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, June 18, 2025		 12VDC To 120VAC Inverter7
High Voltage High Current Power Supply6
Yesterday
Tuesday, June 17, 2025		 12VDC To 120VAC Inverter50
Stepper Motor Controller40
Of All Time 12VDC To 120VAC Inverter1,549,007
FM Transmitter1,022,529

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 232,293 61 *
Car Alarm Arming Horn Beep Canceller bob 141,408 6 *
Wireless Auto Tachometer 349,135 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 164,756 29 *
Parallel (Printer) Port Interface 293,835 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 454,698 63 *
3 Channel Spectrum Analyzer 228,904 20
40W Fluorescent Lamp Inverter Bart Milnes 335,791 60 *
Adjustable Strobe Light 316,111 36
Black Light 289,985 29
Colour (Sound) Organ 297,617 36
Electronic Dice NEW! 195,008 10 *
Fantastic Atom Expander 208,061 25
Flash Slave Trigger 227,408 18 *
Infa-Red Remote Control 644,840 216 *
IR Remote Extender NEW! 138,627 3 *
IR Remote Jammer Carl 273,123 110 *
IR Remote Switch NEW! 162,965 9 *
LASER Transmitter/Receiver 424,782 92
LED Chaser 453,765 83 *
LED Metronome NEW! 104,906 3 *
LED Thermometer 212,256 22 *
Light/Dark Detector 311,494 90 *
Simple Colour Organ 142,508 11 *
Strobe Light 281,391 27 *
TRIAC Light Dimmer 560,824 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,003 122 *
Electromagnetic Levitator NEW! 149,861 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 931,795 214 *
AC Motor Speed Controller 400,603 29 *
Air Flow Detector 257,517 54 *
Digital Keypad Combination Lock 207,397 20
Low Voltage Alarm 235,007 58 *
Pine Racecar Victory Judge 107,614 1 *
Pulse Width Modulation DC Motor Control 662,700 94
Rain Detector 311,025 112 *
Simple Lie Detector 572,182 323
Simple Polarity Tester Dudley LeRoux 171,024 13 *
Simple Servo Controller 227,748 22 *
Simple Touch Switch NEW! 175,870 6 *
Simple Two Speed Contactor DC Motor Controller 211,284 21 *
Stepper Motor Controller 759,299 120 *
Time Delay Relay 562,897 88
Time Delay Relay II jawaharlal@excite.com 253,514 39 *
Touch Switch 296,132 51 *
Video Activated Relay 127,042 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 187,631 10 *
Water Detector With Sump/Bilge Pump Controller 158,566 18 *
Wire Loop Alarm Alex Meaden 211,158 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 325,671 25 *
12VDC To 120VAC Inverter 1,549,007 691
6V to 12V Converter 536,169 121
Automatic 12V Lead Acid Battery Charger 946,139 248
Automatic Load Sensing Power Switch 173,443 16 *
Car Battery Charger 891,364 159 *
Dual Polarity Power Supply 378,302 84 *
Fixed Voltage Power Supply 318,001 52 *
High Current Power Supply 348,059 66 *
High Voltage High Current Power Supply 270,580 35 *
LASER Power Supply 303,364 28
Portable CD Player Adapter For Car 218,094 12 *
Power Supply 747,337 259 *
Solid State Tesla Coil NEW! 153,606 4
Solid State Tesla Coil/High Voltage Generator 453,544 51
Transformerless Power Supply 470,424 117 *
Voltage Inverter 349,203 51 *
Voltage Inverter II 210,022 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 592,544 182
3 Watt FM Transmitter Rae XL Tkacik 344,771 83 *
50 Watt Amplifier 516,301 74
8 Note Tune Player 146,373 12 *
8 Watt Audio Amp 381,999 67 *
Aircraft Radio Communications Receiver 287,333 50 *
Crystal Radio 166,033 53 *
Digital Volume Control 346,272 47 *
Electronic Stethoscope 329,292 142 *
FET Audio Mixer 350,905 41
FM Transmitter 1,022,529 420
Guitar Fuzz Effect 255,159 54 *
Microphone Mixer Anatoly I. Shikhatov 257,327 26 *
Mono To Stereo Synthesizer oRbEq 140,873 18 *
One Tube Regenerative Radio NEW! 154,960 4 *
Op Amp Radio 398,432 80 *
Single Chip AM Radio NEW! 105,942 4 *
Single Chip FM Radio NEW! 180,042 1 *
Sound Level Meter 349,048 51 *
Stereo Tube Amplifier Weslee Kinsler 275,194 15 *
Tone Control 316,968 31
Transistor Organ 206,914 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 168,881 27 *
FM Telephone Bug 240,469 57
Phone Busy Indicator 219,544 24 *
Remote Telephone Ringer 123,349 3 *
Ringing Phone Light Flasher 225,577 35 *
Simple Phone Tap Derek Tombrello 389,495 98 *
Telephone Hold Button 134,489 10
Telephone Recorder 222,316 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.