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
Tuesday, September 15, 2026		 12VDC To 120VAC Inverter11
Dual Polarity Power Supply9
Yesterday
Monday, September 14, 2026		 12VDC To 120VAC Inverter39
Automatic 12V Lead Acid Battery Charger30
Of All Time 12VDC To 120VAC Inverter1,569,123
FM Transmitter1,038,367

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 238,795 61 *
Car Alarm Arming Horn Beep Canceller bob 147,305 6 *
Wireless Auto Tachometer 356,527 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 170,377 29 *
Parallel (Printer) Port Interface 303,155 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 463,168 63 *
3 Channel Spectrum Analyzer 236,933 20
40W Fluorescent Lamp Inverter Bart Milnes 342,817 60 *
Adjustable Strobe Light 324,071 36
Black Light 299,315 29
Colour (Sound) Organ 306,438 36
Electronic Dice NEW! 202,495 10 *
Fantastic Atom Expander 214,409 25
Flash Slave Trigger 235,144 18 *
Infa-Red Remote Control 654,555 216 *
IR Remote Extender NEW! 145,836 3 *
IR Remote Jammer Carl 281,206 110 *
IR Remote Switch NEW! 170,000 9 *
LASER Transmitter/Receiver 433,335 92
LED Chaser 463,464 83 *
LED Metronome NEW! 111,932 3 *
LED Thermometer 218,508 22 *
Light/Dark Detector 318,066 90 *
Simple Colour Organ 148,966 11 *
Strobe Light 288,071 27 *
TRIAC Light Dimmer 570,350 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 376,065 122 *
Electromagnetic Levitator NEW! 156,330 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 943,672 214 *
AC Motor Speed Controller 410,707 29 *
Air Flow Detector 264,633 54 *
Digital Keypad Combination Lock 214,062 20
Low Voltage Alarm 242,467 58 *
Pine Racecar Victory Judge 113,676 1 *
Pulse Width Modulation DC Motor Control 671,885 94
Rain Detector 318,475 112 *
Simple Lie Detector 580,875 323
Simple Polarity Tester Dudley LeRoux 178,392 13 *
Simple Servo Controller 235,341 22 *
Simple Touch Switch NEW! 183,420 6 *
Simple Two Speed Contactor DC Motor Controller 218,816 21 *
Stepper Motor Controller 771,941 120 *
Time Delay Relay 571,341 88
Time Delay Relay II jawaharlal@excite.com 260,888 39 *
Touch Switch 303,715 51 *
Video Activated Relay 133,362 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 196,891 10 *
Water Detector With Sump/Bilge Pump Controller 165,566 18 *
Wire Loop Alarm Alex Meaden 217,762 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 338,174 25 *
12VDC To 120VAC Inverter 1,569,123 691
6V to 12V Converter 545,989 121
Automatic 12V Lead Acid Battery Charger 956,950 248
Automatic Load Sensing Power Switch 180,705 16 *
Car Battery Charger 900,717 159 *
Dual Polarity Power Supply 387,231 84 *
Fixed Voltage Power Supply 324,780 52 *
High Current Power Supply 357,210 66 *
High Voltage High Current Power Supply 278,034 35 *
LASER Power Supply 310,941 28
Portable CD Player Adapter For Car 225,203 12 *
Power Supply 756,147 259 *
Solid State Tesla Coil NEW! 162,743 4
Solid State Tesla Coil/High Voltage Generator 464,686 51
Transformerless Power Supply 478,188 117 *
Voltage Inverter 359,764 51 *
Voltage Inverter II 217,172 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 600,143 182
3 Watt FM Transmitter Rae XL Tkacik 355,166 83 *
50 Watt Amplifier 524,998 74
8 Note Tune Player 152,616 12 *
8 Watt Audio Amp 392,140 67 *
Aircraft Radio Communications Receiver 296,311 50 *
Crystal Radio 175,418 53 *
Digital Volume Control 354,407 47 *
Electronic Stethoscope 338,201 142 *
FET Audio Mixer 358,269 41
FM Transmitter 1,038,367 420
Guitar Fuzz Effect 264,237 54 *
Microphone Mixer Anatoly I. Shikhatov 264,597 26 *
Mono To Stereo Synthesizer oRbEq 148,478 18 *
One Tube Regenerative Radio NEW! 166,708 4 *
Op Amp Radio 407,494 80 *
Single Chip AM Radio NEW! 112,996 4 *
Single Chip FM Radio NEW! 188,925 1 *
Sound Level Meter 356,854 51 *
Stereo Tube Amplifier Weslee Kinsler 283,481 15 *
Tone Control 325,283 31
Transistor Organ 214,635 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 174,881 27 *
FM Telephone Bug 246,422 57
Phone Busy Indicator 226,076 24 *
Remote Telephone Ringer 129,322 3 *
Ringing Phone Light Flasher 234,129 35 *
Simple Phone Tap Derek Tombrello 396,007 98 *
Telephone Hold Button 140,272 10
Telephone Recorder 228,439 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.