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, May 31, 2025		 FM Transmitter49
Sound Level Meter45
Yesterday
Friday, May 30, 2025		 Digital Volume Control149
LASER Transmitter/Receiver80
Of All Time 12VDC To 120VAC Inverter1,547,424
FM Transmitter1,021,128

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 231,248 61 *
Car Alarm Arming Horn Beep Canceller bob 140,392 6 *
Wireless Auto Tachometer 348,074 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 163,769 29 *
Parallel (Printer) Port Interface 292,817 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 453,565 63 *
3 Channel Spectrum Analyzer 227,822 20
40W Fluorescent Lamp Inverter Bart Milnes 334,746 60 *
Adjustable Strobe Light 314,819 36
Black Light 288,443 29
Colour (Sound) Organ 296,509 36
Electronic Dice NEW! 193,953 10 *
Fantastic Atom Expander 207,079 25
Flash Slave Trigger 226,352 18 *
Infa-Red Remote Control 643,475 216 *
IR Remote Extender NEW! 137,623 3 *
IR Remote Jammer Carl 272,067 110 *
IR Remote Switch NEW! 161,937 9 *
LASER Transmitter/Receiver 423,666 92
LED Chaser 452,640 83 *
LED Metronome NEW! 103,921 3 *
LED Thermometer 211,277 22 *
Light/Dark Detector 310,487 90 *
Simple Colour Organ 141,515 11 *
Strobe Light 280,379 27 *
TRIAC Light Dimmer 559,744 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 365,957 122 *
Electromagnetic Levitator NEW! 148,864 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 930,588 214 *
AC Motor Speed Controller 399,506 29 *
Air Flow Detector 256,556 54 *
Digital Keypad Combination Lock 206,471 20
Low Voltage Alarm 234,025 58 *
Pine Racecar Victory Judge 106,691 1 *
Pulse Width Modulation DC Motor Control 661,603 94
Rain Detector 310,033 112 *
Simple Lie Detector 571,106 323
Simple Polarity Tester Dudley LeRoux 170,071 13 *
Simple Servo Controller 226,700 22 *
Simple Touch Switch NEW! 174,869 6 *
Simple Two Speed Contactor DC Motor Controller 210,224 21 *
Stepper Motor Controller 757,805 120 *
Time Delay Relay 561,863 88
Time Delay Relay II jawaharlal@excite.com 252,522 39 *
Touch Switch 295,145 51 *
Video Activated Relay 126,108 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 186,651 10 *
Water Detector With Sump/Bilge Pump Controller 157,632 18 *
Wire Loop Alarm Alex Meaden 210,179 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 324,605 25 *
12VDC To 120VAC Inverter 1,547,424 691
6V to 12V Converter 535,111 121
Automatic 12V Lead Acid Battery Charger 945,006 248
Automatic Load Sensing Power Switch 172,500 16 *
Car Battery Charger 890,285 159 *
Dual Polarity Power Supply 377,312 84 *
Fixed Voltage Power Supply 317,042 52 *
High Current Power Supply 347,023 66 *
High Voltage High Current Power Supply 269,588 35 *
LASER Power Supply 302,375 28
Portable CD Player Adapter For Car 217,141 12 *
Power Supply 746,334 259 *
Solid State Tesla Coil NEW! 152,579 4
Solid State Tesla Coil/High Voltage Generator 452,370 51
Transformerless Power Supply 469,408 117 *
Voltage Inverter 348,055 51 *
Voltage Inverter II 209,070 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 591,511 182
3 Watt FM Transmitter Rae XL Tkacik 343,680 83 *
50 Watt Amplifier 515,201 74
8 Note Tune Player 145,376 12 *
8 Watt Audio Amp 380,855 67 *
Aircraft Radio Communications Receiver 286,261 50 *
Crystal Radio 164,963 53 *
Digital Volume Control 345,194 47 *
Electronic Stethoscope 328,230 142 *
FET Audio Mixer 349,875 41
FM Transmitter 1,021,128 420
Guitar Fuzz Effect 254,115 54 *
Microphone Mixer Anatoly I. Shikhatov 256,346 26 *
Mono To Stereo Synthesizer oRbEq 139,822 18 *
One Tube Regenerative Radio NEW! 153,539 4 *
Op Amp Radio 397,315 80 *
Single Chip AM Radio NEW! 104,952 4 *
Single Chip FM Radio NEW! 179,010 1 *
Sound Level Meter 348,059 51 *
Stereo Tube Amplifier Weslee Kinsler 274,174 15 *
Tone Control 315,911 31
Transistor Organ 205,903 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 167,925 27 *
FM Telephone Bug 239,495 57
Phone Busy Indicator 218,533 24 *
Remote Telephone Ringer 122,409 3 *
Ringing Phone Light Flasher 224,541 35 *
Simple Phone Tap Derek Tombrello 388,519 98 *
Telephone Hold Button 133,495 10
Telephone Recorder 221,371 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.