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, September 10, 2026		 Dual Polarity Power Supply28
12VDC To 120VAC Inverter26
Yesterday
Wednesday, September 09, 2026		 LED Chaser86
12VDC To 120VAC Inverter50
Of All Time 12VDC To 120VAC Inverter1,568,971
FM Transmitter1,038,241

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 238,733 61 *
Car Alarm Arming Horn Beep Canceller bob 147,257 6 *
Wireless Auto Tachometer 356,463 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 170,319 29 *
Parallel (Printer) Port Interface 303,066 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 463,114 63 *
3 Channel Spectrum Analyzer 236,863 20
40W Fluorescent Lamp Inverter Bart Milnes 342,766 60 *
Adjustable Strobe Light 324,012 36
Black Light 299,243 29
Colour (Sound) Organ 306,370 36
Electronic Dice NEW! 202,431 10 *
Fantastic Atom Expander 214,342 25
Flash Slave Trigger 235,079 18 *
Infa-Red Remote Control 654,485 216 *
IR Remote Extender NEW! 145,774 3 *
IR Remote Jammer Carl 281,155 110 *
IR Remote Switch NEW! 169,940 9 *
LASER Transmitter/Receiver 433,277 92
LED Chaser 463,402 83 *
LED Metronome NEW! 111,877 3 *
LED Thermometer 218,457 22 *
Light/Dark Detector 318,004 90 *
Simple Colour Organ 148,910 11 *
Strobe Light 288,018 27 *
TRIAC Light Dimmer 570,248 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 375,980 122 *
Electromagnetic Levitator NEW! 156,276 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 943,601 214 *
AC Motor Speed Controller 410,646 29 *
Air Flow Detector 264,577 54 *
Digital Keypad Combination Lock 214,006 20
Low Voltage Alarm 242,391 58 *
Pine Racecar Victory Judge 113,624 1 *
Pulse Width Modulation DC Motor Control 671,829 94
Rain Detector 318,424 112 *
Simple Lie Detector 580,808 323
Simple Polarity Tester Dudley LeRoux 178,338 13 *
Simple Servo Controller 235,278 22 *
Simple Touch Switch NEW! 183,360 6 *
Simple Two Speed Contactor DC Motor Controller 218,756 21 *
Stepper Motor Controller 771,858 120 *
Time Delay Relay 571,268 88
Time Delay Relay II jawaharlal@excite.com 260,839 39 *
Touch Switch 303,656 51 *
Video Activated Relay 133,315 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 196,803 10 *
Water Detector With Sump/Bilge Pump Controller 165,520 18 *
Wire Loop Alarm Alex Meaden 217,694 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 338,086 25 *
12VDC To 120VAC Inverter 1,568,971 691
6V to 12V Converter 545,915 121
Automatic 12V Lead Acid Battery Charger 956,861 248
Automatic Load Sensing Power Switch 180,646 16 *
Car Battery Charger 900,639 159 *
Dual Polarity Power Supply 387,154 84 *
Fixed Voltage Power Supply 324,718 52 *
High Current Power Supply 357,151 66 *
High Voltage High Current Power Supply 277,974 35 *
LASER Power Supply 310,893 28
Portable CD Player Adapter For Car 225,151 12 *
Power Supply 756,084 259 *
Solid State Tesla Coil NEW! 162,680 4
Solid State Tesla Coil/High Voltage Generator 464,619 51
Transformerless Power Supply 478,135 117 *
Voltage Inverter 359,668 51 *
Voltage Inverter II 217,117 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 600,087 182
3 Watt FM Transmitter Rae XL Tkacik 355,089 83 *
50 Watt Amplifier 524,928 74
8 Note Tune Player 152,558 12 *
8 Watt Audio Amp 392,060 67 *
Aircraft Radio Communications Receiver 296,236 50 *
Crystal Radio 175,352 53 *
Digital Volume Control 354,341 47 *
Electronic Stethoscope 338,129 142 *
FET Audio Mixer 358,209 41
FM Transmitter 1,038,241 420
Guitar Fuzz Effect 264,171 54 *
Microphone Mixer Anatoly I. Shikhatov 264,534 26 *
Mono To Stereo Synthesizer oRbEq 148,410 18 *
One Tube Regenerative Radio NEW! 166,620 4 *
Op Amp Radio 407,418 80 *
Single Chip AM Radio NEW! 112,954 4 *
Single Chip FM Radio NEW! 188,866 1 *
Sound Level Meter 356,781 51 *
Stereo Tube Amplifier Weslee Kinsler 283,427 15 *
Tone Control 325,227 31
Transistor Organ 214,569 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 174,826 27 *
FM Telephone Bug 246,366 57
Phone Busy Indicator 226,007 24 *
Remote Telephone Ringer 129,269 3 *
Ringing Phone Light Flasher 234,061 35 *
Simple Phone Tap Derek Tombrello 395,951 98 *
Telephone Hold Button 140,219 10
Telephone Recorder 228,388 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.