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, July 25, 2026		 Op Amp Radio33
12VDC To 120VAC Inverter29
Yesterday
Friday, July 24, 2026		 FM Transmitter32
12VDC To 120VAC Inverter31
Of All Time 12VDC To 120VAC Inverter1,566,826
FM Transmitter1,036,800

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 238,020 61 *
Car Alarm Arming Horn Beep Canceller bob 146,575 6 *
Wireless Auto Tachometer 355,626 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 169,626 29 *
Parallel (Printer) Port Interface 301,935 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 462,137 63 *
3 Channel Spectrum Analyzer 235,880 20
40W Fluorescent Lamp Inverter Bart Milnes 341,971 60 *
Adjustable Strobe Light 323,068 36
Black Light 298,222 29
Colour (Sound) Organ 305,349 36
Electronic Dice NEW! 201,576 10 *
Fantastic Atom Expander 213,553 25
Flash Slave Trigger 234,108 18 *
Infa-Red Remote Control 653,340 216 *
IR Remote Extender NEW! 144,868 3 *
IR Remote Jammer Carl 280,261 110 *
IR Remote Switch NEW! 169,135 9 *
LASER Transmitter/Receiver 432,380 92
LED Chaser 462,314 83 *
LED Metronome NEW! 111,057 3 *
LED Thermometer 217,702 22 *
Light/Dark Detector 317,210 90 *
Simple Colour Organ 148,080 11 *
Strobe Light 287,158 27 *
TRIAC Light Dimmer 569,230 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 374,995 122 *
Electromagnetic Levitator NEW! 155,606 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 942,253 214 *
AC Motor Speed Controller 409,603 29 *
Air Flow Detector 263,728 54 *
Digital Keypad Combination Lock 213,263 20
Low Voltage Alarm 241,579 58 *
Pine Racecar Victory Judge 112,840 1 *
Pulse Width Modulation DC Motor Control 670,771 94
Rain Detector 317,576 112 *
Simple Lie Detector 579,934 323
Simple Polarity Tester Dudley LeRoux 177,507 13 *
Simple Servo Controller 234,322 22 *
Simple Touch Switch NEW! 182,529 6 *
Simple Two Speed Contactor DC Motor Controller 217,927 21 *
Stepper Motor Controller 770,433 120 *
Time Delay Relay 570,154 88
Time Delay Relay II jawaharlal@excite.com 259,978 39 *
Touch Switch 302,772 51 *
Video Activated Relay 132,475 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 195,830 10 *
Water Detector With Sump/Bilge Pump Controller 164,778 18 *
Wire Loop Alarm Alex Meaden 216,854 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 336,683 25 *
12VDC To 120VAC Inverter 1,566,826 691
6V to 12V Converter 544,875 121
Automatic 12V Lead Acid Battery Charger 955,672 248
Automatic Load Sensing Power Switch 179,792 16 *
Car Battery Charger 899,672 159 *
Dual Polarity Power Supply 386,335 84 *
Fixed Voltage Power Supply 324,154 52 *
High Current Power Supply 356,421 66 *
High Voltage High Current Power Supply 277,426 35 *
LASER Power Supply 310,230 28
Portable CD Player Adapter For Car 224,510 12 *
Power Supply 755,280 259 *
Solid State Tesla Coil NEW! 161,864 4
Solid State Tesla Coil/High Voltage Generator 463,537 51
Transformerless Power Supply 477,514 117 *
Voltage Inverter 358,809 51 *
Voltage Inverter II 216,498 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 599,457 182
3 Watt FM Transmitter Rae XL Tkacik 354,279 83 *
50 Watt Amplifier 524,203 74
8 Note Tune Player 151,971 12 *
8 Watt Audio Amp 391,193 67 *
Aircraft Radio Communications Receiver 295,438 50 *
Crystal Radio 174,589 53 *
Digital Volume Control 353,617 47 *
Electronic Stethoscope 337,218 142 *
FET Audio Mixer 357,531 41
FM Transmitter 1,036,800 420
Guitar Fuzz Effect 263,423 54 *
Microphone Mixer Anatoly I. Shikhatov 263,888 26 *
Mono To Stereo Synthesizer oRbEq 147,804 18 *
One Tube Regenerative Radio NEW! 165,714 4 *
Op Amp Radio 406,621 80 *
Single Chip AM Radio NEW! 112,292 4 *
Single Chip FM Radio NEW! 187,908 1 *
Sound Level Meter 356,099 51 *
Stereo Tube Amplifier Weslee Kinsler 282,842 15 *
Tone Control 324,460 31
Transistor Organ 213,868 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 174,278 27 *
FM Telephone Bug 245,790 57
Phone Busy Indicator 225,393 24 *
Remote Telephone Ringer 128,749 3 *
Ringing Phone Light Flasher 233,357 35 *
Simple Phone Tap Derek Tombrello 395,377 98 *
Telephone Hold Button 139,735 10
Telephone Recorder 227,711 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.