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
Thursday, August 14, 2025		 Touch Switch6
IR Remote Jammer6
Yesterday
Wednesday, August 13, 2025		 12VDC To 120VAC Inverter41
One Tube Regenerative Radio33
Of All Time 12VDC To 120VAC Inverter1,551,546
FM Transmitter1,024,467

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 233,079 61 *
Car Alarm Arming Horn Beep Canceller bob 141,991 6 *
Wireless Auto Tachometer 349,922 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 165,359 29 *
Parallel (Printer) Port Interface 294,891 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 455,522 63 *
3 Channel Spectrum Analyzer 229,779 20
40W Fluorescent Lamp Inverter Bart Milnes 336,564 60 *
Adjustable Strobe Light 317,077 36
Black Light 290,971 29
Colour (Sound) Organ 298,614 36
Electronic Dice NEW! 195,810 10 *
Fantastic Atom Expander 208,641 25
Flash Slave Trigger 228,227 18 *
Infa-Red Remote Control 646,205 216 *
IR Remote Extender NEW! 139,402 3 *
IR Remote Jammer Carl 273,975 110 *
IR Remote Switch NEW! 163,792 9 *
LASER Transmitter/Receiver 425,852 92
LED Chaser 454,819 83 *
LED Metronome NEW! 105,665 3 *
LED Thermometer 212,911 22 *
Light/Dark Detector 312,150 90 *
Simple Colour Organ 143,212 11 *
Strobe Light 282,029 27 *
TRIAC Light Dimmer 561,721 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 367,839 122 *
Electromagnetic Levitator NEW! 150,555 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 932,967 214 *
AC Motor Speed Controller 401,841 29 *
Air Flow Detector 258,302 54 *
Digital Keypad Combination Lock 208,117 20
Low Voltage Alarm 235,877 58 *
Pine Racecar Victory Judge 108,209 1 *
Pulse Width Modulation DC Motor Control 663,811 94
Rain Detector 311,809 112 *
Simple Lie Detector 573,290 323
Simple Polarity Tester Dudley LeRoux 171,757 13 *
Simple Servo Controller 228,621 22 *
Simple Touch Switch NEW! 176,691 6 *
Simple Two Speed Contactor DC Motor Controller 212,129 21 *
Stepper Motor Controller 760,919 120 *
Time Delay Relay 563,885 88
Time Delay Relay II jawaharlal@excite.com 254,308 39 *
Touch Switch 297,073 51 *
Video Activated Relay 127,716 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 188,507 10 *
Water Detector With Sump/Bilge Pump Controller 159,269 18 *
Wire Loop Alarm Alex Meaden 211,910 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 326,948 25 *
12VDC To 120VAC Inverter 1,551,546 691
6V to 12V Converter 537,339 121
Automatic 12V Lead Acid Battery Charger 947,299 248
Automatic Load Sensing Power Switch 174,229 16 *
Car Battery Charger 892,580 159 *
Dual Polarity Power Supply 379,399 84 *
Fixed Voltage Power Supply 318,876 52 *
High Current Power Supply 349,123 66 *
High Voltage High Current Power Supply 271,520 35 *
LASER Power Supply 304,305 28
Portable CD Player Adapter For Car 218,886 12 *
Power Supply 748,271 259 *
Solid State Tesla Coil NEW! 154,694 4
Solid State Tesla Coil/High Voltage Generator 454,808 51
Transformerless Power Supply 471,361 117 *
Voltage Inverter 350,685 51 *
Voltage Inverter II 210,831 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 593,545 182
3 Watt FM Transmitter Rae XL Tkacik 346,373 83 *
50 Watt Amplifier 517,570 74
8 Note Tune Player 147,048 12 *
8 Watt Audio Amp 383,275 67 *
Aircraft Radio Communications Receiver 288,399 50 *
Crystal Radio 167,074 53 *
Digital Volume Control 347,322 47 *
Electronic Stethoscope 330,253 142 *
FET Audio Mixer 351,756 41
FM Transmitter 1,024,467 420
Guitar Fuzz Effect 256,146 54 *
Microphone Mixer Anatoly I. Shikhatov 258,162 26 *
Mono To Stereo Synthesizer oRbEq 141,743 18 *
One Tube Regenerative Radio NEW! 156,615 4 *
Op Amp Radio 399,615 80 *
Single Chip AM Radio NEW! 106,690 4 *
Single Chip FM Radio NEW! 181,088 1 *
Sound Level Meter 349,939 51 *
Stereo Tube Amplifier Weslee Kinsler 276,056 15 *
Tone Control 317,966 31
Transistor Organ 207,813 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 169,522 27 *
FM Telephone Bug 241,058 57
Phone Busy Indicator 220,262 24 *
Remote Telephone Ringer 124,002 3 *
Ringing Phone Light Flasher 226,489 35 *
Simple Phone Tap Derek Tombrello 390,248 98 *
Telephone Hold Button 135,200 10
Telephone Recorder 222,937 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.