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, November 06, 2025		 FM Transmitter45
Video Stabilizer/MacroVision Removal45
Yesterday
Wednesday, November 05, 2025		 12VDC To 120VAC Inverter59
12V To 24V DC-DC Converter46
Of All Time 12VDC To 120VAC Inverter1,555,661
FM Transmitter1,027,881

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 234,623 61 *
Car Alarm Arming Horn Beep Canceller bob 143,364 6 *
Wireless Auto Tachometer 351,687 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 166,623 29 *
Parallel (Printer) Port Interface 297,179 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 457,519 63 *
3 Channel Spectrum Analyzer 231,636 20
40W Fluorescent Lamp Inverter Bart Milnes 338,184 60 *
Adjustable Strobe Light 318,962 36
Black Light 293,230 29
Colour (Sound) Organ 300,704 36
Electronic Dice NEW! 197,592 10 *
Fantastic Atom Expander 210,133 25
Flash Slave Trigger 229,958 18 *
Infa-Red Remote Control 648,341 216 *
IR Remote Extender NEW! 141,073 3 *
IR Remote Jammer Carl 275,840 110 *
IR Remote Switch NEW! 165,397 9 *
LASER Transmitter/Receiver 427,816 92
LED Chaser 457,155 83 *
LED Metronome NEW! 107,255 3 *
LED Thermometer 214,410 22 *
Light/Dark Detector 313,772 90 *
Simple Colour Organ 144,734 11 *
Strobe Light 283,668 27 *
TRIAC Light Dimmer 563,763 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 369,884 122 *
Electromagnetic Levitator NEW! 152,068 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 935,515 214 *
AC Motor Speed Controller 404,480 29 *
Air Flow Detector 259,832 54 *
Digital Keypad Combination Lock 209,717 20
Low Voltage Alarm 237,612 58 *
Pine Racecar Victory Judge 109,670 1 *
Pulse Width Modulation DC Motor Control 666,015 94
Rain Detector 313,473 112 *
Simple Lie Detector 575,468 323
Simple Polarity Tester Dudley LeRoux 173,498 13 *
Simple Servo Controller 230,408 22 *
Simple Touch Switch NEW! 178,442 6 *
Simple Two Speed Contactor DC Motor Controller 213,851 21 *
Stepper Motor Controller 764,050 120 *
Time Delay Relay 565,787 88
Time Delay Relay II jawaharlal@excite.com 256,063 39 *
Touch Switch 298,774 51 *
Video Activated Relay 129,213 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 190,381 10 *
Water Detector With Sump/Bilge Pump Controller 160,818 18 *
Wire Loop Alarm Alex Meaden 213,444 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 330,175 25 *
12VDC To 120VAC Inverter 1,555,661 691
6V to 12V Converter 539,474 121
Automatic 12V Lead Acid Battery Charger 949,506 248
Automatic Load Sensing Power Switch 175,910 16 *
Car Battery Charger 894,782 159 *
Dual Polarity Power Supply 381,480 84 *
Fixed Voltage Power Supply 320,510 52 *
High Current Power Supply 351,467 66 *
High Voltage High Current Power Supply 273,260 35 *
LASER Power Supply 306,027 28
Portable CD Player Adapter For Car 220,469 12 *
Power Supply 750,288 259 *
Solid State Tesla Coil NEW! 156,732 4
Solid State Tesla Coil/High Voltage Generator 457,173 51
Transformerless Power Supply 473,231 117 *
Voltage Inverter 353,260 51 *
Voltage Inverter II 212,459 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 595,330 182
3 Watt FM Transmitter Rae XL Tkacik 348,812 83 *
50 Watt Amplifier 519,641 74
8 Note Tune Player 148,471 12 *
8 Watt Audio Amp 385,781 67 *
Aircraft Radio Communications Receiver 290,482 50 *
Crystal Radio 169,358 53 *
Digital Volume Control 349,183 47 *
Electronic Stethoscope 332,305 142 *
FET Audio Mixer 353,506 41
FM Transmitter 1,027,881 420
Guitar Fuzz Effect 258,319 54 *
Microphone Mixer Anatoly I. Shikhatov 259,924 26 *
Mono To Stereo Synthesizer oRbEq 143,500 18 *
One Tube Regenerative Radio NEW! 159,564 4 *
Op Amp Radio 401,742 80 *
Single Chip AM Radio NEW! 108,265 4 *
Single Chip FM Radio NEW! 183,148 1 *
Sound Level Meter 351,800 51 *
Stereo Tube Amplifier Weslee Kinsler 278,176 15 *
Tone Control 319,971 31
Transistor Organ 209,567 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 170,923 27 *
FM Telephone Bug 242,441 57
Phone Busy Indicator 221,672 24 *
Remote Telephone Ringer 125,239 3 *
Ringing Phone Light Flasher 228,508 35 *
Simple Phone Tap Derek Tombrello 391,717 98 *
Telephone Hold Button 136,492 10
Telephone Recorder 224,306 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.