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, November 15, 2025		 Op Amp Radio12
Single Chip FM Radio12
Yesterday
Friday, November 14, 2025		 12VDC To 120VAC Inverter53
FM Transmitter51
Of All Time 12VDC To 120VAC Inverter1,556,062
FM Transmitter1,028,277

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,764 61 *
Car Alarm Arming Horn Beep Canceller bob 143,513 6 *
Wireless Auto Tachometer 351,862 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,734 29 *
Parallel (Printer) Port Interface 297,391 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 457,758 63 *
3 Channel Spectrum Analyzer 231,830 20
40W Fluorescent Lamp Inverter Bart Milnes 338,357 60 *
Adjustable Strobe Light 319,126 36
Black Light 293,470 29
Colour (Sound) Organ 300,869 36
Electronic Dice NEW! 197,777 10 *
Fantastic Atom Expander 210,312 25
Flash Slave Trigger 230,130 18 *
Infa-Red Remote Control 648,625 216 *
IR Remote Extender NEW! 141,253 3 *
IR Remote Jammer Carl 276,017 110 *
IR Remote Switch NEW! 165,573 9 *
LASER Transmitter/Receiver 428,004 92
LED Chaser 457,322 83 *
LED Metronome NEW! 107,409 3 *
LED Thermometer 214,565 22 *
Light/Dark Detector 313,945 90 *
Simple Colour Organ 144,908 11 *
Strobe Light 283,808 27 *
TRIAC Light Dimmer 563,986 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,082 122 *
Electromagnetic Levitator NEW! 152,215 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 935,815 214 *
AC Motor Speed Controller 404,673 29 *
Air Flow Detector 259,980 54 *
Digital Keypad Combination Lock 209,874 20
Low Voltage Alarm 237,793 58 *
Pine Racecar Victory Judge 109,808 1 *
Pulse Width Modulation DC Motor Control 666,249 94
Rain Detector 313,677 112 *
Simple Lie Detector 575,668 323
Simple Polarity Tester Dudley LeRoux 173,747 13 *
Simple Servo Controller 230,554 22 *
Simple Touch Switch NEW! 178,588 6 *
Simple Two Speed Contactor DC Motor Controller 214,050 21 *
Stepper Motor Controller 764,380 120 *
Time Delay Relay 565,932 88
Time Delay Relay II jawaharlal@excite.com 256,299 39 *
Touch Switch 298,950 51 *
Video Activated Relay 129,406 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 190,643 10 *
Water Detector With Sump/Bilge Pump Controller 161,005 18 *
Wire Loop Alarm Alex Meaden 213,563 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 330,497 25 *
12VDC To 120VAC Inverter 1,556,062 691
6V to 12V Converter 539,686 121
Automatic 12V Lead Acid Battery Charger 949,708 248
Automatic Load Sensing Power Switch 176,085 16 *
Car Battery Charger 894,953 159 *
Dual Polarity Power Supply 381,737 84 *
Fixed Voltage Power Supply 320,688 52 *
High Current Power Supply 351,718 66 *
High Voltage High Current Power Supply 273,421 35 *
LASER Power Supply 306,214 28
Portable CD Player Adapter For Car 220,670 12 *
Power Supply 750,457 259 *
Solid State Tesla Coil NEW! 156,930 4
Solid State Tesla Coil/High Voltage Generator 457,430 51
Transformerless Power Supply 473,483 117 *
Voltage Inverter 353,526 51 *
Voltage Inverter II 212,636 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 595,488 182
3 Watt FM Transmitter Rae XL Tkacik 349,011 83 *
50 Watt Amplifier 519,843 74
8 Note Tune Player 148,666 12 *
8 Watt Audio Amp 385,960 67 *
Aircraft Radio Communications Receiver 290,710 50 *
Crystal Radio 169,578 53 *
Digital Volume Control 349,415 47 *
Electronic Stethoscope 332,498 142 *
FET Audio Mixer 353,679 41
FM Transmitter 1,028,277 420
Guitar Fuzz Effect 258,596 54 *
Microphone Mixer Anatoly I. Shikhatov 260,090 26 *
Mono To Stereo Synthesizer oRbEq 143,727 18 *
One Tube Regenerative Radio NEW! 159,865 4 *
Op Amp Radio 401,933 80 *
Single Chip AM Radio NEW! 108,410 4 *
Single Chip FM Radio NEW! 183,348 1 *
Sound Level Meter 351,972 51 *
Stereo Tube Amplifier Weslee Kinsler 278,377 15 *
Tone Control 320,164 31
Transistor Organ 209,734 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,089 27 *
FM Telephone Bug 242,548 57
Phone Busy Indicator 221,816 24 *
Remote Telephone Ringer 125,330 3 *
Ringing Phone Light Flasher 228,660 35 *
Simple Phone Tap Derek Tombrello 391,860 98 *
Telephone Hold Button 136,586 10
Telephone Recorder 224,435 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.