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
Thursday, September 10, 2026		 Dual Polarity Power Supply25
Digital Volume Control17
Yesterday
Wednesday, September 09, 2026		 LED Chaser86
12VDC To 120VAC Inverter50
Of All Time 12VDC To 120VAC Inverter1,568,959
FM Transmitter1,038,235

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 238,730 61 *
Car Alarm Arming Horn Beep Canceller bob 147,253 6 *
Wireless Auto Tachometer 356,460 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 170,314 29 *
Parallel (Printer) Port Interface 303,063 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 463,109 63 *
3 Channel Spectrum Analyzer 236,861 20
40W Fluorescent Lamp Inverter Bart Milnes 342,762 60 *
Adjustable Strobe Light 324,011 36
Black Light 299,239 29
Colour (Sound) Organ 306,364 36
Electronic Dice NEW! 202,428 10 *
Fantastic Atom Expander 214,339 25
Flash Slave Trigger 235,076 18 *
Infa-Red Remote Control 654,483 216 *
IR Remote Extender NEW! 145,771 3 *
IR Remote Jammer Carl 281,153 110 *
IR Remote Switch NEW! 169,937 9 *
LASER Transmitter/Receiver 433,272 92
LED Chaser 463,401 83 *
LED Metronome NEW! 111,873 3 *
LED Thermometer 218,455 22 *
Light/Dark Detector 318,000 90 *
Simple Colour Organ 148,907 11 *
Strobe Light 288,016 27 *
TRIAC Light Dimmer 570,247 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 375,973 122 *
Electromagnetic Levitator NEW! 156,272 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 943,597 214 *
AC Motor Speed Controller 410,645 29 *
Air Flow Detector 264,572 54 *
Digital Keypad Combination Lock 213,996 20
Low Voltage Alarm 242,384 58 *
Pine Racecar Victory Judge 113,620 1 *
Pulse Width Modulation DC Motor Control 671,823 94
Rain Detector 318,420 112 *
Simple Lie Detector 580,804 323
Simple Polarity Tester Dudley LeRoux 178,335 13 *
Simple Servo Controller 235,274 22 *
Simple Touch Switch NEW! 183,356 6 *
Simple Two Speed Contactor DC Motor Controller 218,753 21 *
Stepper Motor Controller 771,851 120 *
Time Delay Relay 571,265 88
Time Delay Relay II jawaharlal@excite.com 260,835 39 *
Touch Switch 303,654 51 *
Video Activated Relay 133,311 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 196,799 10 *
Water Detector With Sump/Bilge Pump Controller 165,515 18 *
Wire Loop Alarm Alex Meaden 217,691 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 338,083 25 *
12VDC To 120VAC Inverter 1,568,959 691
6V to 12V Converter 545,911 121
Automatic 12V Lead Acid Battery Charger 956,857 248
Automatic Load Sensing Power Switch 180,644 16 *
Car Battery Charger 900,636 159 *
Dual Polarity Power Supply 387,151 84 *
Fixed Voltage Power Supply 324,715 52 *
High Current Power Supply 357,148 66 *
High Voltage High Current Power Supply 277,972 35 *
LASER Power Supply 310,891 28
Portable CD Player Adapter For Car 225,147 12 *
Power Supply 756,080 259 *
Solid State Tesla Coil NEW! 162,677 4
Solid State Tesla Coil/High Voltage Generator 464,617 51
Transformerless Power Supply 478,132 117 *
Voltage Inverter 359,665 51 *
Voltage Inverter II 217,113 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 600,084 182
3 Watt FM Transmitter Rae XL Tkacik 355,087 83 *
50 Watt Amplifier 524,926 74
8 Note Tune Player 152,554 12 *
8 Watt Audio Amp 392,053 67 *
Aircraft Radio Communications Receiver 296,232 50 *
Crystal Radio 175,348 53 *
Digital Volume Control 354,338 47 *
Electronic Stethoscope 338,124 142 *
FET Audio Mixer 358,206 41
FM Transmitter 1,038,235 420
Guitar Fuzz Effect 264,168 54 *
Microphone Mixer Anatoly I. Shikhatov 264,532 26 *
Mono To Stereo Synthesizer oRbEq 148,407 18 *
One Tube Regenerative Radio NEW! 166,617 4 *
Op Amp Radio 407,409 80 *
Single Chip AM Radio NEW! 112,948 4 *
Single Chip FM Radio NEW! 188,863 1 *
Sound Level Meter 356,777 51 *
Stereo Tube Amplifier Weslee Kinsler 283,421 15 *
Tone Control 325,222 31
Transistor Organ 214,564 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 174,822 27 *
FM Telephone Bug 246,364 57
Phone Busy Indicator 226,004 24 *
Remote Telephone Ringer 129,268 3 *
Ringing Phone Light Flasher 234,059 35 *
Simple Phone Tap Derek Tombrello 395,949 98 *
Telephone Hold Button 140,216 10
Telephone Recorder 228,385 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.