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, September 17, 2025		 12VDC To 120VAC Inverter39
Stepper Motor Controller35
Yesterday
Tuesday, September 16, 2025		 Black Light47
12V To 24V DC-DC Converter46
Of All Time 12VDC To 120VAC Inverter1,553,167
FM Transmitter1,025,777

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 233,688 61 *
Car Alarm Arming Horn Beep Canceller bob 142,499 6 *
Wireless Auto Tachometer 350,578 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,829 29 *
Parallel (Printer) Port Interface 295,752 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 456,309 63 *
3 Channel Spectrum Analyzer 230,526 20
40W Fluorescent Lamp Inverter Bart Milnes 337,240 60 *
Adjustable Strobe Light 317,855 36
Black Light 291,812 29
Colour (Sound) Organ 299,506 36
Electronic Dice NEW! 196,469 10 *
Fantastic Atom Expander 209,243 25
Flash Slave Trigger 228,947 18 *
Infa-Red Remote Control 647,068 216 *
IR Remote Extender NEW! 140,060 3 *
IR Remote Jammer Carl 274,698 110 *
IR Remote Switch NEW! 164,413 9 *
LASER Transmitter/Receiver 426,635 92
LED Chaser 455,708 83 *
LED Metronome NEW! 106,260 3 *
LED Thermometer 213,518 22 *
Light/Dark Detector 312,809 90 *
Simple Colour Organ 143,792 11 *
Strobe Light 282,728 27 *
TRIAC Light Dimmer 562,534 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 368,596 122 *
Electromagnetic Levitator NEW! 151,149 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 933,952 214 *
AC Motor Speed Controller 402,912 29 *
Air Flow Detector 258,924 54 *
Digital Keypad Combination Lock 208,724 20
Low Voltage Alarm 236,566 58 *
Pine Racecar Victory Judge 108,751 1 *
Pulse Width Modulation DC Motor Control 664,776 94
Rain Detector 312,445 112 *
Simple Lie Detector 574,055 323
Simple Polarity Tester Dudley LeRoux 172,377 13 *
Simple Servo Controller 229,337 22 *
Simple Touch Switch NEW! 177,404 6 *
Simple Two Speed Contactor DC Motor Controller 212,774 21 *
Stepper Motor Controller 762,235 120 *
Time Delay Relay 564,635 88
Time Delay Relay II jawaharlal@excite.com 254,982 39 *
Touch Switch 297,744 51 *
Video Activated Relay 128,311 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,212 10 *
Water Detector With Sump/Bilge Pump Controller 159,827 18 *
Wire Loop Alarm Alex Meaden 212,507 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 328,060 25 *
12VDC To 120VAC Inverter 1,553,167 691
6V to 12V Converter 538,175 121
Automatic 12V Lead Acid Battery Charger 948,163 248
Automatic Load Sensing Power Switch 174,897 16 *
Car Battery Charger 893,395 159 *
Dual Polarity Power Supply 380,201 84 *
Fixed Voltage Power Supply 319,562 52 *
High Current Power Supply 350,137 66 *
High Voltage High Current Power Supply 272,175 35 *
LASER Power Supply 304,997 28
Portable CD Player Adapter For Car 219,510 12 *
Power Supply 749,101 259 *
Solid State Tesla Coil NEW! 155,474 4
Solid State Tesla Coil/High Voltage Generator 455,766 51
Transformerless Power Supply 472,043 117 *
Voltage Inverter 351,698 51 *
Voltage Inverter II 211,424 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,261 182
3 Watt FM Transmitter Rae XL Tkacik 347,402 83 *
50 Watt Amplifier 518,392 74
8 Note Tune Player 147,582 12 *
8 Watt Audio Amp 384,319 67 *
Aircraft Radio Communications Receiver 289,314 50 *
Crystal Radio 168,000 53 *
Digital Volume Control 348,020 47 *
Electronic Stethoscope 331,056 142 *
FET Audio Mixer 352,495 41
FM Transmitter 1,025,777 420
Guitar Fuzz Effect 256,976 54 *
Microphone Mixer Anatoly I. Shikhatov 258,830 26 *
Mono To Stereo Synthesizer oRbEq 142,404 18 *
One Tube Regenerative Radio NEW! 157,793 4 *
Op Amp Radio 400,456 80 *
Single Chip AM Radio NEW! 107,304 4 *
Single Chip FM Radio NEW! 181,838 1 *
Sound Level Meter 350,644 51 *
Stereo Tube Amplifier Weslee Kinsler 276,868 15 *
Tone Control 318,747 31
Transistor Organ 208,443 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,080 27 *
FM Telephone Bug 241,675 57
Phone Busy Indicator 220,845 24 *
Remote Telephone Ringer 124,505 3 *
Ringing Phone Light Flasher 227,390 35 *
Simple Phone Tap Derek Tombrello 390,921 98 *
Telephone Hold Button 135,789 10
Telephone Recorder 223,562 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.