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 Inverter43
Stepper Motor Controller42
Yesterday
Tuesday, September 16, 2025		 Black Light47
12V To 24V DC-DC Converter46
Of All Time 12VDC To 120VAC Inverter1,553,171
FM Transmitter1,025,781

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 233,691 61 *
Car Alarm Arming Horn Beep Canceller bob 142,501 6 *
Wireless Auto Tachometer 350,580 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,834 29 *
Parallel (Printer) Port Interface 295,759 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 456,313 63 *
3 Channel Spectrum Analyzer 230,529 20
40W Fluorescent Lamp Inverter Bart Milnes 337,243 60 *
Adjustable Strobe Light 317,858 36
Black Light 291,816 29
Colour (Sound) Organ 299,513 36
Electronic Dice NEW! 196,473 10 *
Fantastic Atom Expander 209,246 25
Flash Slave Trigger 228,949 18 *
Infa-Red Remote Control 647,070 216 *
IR Remote Extender NEW! 140,064 3 *
IR Remote Jammer Carl 274,700 110 *
IR Remote Switch NEW! 164,415 9 *
LASER Transmitter/Receiver 426,637 92
LED Chaser 455,711 83 *
LED Metronome NEW! 106,262 3 *
LED Thermometer 213,521 22 *
Light/Dark Detector 312,813 90 *
Simple Colour Organ 143,794 11 *
Strobe Light 282,730 27 *
TRIAC Light Dimmer 562,537 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 368,604 122 *
Electromagnetic Levitator NEW! 151,151 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 933,957 214 *
AC Motor Speed Controller 402,917 29 *
Air Flow Detector 258,928 54 *
Digital Keypad Combination Lock 208,734 20
Low Voltage Alarm 236,572 58 *
Pine Racecar Victory Judge 108,757 1 *
Pulse Width Modulation DC Motor Control 664,783 94
Rain Detector 312,450 112 *
Simple Lie Detector 574,064 323
Simple Polarity Tester Dudley LeRoux 172,383 13 *
Simple Servo Controller 229,341 22 *
Simple Touch Switch NEW! 177,410 6 *
Simple Two Speed Contactor DC Motor Controller 212,780 21 *
Stepper Motor Controller 762,242 120 *
Time Delay Relay 564,639 88
Time Delay Relay II jawaharlal@excite.com 254,988 39 *
Touch Switch 297,751 51 *
Video Activated Relay 128,315 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 189,218 10 *
Water Detector With Sump/Bilge Pump Controller 159,832 18 *
Wire Loop Alarm Alex Meaden 212,512 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 328,065 25 *
12VDC To 120VAC Inverter 1,553,171 691
6V to 12V Converter 538,178 121
Automatic 12V Lead Acid Battery Charger 948,168 248
Automatic Load Sensing Power Switch 174,901 16 *
Car Battery Charger 893,400 159 *
Dual Polarity Power Supply 380,204 84 *
Fixed Voltage Power Supply 319,566 52 *
High Current Power Supply 350,139 66 *
High Voltage High Current Power Supply 272,177 35 *
LASER Power Supply 305,000 28
Portable CD Player Adapter For Car 219,513 12 *
Power Supply 749,105 259 *
Solid State Tesla Coil NEW! 155,478 4
Solid State Tesla Coil/High Voltage Generator 455,768 51
Transformerless Power Supply 472,047 117 *
Voltage Inverter 351,703 51 *
Voltage Inverter II 211,426 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 594,263 182
3 Watt FM Transmitter Rae XL Tkacik 347,406 83 *
50 Watt Amplifier 518,394 74
8 Note Tune Player 147,586 12 *
8 Watt Audio Amp 384,325 67 *
Aircraft Radio Communications Receiver 289,319 50 *
Crystal Radio 168,002 53 *
Digital Volume Control 348,022 47 *
Electronic Stethoscope 331,059 142 *
FET Audio Mixer 352,498 41
FM Transmitter 1,025,781 420
Guitar Fuzz Effect 256,980 54 *
Microphone Mixer Anatoly I. Shikhatov 258,834 26 *
Mono To Stereo Synthesizer oRbEq 142,407 18 *
One Tube Regenerative Radio NEW! 157,798 4 *
Op Amp Radio 400,458 80 *
Single Chip AM Radio NEW! 107,307 4 *
Single Chip FM Radio NEW! 181,840 1 *
Sound Level Meter 350,647 51 *
Stereo Tube Amplifier Weslee Kinsler 276,871 15 *
Tone Control 318,749 31
Transistor Organ 208,447 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,084 27 *
FM Telephone Bug 241,680 57
Phone Busy Indicator 220,854 24 *
Remote Telephone Ringer 124,512 3 *
Ringing Phone Light Flasher 227,398 35 *
Simple Phone Tap Derek Tombrello 390,926 98 *
Telephone Hold Button 135,795 10
Telephone Recorder 223,569 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.