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
Monday, December 01, 2025		 7 Segment LED Counter18
12VDC To 120VAC Inverter12
Yesterday
Sunday, November 30, 2025		 FM Transmitter47
12VDC To 120VAC Inverter40
Of All Time 12VDC To 120VAC Inverter1,556,882
FM Transmitter1,028,977

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,943 61 *
Car Alarm Arming Horn Beep Canceller bob 143,721 6 *
Wireless Auto Tachometer 352,070 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,892 29 *
Parallel (Printer) Port Interface 297,687 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,009 63 *
3 Channel Spectrum Analyzer 232,064 20
40W Fluorescent Lamp Inverter Bart Milnes 338,587 60 *
Adjustable Strobe Light 319,364 36
Black Light 293,723 29
Colour (Sound) Organ 301,174 36
Electronic Dice NEW! 198,010 10 *
Fantastic Atom Expander 210,508 25
Flash Slave Trigger 230,365 18 *
Infa-Red Remote Control 648,913 216 *
IR Remote Extender NEW! 141,450 3 *
IR Remote Jammer Carl 276,237 110 *
IR Remote Switch NEW! 165,850 9 *
LASER Transmitter/Receiver 428,281 92
LED Chaser 457,634 83 *
LED Metronome NEW! 107,639 3 *
LED Thermometer 214,731 22 *
Light/Dark Detector 314,127 90 *
Simple Colour Organ 145,106 11 *
Strobe Light 284,006 27 *
TRIAC Light Dimmer 564,237 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,323 122 *
Electromagnetic Levitator NEW! 152,424 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 936,343 214 *
AC Motor Speed Controller 405,038 29 *
Air Flow Detector 260,214 54 *
Digital Keypad Combination Lock 210,070 20
Low Voltage Alarm 238,050 58 *
Pine Racecar Victory Judge 109,993 1 *
Pulse Width Modulation DC Motor Control 666,517 94
Rain Detector 313,945 112 *
Simple Lie Detector 575,936 323
Simple Polarity Tester Dudley LeRoux 174,023 13 *
Simple Servo Controller 230,773 22 *
Simple Touch Switch NEW! 178,878 6 *
Simple Two Speed Contactor DC Motor Controller 214,281 21 *
Stepper Motor Controller 764,821 120 *
Time Delay Relay 566,195 88
Time Delay Relay II jawaharlal@excite.com 256,545 39 *
Touch Switch 299,165 51 *
Video Activated Relay 129,598 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 190,994 10 *
Water Detector With Sump/Bilge Pump Controller 161,251 18 *
Wire Loop Alarm Alex Meaden 213,751 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 330,939 25 *
12VDC To 120VAC Inverter 1,556,882 691
6V to 12V Converter 540,048 121
Automatic 12V Lead Acid Battery Charger 950,087 248
Automatic Load Sensing Power Switch 176,331 16 *
Car Battery Charger 895,295 159 *
Dual Polarity Power Supply 382,102 84 *
Fixed Voltage Power Supply 320,940 52 *
High Current Power Supply 352,064 66 *
High Voltage High Current Power Supply 273,659 35 *
LASER Power Supply 306,449 28
Portable CD Player Adapter For Car 220,942 12 *
Power Supply 750,733 259 *
Solid State Tesla Coil NEW! 157,257 4
Solid State Tesla Coil/High Voltage Generator 457,773 51
Transformerless Power Supply 473,744 117 *
Voltage Inverter 353,912 51 *
Voltage Inverter II 212,892 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 595,735 182
3 Watt FM Transmitter Rae XL Tkacik 349,354 83 *
50 Watt Amplifier 520,147 74
8 Note Tune Player 148,866 12 *
8 Watt Audio Amp 386,279 67 *
Aircraft Radio Communications Receiver 290,990 50 *
Crystal Radio 169,901 53 *
Digital Volume Control 349,722 47 *
Electronic Stethoscope 332,771 142 *
FET Audio Mixer 353,891 41
FM Transmitter 1,028,977 420
Guitar Fuzz Effect 258,932 54 *
Microphone Mixer Anatoly I. Shikhatov 260,331 26 *
Mono To Stereo Synthesizer oRbEq 143,977 18 *
One Tube Regenerative Radio NEW! 160,286 4 *
Op Amp Radio 402,234 80 *
Single Chip AM Radio NEW! 108,645 4 *
Single Chip FM Radio NEW! 183,654 1 *
Sound Level Meter 352,235 51 *
Stereo Tube Amplifier Weslee Kinsler 278,732 15 *
Tone Control 320,446 31
Transistor Organ 209,976 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,263 27 *
FM Telephone Bug 242,691 57
Phone Busy Indicator 221,991 24 *
Remote Telephone Ringer 125,561 3 *
Ringing Phone Light Flasher 228,917 35 *
Simple Phone Tap Derek Tombrello 392,044 98 *
Telephone Hold Button 136,736 10
Telephone Recorder 224,630 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.