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
Wednesday, December 31, 2025		 Stereo Tube Amplifier19
8 Watt Audio Amp18
Yesterday
Tuesday, December 30, 2025		 7 Segment LED Counter39
High Current Power Supply37
Of All Time 12VDC To 120VAC Inverter1,558,159
FM Transmitter1,029,897

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,348 61 *
Car Alarm Arming Horn Beep Canceller bob 144,104 6 *
Wireless Auto Tachometer 352,546 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,205 29 *
Parallel (Printer) Port Interface 298,302 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,493 63 *
3 Channel Spectrum Analyzer 232,556 20
40W Fluorescent Lamp Inverter Bart Milnes 339,040 60 *
Adjustable Strobe Light 319,838 36
Black Light 294,314 29
Colour (Sound) Organ 301,726 36
Electronic Dice NEW! 198,475 10 *
Fantastic Atom Expander 210,906 25
Flash Slave Trigger 230,894 18 *
Infa-Red Remote Control 649,456 216 *
IR Remote Extender NEW! 141,918 3 *
IR Remote Jammer Carl 276,790 110 *
IR Remote Switch NEW! 166,300 9 *
LASER Transmitter/Receiver 428,790 92
LED Chaser 458,322 83 *
LED Metronome NEW! 108,065 3 *
LED Thermometer 215,100 22 *
Light/Dark Detector 314,538 90 *
Simple Colour Organ 145,512 11 *
Strobe Light 284,427 27 *
TRIAC Light Dimmer 564,799 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,829 122 *
Electromagnetic Levitator NEW! 152,826 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 937,365 214 *
AC Motor Speed Controller 405,760 29 *
Air Flow Detector 260,677 54 *
Digital Keypad Combination Lock 210,520 20
Low Voltage Alarm 238,557 58 *
Pine Racecar Victory Judge 110,341 1 *
Pulse Width Modulation DC Motor Control 667,067 94
Rain Detector 314,415 112 *
Simple Lie Detector 576,476 323
Simple Polarity Tester Dudley LeRoux 174,490 13 *
Simple Servo Controller 231,278 22 *
Simple Touch Switch NEW! 179,387 6 *
Simple Two Speed Contactor DC Motor Controller 214,737 21 *
Stepper Motor Controller 765,585 120 *
Time Delay Relay 566,765 88
Time Delay Relay II jawaharlal@excite.com 257,039 39 *
Touch Switch 299,677 51 *
Video Activated Relay 129,980 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 191,561 10 *
Water Detector With Sump/Bilge Pump Controller 161,760 18 *
Wire Loop Alarm Alex Meaden 214,161 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 331,755 25 *
12VDC To 120VAC Inverter 1,558,159 691
6V to 12V Converter 540,667 121
Automatic 12V Lead Acid Battery Charger 950,777 248
Automatic Load Sensing Power Switch 176,763 16 *
Car Battery Charger 895,915 159 *
Dual Polarity Power Supply 382,752 84 *
Fixed Voltage Power Supply 321,381 52 *
High Current Power Supply 352,701 66 *
High Voltage High Current Power Supply 274,170 35 *
LASER Power Supply 306,908 28
Portable CD Player Adapter For Car 221,450 12 *
Power Supply 751,330 259 *
Solid State Tesla Coil NEW! 157,978 4
Solid State Tesla Coil/High Voltage Generator 458,542 51
Transformerless Power Supply 474,326 117 *
Voltage Inverter 354,621 51 *
Voltage Inverter II 213,377 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,291 182
3 Watt FM Transmitter Rae XL Tkacik 350,099 83 *
50 Watt Amplifier 520,706 74
8 Note Tune Player 149,287 12 *
8 Watt Audio Amp 386,905 67 *
Aircraft Radio Communications Receiver 291,595 50 *
Crystal Radio 170,579 53 *
Digital Volume Control 350,288 47 *
Electronic Stethoscope 333,318 142 *
FET Audio Mixer 354,370 41
FM Transmitter 1,029,897 420
Guitar Fuzz Effect 259,537 54 *
Microphone Mixer Anatoly I. Shikhatov 260,801 26 *
Mono To Stereo Synthesizer oRbEq 144,476 18 *
One Tube Regenerative Radio NEW! 161,135 4 *
Op Amp Radio 402,808 80 *
Single Chip AM Radio NEW! 109,118 4 *
Single Chip FM Radio NEW! 184,288 1 *
Sound Level Meter 352,733 51 *
Stereo Tube Amplifier Weslee Kinsler 279,366 15 *
Tone Control 321,009 31
Transistor Organ 210,458 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,680 27 *
FM Telephone Bug 243,077 57
Phone Busy Indicator 222,436 24 *
Remote Telephone Ringer 126,034 3 *
Ringing Phone Light Flasher 229,498 35 *
Simple Phone Tap Derek Tombrello 392,493 98 *
Telephone Hold Button 137,119 10
Telephone Recorder 225,032 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.