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, July 29, 2026		 12VDC To 120VAC Inverter29
8 Watt Audio Amp16
Yesterday
Tuesday, July 28, 2026		 7 Segment LED Counter42
Adjustable Strobe Light37
Of All Time 12VDC To 120VAC Inverter1,566,989
FM Transmitter1,036,888

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 238,082 61 *
Car Alarm Arming Horn Beep Canceller bob 146,625 6 *
Wireless Auto Tachometer 355,702 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 169,674 29 *
Parallel (Printer) Port Interface 302,011 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 462,227 63 *
3 Channel Spectrum Analyzer 235,966 20
40W Fluorescent Lamp Inverter Bart Milnes 342,024 60 *
Adjustable Strobe Light 323,153 36
Black Light 298,313 29
Colour (Sound) Organ 305,433 36
Electronic Dice NEW! 201,646 10 *
Fantastic Atom Expander 213,627 25
Flash Slave Trigger 234,175 18 *
Infa-Red Remote Control 653,419 216 *
IR Remote Extender NEW! 144,925 3 *
IR Remote Jammer Carl 280,329 110 *
IR Remote Switch NEW! 169,196 9 *
LASER Transmitter/Receiver 432,464 92
LED Chaser 462,375 83 *
LED Metronome NEW! 111,110 3 *
LED Thermometer 217,755 22 *
Light/Dark Detector 317,264 90 *
Simple Colour Organ 148,135 11 *
Strobe Light 287,234 27 *
TRIAC Light Dimmer 569,320 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 375,062 122 *
Electromagnetic Levitator NEW! 155,650 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 942,370 214 *
AC Motor Speed Controller 409,682 29 *
Air Flow Detector 263,789 54 *
Digital Keypad Combination Lock 213,321 20
Low Voltage Alarm 241,640 58 *
Pine Racecar Victory Judge 112,904 1 *
Pulse Width Modulation DC Motor Control 670,842 94
Rain Detector 317,659 112 *
Simple Lie Detector 580,016 323
Simple Polarity Tester Dudley LeRoux 177,565 13 *
Simple Servo Controller 234,398 22 *
Simple Touch Switch NEW! 182,609 6 *
Simple Two Speed Contactor DC Motor Controller 217,989 21 *
Stepper Motor Controller 770,522 120 *
Time Delay Relay 570,233 88
Time Delay Relay II jawaharlal@excite.com 260,040 39 *
Touch Switch 302,844 51 *
Video Activated Relay 132,534 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 195,889 10 *
Water Detector With Sump/Bilge Pump Controller 164,816 18 *
Wire Loop Alarm Alex Meaden 216,928 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 336,769 25 *
12VDC To 120VAC Inverter 1,566,989 691
6V to 12V Converter 544,957 121
Automatic 12V Lead Acid Battery Charger 955,804 248
Automatic Load Sensing Power Switch 179,848 16 *
Car Battery Charger 899,766 159 *
Dual Polarity Power Supply 386,402 84 *
Fixed Voltage Power Supply 324,205 52 *
High Current Power Supply 356,486 66 *
High Voltage High Current Power Supply 277,490 35 *
LASER Power Supply 310,312 28
Portable CD Player Adapter For Car 224,600 12 *
Power Supply 755,368 259 *
Solid State Tesla Coil NEW! 161,945 4
Solid State Tesla Coil/High Voltage Generator 463,633 51
Transformerless Power Supply 477,583 117 *
Voltage Inverter 358,886 51 *
Voltage Inverter II 216,568 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 599,545 182
3 Watt FM Transmitter Rae XL Tkacik 354,350 83 *
50 Watt Amplifier 524,269 74
8 Note Tune Player 152,023 12 *
8 Watt Audio Amp 391,300 67 *
Aircraft Radio Communications Receiver 295,504 50 *
Crystal Radio 174,681 53 *
Digital Volume Control 353,695 47 *
Electronic Stethoscope 337,286 142 *
FET Audio Mixer 357,624 41
FM Transmitter 1,036,888 420
Guitar Fuzz Effect 263,514 54 *
Microphone Mixer Anatoly I. Shikhatov 263,969 26 *
Mono To Stereo Synthesizer oRbEq 147,870 18 *
One Tube Regenerative Radio NEW! 165,808 4 *
Op Amp Radio 406,686 80 *
Single Chip AM Radio NEW! 112,355 4 *
Single Chip FM Radio NEW! 187,988 1 *
Sound Level Meter 356,198 51 *
Stereo Tube Amplifier Weslee Kinsler 282,908 15 *
Tone Control 324,530 31
Transistor Organ 213,944 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 174,338 27 *
FM Telephone Bug 245,863 57
Phone Busy Indicator 225,468 24 *
Remote Telephone Ringer 128,813 3 *
Ringing Phone Light Flasher 233,431 35 *
Simple Phone Tap Derek Tombrello 395,431 98 *
Telephone Hold Button 139,780 10
Telephone Recorder 227,770 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.