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		 FM Transmitter47
12VDC To 120VAC Inverter47
Yesterday
Friday, November 14, 2025		 12VDC To 120VAC Inverter53
FM Transmitter51
Of All Time 12VDC To 120VAC Inverter1,556,106
FM Transmitter1,028,313

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,774 61 *
Car Alarm Arming Horn Beep Canceller bob 143,525 6 *
Wireless Auto Tachometer 351,872 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,748 29 *
Parallel (Printer) Port Interface 297,404 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 457,775 63 *
3 Channel Spectrum Analyzer 231,848 20
40W Fluorescent Lamp Inverter Bart Milnes 338,379 60 *
Adjustable Strobe Light 319,138 36
Black Light 293,493 29
Colour (Sound) Organ 300,881 36
Electronic Dice NEW! 197,791 10 *
Fantastic Atom Expander 210,324 25
Flash Slave Trigger 230,144 18 *
Infa-Red Remote Control 648,642 216 *
IR Remote Extender NEW! 141,266 3 *
IR Remote Jammer Carl 276,034 110 *
IR Remote Switch NEW! 165,590 9 *
LASER Transmitter/Receiver 428,024 92
LED Chaser 457,339 83 *
LED Metronome NEW! 107,423 3 *
LED Thermometer 214,573 22 *
Light/Dark Detector 313,950 90 *
Simple Colour Organ 144,919 11 *
Strobe Light 283,819 27 *
TRIAC Light Dimmer 564,000 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 370,096 122 *
Electromagnetic Levitator NEW! 152,224 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 935,839 214 *
AC Motor Speed Controller 404,690 29 *
Air Flow Detector 259,996 54 *
Digital Keypad Combination Lock 209,881 20
Low Voltage Alarm 237,807 58 *
Pine Racecar Victory Judge 109,816 1 *
Pulse Width Modulation DC Motor Control 666,265 94
Rain Detector 313,689 112 *
Simple Lie Detector 575,685 323
Simple Polarity Tester Dudley LeRoux 173,761 13 *
Simple Servo Controller 230,568 22 *
Simple Touch Switch NEW! 178,601 6 *
Simple Two Speed Contactor DC Motor Controller 214,057 21 *
Stepper Motor Controller 764,396 120 *
Time Delay Relay 565,942 88
Time Delay Relay II jawaharlal@excite.com 256,312 39 *
Touch Switch 298,958 51 *
Video Activated Relay 129,416 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 190,655 10 *
Water Detector With Sump/Bilge Pump Controller 161,017 18 *
Wire Loop Alarm Alex Meaden 213,575 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 330,529 25 *
12VDC To 120VAC Inverter 1,556,106 691
6V to 12V Converter 539,706 121
Automatic 12V Lead Acid Battery Charger 949,728 248
Automatic Load Sensing Power Switch 176,102 16 *
Car Battery Charger 894,970 159 *
Dual Polarity Power Supply 381,764 84 *
Fixed Voltage Power Supply 320,705 52 *
High Current Power Supply 351,740 66 *
High Voltage High Current Power Supply 273,433 35 *
LASER Power Supply 306,226 28
Portable CD Player Adapter For Car 220,680 12 *
Power Supply 750,475 259 *
Solid State Tesla Coil NEW! 156,948 4
Solid State Tesla Coil/High Voltage Generator 457,443 51
Transformerless Power Supply 473,507 117 *
Voltage Inverter 353,548 51 *
Voltage Inverter II 212,653 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 595,501 182
3 Watt FM Transmitter Rae XL Tkacik 349,030 83 *
50 Watt Amplifier 519,855 74
8 Note Tune Player 148,675 12 *
8 Watt Audio Amp 385,976 67 *
Aircraft Radio Communications Receiver 290,728 50 *
Crystal Radio 169,596 53 *
Digital Volume Control 349,434 47 *
Electronic Stethoscope 332,515 142 *
FET Audio Mixer 353,688 41
FM Transmitter 1,028,313 420
Guitar Fuzz Effect 258,614 54 *
Microphone Mixer Anatoly I. Shikhatov 260,102 26 *
Mono To Stereo Synthesizer oRbEq 143,741 18 *
One Tube Regenerative Radio NEW! 159,887 4 *
Op Amp Radio 401,946 80 *
Single Chip AM Radio NEW! 108,433 4 *
Single Chip FM Radio NEW! 183,374 1 *
Sound Level Meter 351,985 51 *
Stereo Tube Amplifier Weslee Kinsler 278,397 15 *
Tone Control 320,186 31
Transistor Organ 209,742 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 171,093 27 *
FM Telephone Bug 242,554 57
Phone Busy Indicator 221,822 24 *
Remote Telephone Ringer 125,342 3 *
Ringing Phone Light Flasher 228,677 35 *
Simple Phone Tap Derek Tombrello 391,867 98 *
Telephone Hold Button 136,595 10
Telephone Recorder 224,444 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.