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, July 07, 2026		 Automatic 12V Lead Acid Battery Charger38
12VDC To 120VAC Inverter26
Yesterday
Monday, July 06, 2026		 Solid State Tesla Coil/High Voltage Generator118
Transformerless Power Supply78
Of All Time 12VDC To 120VAC Inverter1,565,978
FM Transmitter1,036,432

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 237,784 61 *
Car Alarm Arming Horn Beep Canceller bob 146,366 6 *
Wireless Auto Tachometer 355,381 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 169,414 29 *
Parallel (Printer) Port Interface 301,643 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 461,827 63 *
3 Channel Spectrum Analyzer 235,599 20
40W Fluorescent Lamp Inverter Bart Milnes 341,767 60 *
Adjustable Strobe Light 322,791 36
Black Light 297,878 29
Colour (Sound) Organ 305,046 36
Electronic Dice NEW! 201,318 10 *
Fantastic Atom Expander 213,322 25
Flash Slave Trigger 233,706 18 *
Infa-Red Remote Control 653,007 216 *
IR Remote Extender NEW! 144,610 3 *
IR Remote Jammer Carl 279,995 110 *
IR Remote Switch NEW! 168,905 9 *
LASER Transmitter/Receiver 432,112 92
LED Chaser 462,007 83 *
LED Metronome NEW! 110,787 3 *
LED Thermometer 217,475 22 *
Light/Dark Detector 316,976 90 *
Simple Colour Organ 147,852 11 *
Strobe Light 286,915 27 *
TRIAC Light Dimmer 568,669 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 374,666 122 *
Electromagnetic Levitator NEW! 155,379 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 941,888 214 *
AC Motor Speed Controller 409,283 29 *
Air Flow Detector 263,484 54 *
Digital Keypad Combination Lock 213,017 20
Low Voltage Alarm 241,321 58 *
Pine Racecar Victory Judge 112,617 1 *
Pulse Width Modulation DC Motor Control 670,472 94
Rain Detector 317,296 112 *
Simple Lie Detector 579,656 323
Simple Polarity Tester Dudley LeRoux 177,248 13 *
Simple Servo Controller 234,079 22 *
Simple Touch Switch NEW! 182,246 6 *
Simple Two Speed Contactor DC Motor Controller 217,624 21 *
Stepper Motor Controller 770,113 120 *
Time Delay Relay 569,880 88
Time Delay Relay II jawaharlal@excite.com 259,726 39 *
Touch Switch 302,471 51 *
Video Activated Relay 132,237 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 194,832 10 *
Water Detector With Sump/Bilge Pump Controller 164,548 18 *
Wire Loop Alarm Alex Meaden 216,618 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 336,276 25 *
12VDC To 120VAC Inverter 1,565,978 691
6V to 12V Converter 544,571 121
Automatic 12V Lead Acid Battery Charger 955,215 248
Automatic Load Sensing Power Switch 179,560 16 *
Car Battery Charger 899,380 159 *
Dual Polarity Power Supply 386,068 84 *
Fixed Voltage Power Supply 323,930 52 *
High Current Power Supply 356,095 66 *
High Voltage High Current Power Supply 277,114 35 *
LASER Power Supply 309,851 28
Portable CD Player Adapter For Car 224,237 12 *
Power Supply 754,926 259 *
Solid State Tesla Coil NEW! 161,569 4
Solid State Tesla Coil/High Voltage Generator 462,969 51
Transformerless Power Supply 477,267 117 *
Voltage Inverter 358,343 51 *
Voltage Inverter II 216,239 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 599,201 182
3 Watt FM Transmitter Rae XL Tkacik 353,987 83 *
50 Watt Amplifier 523,926 74
8 Note Tune Player 151,742 12 *
8 Watt Audio Amp 390,867 67 *
Aircraft Radio Communications Receiver 295,130 50 *
Crystal Radio 174,252 53 *
Digital Volume Control 353,323 47 *
Electronic Stethoscope 336,964 142 *
FET Audio Mixer 357,259 41
FM Transmitter 1,036,432 420
Guitar Fuzz Effect 263,044 54 *
Microphone Mixer Anatoly I. Shikhatov 263,637 26 *
Mono To Stereo Synthesizer oRbEq 147,546 18 *
One Tube Regenerative Radio NEW! 165,360 4 *
Op Amp Radio 406,276 80 *
Single Chip AM Radio NEW! 111,838 4 *
Single Chip FM Radio NEW! 187,580 1 *
Sound Level Meter 355,818 51 *
Stereo Tube Amplifier Weslee Kinsler 282,571 15 *
Tone Control 324,174 31
Transistor Organ 213,586 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 174,031 27 *
FM Telephone Bug 245,552 57
Phone Busy Indicator 225,157 24 *
Remote Telephone Ringer 128,519 3 *
Ringing Phone Light Flasher 232,956 35 *
Simple Phone Tap Derek Tombrello 395,150 98 *
Telephone Hold Button 139,549 10
Telephone Recorder 227,445 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.