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
Saturday, October 24, 2026		 12VDC To 120VAC Inverter28
FET Audio Mixer28
Yesterday
Friday, October 23, 2026		 12VDC To 120VAC Inverter49
FM Transmitter47
Of All Time 12VDC To 120VAC Inverter1,570,592
FM Transmitter1,039,493

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 239,300 61 *
Car Alarm Arming Horn Beep Canceller bob 147,744 6 *
Wireless Auto Tachometer 357,107 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 170,904 29 *
Parallel (Printer) Port Interface 303,934 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 463,920 63 *
3 Channel Spectrum Analyzer 237,663 20
40W Fluorescent Lamp Inverter Bart Milnes 343,392 60 *
Adjustable Strobe Light 324,816 36
Black Light 300,151 29
Colour (Sound) Organ 307,250 36
Electronic Dice NEW! 203,161 10 *
Fantastic Atom Expander 215,019 25
Flash Slave Trigger 235,907 18 *
Infa-Red Remote Control 655,402 216 *
IR Remote Extender NEW! 146,530 3 *
IR Remote Jammer Carl 281,830 110 *
IR Remote Switch NEW! 170,680 9 *
LASER Transmitter/Receiver 433,997 92
LED Chaser 464,209 83 *
LED Metronome NEW! 112,512 3 *
LED Thermometer 219,044 22 *
Light/Dark Detector 318,659 90 *
Simple Colour Organ 149,593 11 *
Strobe Light 288,764 27 *
TRIAC Light Dimmer 571,095 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 376,817 122 *
Electromagnetic Levitator NEW! 156,889 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 944,565 214 *
AC Motor Speed Controller 411,397 29 *
Air Flow Detector 265,197 54 *
Digital Keypad Combination Lock 214,592 20
Low Voltage Alarm 243,053 58 *
Pine Racecar Victory Judge 114,293 1 *
Pulse Width Modulation DC Motor Control 672,712 94
Rain Detector 319,098 112 *
Simple Lie Detector 581,547 323
Simple Polarity Tester Dudley LeRoux 179,013 13 *
Simple Servo Controller 236,010 22 *
Simple Touch Switch NEW! 184,054 6 *
Simple Two Speed Contactor DC Motor Controller 219,468 21 *
Stepper Motor Controller 772,836 120 *
Time Delay Relay 572,069 88
Time Delay Relay II jawaharlal@excite.com 261,438 39 *
Touch Switch 304,422 51 *
Video Activated Relay 134,048 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 197,675 10 *
Water Detector With Sump/Bilge Pump Controller 166,093 18 *
Wire Loop Alarm Alex Meaden 218,402 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 338,996 25 *
12VDC To 120VAC Inverter 1,570,592 691
6V to 12V Converter 546,753 121
Automatic 12V Lead Acid Battery Charger 957,804 248
Automatic Load Sensing Power Switch 181,304 16 *
Car Battery Charger 901,419 159 *
Dual Polarity Power Supply 387,871 84 *
Fixed Voltage Power Supply 325,327 52 *
High Current Power Supply 357,887 66 *
High Voltage High Current Power Supply 278,538 35 *
LASER Power Supply 311,644 28
Portable CD Player Adapter For Car 225,837 12 *
Power Supply 756,899 259 *
Solid State Tesla Coil NEW! 163,483 4
Solid State Tesla Coil/High Voltage Generator 465,530 51
Transformerless Power Supply 478,797 117 *
Voltage Inverter 360,602 51 *
Voltage Inverter II 217,788 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 600,721 182
3 Watt FM Transmitter Rae XL Tkacik 355,896 83 *
50 Watt Amplifier 525,684 74
8 Note Tune Player 153,183 12 *
8 Watt Audio Amp 392,878 67 *
Aircraft Radio Communications Receiver 297,010 50 *
Crystal Radio 176,038 53 *
Digital Volume Control 355,106 47 *
Electronic Stethoscope 338,896 142 *
FET Audio Mixer 358,928 41
FM Transmitter 1,039,493 420
Guitar Fuzz Effect 264,979 54 *
Microphone Mixer Anatoly I. Shikhatov 265,212 26 *
Mono To Stereo Synthesizer oRbEq 149,156 18 *
One Tube Regenerative Radio NEW! 167,661 4 *
Op Amp Radio 408,303 80 *
Single Chip AM Radio NEW! 113,603 4 *
Single Chip FM Radio NEW! 189,788 1 *
Sound Level Meter 357,553 51 *
Stereo Tube Amplifier Weslee Kinsler 284,064 15 *
Tone Control 325,940 31
Transistor Organ 215,589 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 175,396 27 *
FM Telephone Bug 247,005 57
Phone Busy Indicator 226,680 24 *
Remote Telephone Ringer 129,845 3 *
Ringing Phone Light Flasher 234,722 35 *
Simple Phone Tap Derek Tombrello 396,577 98 *
Telephone Hold Button 140,770 10
Telephone Recorder 229,075 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.