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
Sunday, January 11, 2026		 Transformerless Power Supply8
Portable CD Player Adapter For Car6
Yesterday
Saturday, January 10, 2026		 12VDC To 120VAC Inverter60
Voltage Inverter37
Of All Time 12VDC To 120VAC Inverter1,558,670
FM Transmitter1,030,243

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 235,533 61 *
Car Alarm Arming Horn Beep Canceller bob 144,270 6 *
Wireless Auto Tachometer 352,772 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 167,357 29 *
Parallel (Printer) Port Interface 298,513 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 458,691 63 *
3 Channel Spectrum Analyzer 232,787 20
40W Fluorescent Lamp Inverter Bart Milnes 339,265 60 *
Adjustable Strobe Light 320,038 36
Black Light 294,571 29
Colour (Sound) Organ 301,973 36
Electronic Dice NEW! 198,666 10 *
Fantastic Atom Expander 211,080 25
Flash Slave Trigger 231,081 18 *
Infa-Red Remote Control 649,675 216 *
IR Remote Extender NEW! 142,143 3 *
IR Remote Jammer Carl 276,994 110 *
IR Remote Switch NEW! 166,492 9 *
LASER Transmitter/Receiver 429,008 92
LED Chaser 458,582 83 *
LED Metronome NEW! 108,254 3 *
LED Thermometer 215,270 22 *
Light/Dark Detector 314,716 90 *
Simple Colour Organ 145,669 11 *
Strobe Light 284,603 27 *
TRIAC Light Dimmer 565,039 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 371,025 122 *
Electromagnetic Levitator NEW! 153,006 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 937,671 214 *
AC Motor Speed Controller 406,023 29 *
Air Flow Detector 260,865 54 *
Digital Keypad Combination Lock 210,715 20
Low Voltage Alarm 238,778 58 *
Pine Racecar Victory Judge 110,513 1 *
Pulse Width Modulation DC Motor Control 667,335 94
Rain Detector 314,600 112 *
Simple Lie Detector 576,753 323
Simple Polarity Tester Dudley LeRoux 174,696 13 *
Simple Servo Controller 231,496 22 *
Simple Touch Switch NEW! 179,614 6 *
Simple Two Speed Contactor DC Motor Controller 214,937 21 *
Stepper Motor Controller 765,881 120 *
Time Delay Relay 566,967 88
Time Delay Relay II jawaharlal@excite.com 257,260 39 *
Touch Switch 299,872 51 *
Video Activated Relay 130,136 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 191,825 10 *
Water Detector With Sump/Bilge Pump Controller 161,976 18 *
Wire Loop Alarm Alex Meaden 214,328 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 332,060 25 *
12VDC To 120VAC Inverter 1,558,670 691
6V to 12V Converter 540,947 121
Automatic 12V Lead Acid Battery Charger 951,140 248
Automatic Load Sensing Power Switch 176,978 16 *
Car Battery Charger 896,147 159 *
Dual Polarity Power Supply 382,999 84 *
Fixed Voltage Power Supply 321,552 52 *
High Current Power Supply 352,975 66 *
High Voltage High Current Power Supply 274,401 35 *
LASER Power Supply 307,092 28
Portable CD Player Adapter For Car 221,643 12 *
Power Supply 751,554 259 *
Solid State Tesla Coil NEW! 158,247 4
Solid State Tesla Coil/High Voltage Generator 458,842 51
Transformerless Power Supply 474,541 117 *
Voltage Inverter 354,877 51 *
Voltage Inverter II 213,580 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 596,497 182
3 Watt FM Transmitter Rae XL Tkacik 350,353 83 *
50 Watt Amplifier 520,935 74
8 Note Tune Player 149,490 12 *
8 Watt Audio Amp 387,163 67 *
Aircraft Radio Communications Receiver 291,864 50 *
Crystal Radio 170,845 53 *
Digital Volume Control 350,528 47 *
Electronic Stethoscope 333,527 142 *
FET Audio Mixer 354,565 41
FM Transmitter 1,030,243 420
Guitar Fuzz Effect 259,784 54 *
Microphone Mixer Anatoly I. Shikhatov 260,991 26 *
Mono To Stereo Synthesizer oRbEq 144,686 18 *
One Tube Regenerative Radio NEW! 161,418 4 *
Op Amp Radio 403,012 80 *
Single Chip AM Radio NEW! 109,320 4 *
Single Chip FM Radio NEW! 184,547 1 *
Sound Level Meter 352,950 51 *
Stereo Tube Amplifier Weslee Kinsler 279,624 15 *
Tone Control 321,274 31
Transistor Organ 210,686 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,844 27 *
FM Telephone Bug 243,232 57
Phone Busy Indicator 222,587 24 *
Remote Telephone Ringer 126,237 3 *
Ringing Phone Light Flasher 229,730 35 *
Simple Phone Tap Derek Tombrello 392,679 98 *
Telephone Hold Button 137,301 10
Telephone Recorder 225,183 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.