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, February 20, 2026		 FM Transmitter31
12VDC To 120VAC Inverter24
Yesterday
Thursday, February 19, 2026		 12VDC To 120VAC Inverter41
Stepper Motor Controller33
Of All Time 12VDC To 120VAC Inverter1,560,576
FM Transmitter1,031,685

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 236,122 61 *
Car Alarm Arming Horn Beep Canceller bob 144,796 6 *
Wireless Auto Tachometer 353,471 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,830 29 *
Parallel (Printer) Port Interface 299,242 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 459,441 63 *
3 Channel Spectrum Analyzer 233,457 20
40W Fluorescent Lamp Inverter Bart Milnes 339,961 60 *
Adjustable Strobe Light 320,676 36
Black Light 295,403 29
Colour (Sound) Organ 302,742 36
Electronic Dice NEW! 199,269 10 *
Fantastic Atom Expander 211,626 25
Flash Slave Trigger 231,781 18 *
Infa-Red Remote Control 650,413 216 *
IR Remote Extender NEW! 142,797 3 *
IR Remote Jammer Carl 277,596 110 *
IR Remote Switch NEW! 167,104 9 *
LASER Transmitter/Receiver 429,798 92
LED Chaser 459,399 83 *
LED Metronome NEW! 108,829 3 *
LED Thermometer 215,803 22 *
Light/Dark Detector 315,265 90 *
Simple Colour Organ 146,191 11 *
Strobe Light 285,158 27 *
TRIAC Light Dimmer 565,893 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 371,758 122 *
Electromagnetic Levitator NEW! 153,577 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 938,660 214 *
AC Motor Speed Controller 406,853 29 *
Air Flow Detector 261,467 54 *
Digital Keypad Combination Lock 211,273 20
Low Voltage Alarm 239,403 58 *
Pine Racecar Victory Judge 111,022 1 *
Pulse Width Modulation DC Motor Control 668,183 94
Rain Detector 315,216 112 *
Simple Lie Detector 577,523 323
Simple Polarity Tester Dudley LeRoux 175,342 13 *
Simple Servo Controller 232,156 22 *
Simple Touch Switch NEW! 180,328 6 *
Simple Two Speed Contactor DC Motor Controller 215,540 21 *
Stepper Motor Controller 766,953 120 *
Time Delay Relay 567,662 88
Time Delay Relay II jawaharlal@excite.com 257,867 39 *
Touch Switch 300,517 51 *
Video Activated Relay 130,630 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 192,632 10 *
Water Detector With Sump/Bilge Pump Controller 162,639 18 *
Wire Loop Alarm Alex Meaden 214,852 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 333,278 25 *
12VDC To 120VAC Inverter 1,560,576 691
6V to 12V Converter 541,771 121
Automatic 12V Lead Acid Battery Charger 952,152 248
Automatic Load Sensing Power Switch 177,596 16 *
Car Battery Charger 896,980 159 *
Dual Polarity Power Supply 383,765 84 *
Fixed Voltage Power Supply 322,162 52 *
High Current Power Supply 353,756 66 *
High Voltage High Current Power Supply 275,138 35 *
LASER Power Supply 307,759 28
Portable CD Player Adapter For Car 222,255 12 *
Power Supply 752,362 259 *
Solid State Tesla Coil NEW! 159,150 4
Solid State Tesla Coil/High Voltage Generator 459,778 51
Transformerless Power Supply 475,243 117 *
Voltage Inverter 355,750 51 *
Voltage Inverter II 214,215 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 597,237 182
3 Watt FM Transmitter Rae XL Tkacik 351,195 83 *
50 Watt Amplifier 521,720 74
8 Note Tune Player 150,045 12 *
8 Watt Audio Amp 388,064 67 *
Aircraft Radio Communications Receiver 292,647 50 *
Crystal Radio 171,744 53 *
Digital Volume Control 351,275 47 *
Electronic Stethoscope 334,225 142 *
FET Audio Mixer 355,223 41
FM Transmitter 1,031,685 420
Guitar Fuzz Effect 260,583 54 *
Microphone Mixer Anatoly I. Shikhatov 261,663 26 *
Mono To Stereo Synthesizer oRbEq 145,376 18 *
One Tube Regenerative Radio NEW! 162,446 4 *
Op Amp Radio 403,822 80 *
Single Chip AM Radio NEW! 110,008 4 *
Single Chip FM Radio NEW! 185,296 1 *
Sound Level Meter 353,649 51 *
Stereo Tube Amplifier Weslee Kinsler 280,461 15 *
Tone Control 322,053 31
Transistor Organ 211,384 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 172,351 27 *
FM Telephone Bug 243,781 57
Phone Busy Indicator 223,199 24 *
Remote Telephone Ringer 126,846 3 *
Ringing Phone Light Flasher 230,605 35 *
Simple Phone Tap Derek Tombrello 393,387 98 *
Telephone Hold Button 137,892 10
Telephone Recorder 225,763 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.