680 21 *
Stepper Motor Controller 770,160 120 *
Time Delay Relay 569,923 88
Time Delay Relay II jawaharlal@excite.com 259,767 39 *
Touch Switch 302,515 51 *
Video Activated Relay 132,285 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 194,994 10 *
Water Detector With Sump/Bilge Pump Controller 164,590 18 *
Wire Loop Alarm Alex Meaden 216,649 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 336,329 25 *
12VDC To 120VAC Inverter 1,566,198 691
6V to 12V Converter 544,625 121
Automatic 12V Lead Acid Battery Charger 955,359 248
Automatic Load Sensing Power Switch 179,612 16 *
Car Battery Charger 899,426 159 *
Dual Polarity Power Supply 386,113 84 *
Fixed Voltage Power Supply 323,964 52 *
High Current Power Supply 356,155 66 *
High Voltage High Current Power Supply 277,251 35 *
LASER Power Supply 309,894 28
Portable CD Player Adapter For Car 224,280 12 *
Power Supply 754,986 259 *
Solid State Tesla Coil NEW! 161,624 4
Solid State Tesla Coil/High Voltage Generator 463,126 51
Transformerless Power Supply 477,315 117 *
Voltage Inverter 358,392 51 *
Voltage Inverter II 216,294 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 599,245 182
3 Watt FM Transmitter Rae XL Tkacik 354,041 83 *
50 Watt Amplifier 523,978 74
8 Note Tune Player 151,788 12 *
8 Watt Audio Amp 390,945 67 *
Aircraft Radio Communications Receiver 295,190 50 *
Crystal Radio 174,324 53 *
Digital Volume Control 353,375 47 *
Electronic Stethoscope 337,007 142 *
FET Audio Mixer 357,314 41
FM Transmitter 1,036,501 420
Guitar Fuzz Effect 263,104 54 *
Microphone Mixer Anatoly I. Shikhatov 263,690 26 *
Mono To Stereo Synthesizer oRbEq 147,593 18 *
One Tube Regenerative Radio NEW! 165,420 4 *
Op Amp Radio 406,365 80 *
Single Chip AM Radio NEW! 111,890 4 *
Single Chip FM Radio NEW! 187,629 1 *
Sound Level Meter 355,864 51 *
Stereo Tube Amplifier Weslee Kinsler 282,610 15 *
Tone Control 324,222 31
Transistor Organ 213,643 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 174,097 27 *
FM Telephone Bug 245,597 57
Phone Busy Indicator 225,203 24 *
Remote Telephone Ringer 128,561 3 *
Ringing Phone Light Flasher 233,125 35 *
Simple Phone Tap Derek Tombrello 395,208 98 *
Telephone Hold Button 139,577 10
Telephone Recorder 227,497 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.