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
Wednesday, September 09, 2026		 12VDC To 120VAC Inverter14
12VDC To 120VAC Inverter14
Yesterday
Tuesday, September 08, 2026		 7 Segment LED Counter167
LED Chaser91
Of All Time 12VDC To 120VAC Inverter1,568,908
FM Transmitter1,038,201

Auto

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Circuit Author Views Rank Comments Marker
Automatic Headlight Brightness Switch 238,724 61 *
Car Alarm Arming Horn Beep Canceller bob 147,245 6 *
Wireless Auto Tachometer 356,449 58

Computer

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Circuit Author Views Rank Comments Marker
Computer Controlled Frequency Counter/Logic Probe Richard van Wyk 170,302 29 *
Parallel (Printer) Port Interface 303,053 71

Light/Laser

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Circuit Author Views Rank Comments Marker
12VDC Fluorescent Lamp Driver 463,087 63 *
3 Channel Spectrum Analyzer 236,842 20
40W Fluorescent Lamp Inverter Bart Milnes 342,748 60 *
Adjustable Strobe Light 323,998 36
Black Light 299,218 29
Colour (Sound) Organ 306,351 36
Electronic Dice NEW! 202,416 10 *
Fantastic Atom Expander 214,328 25
Flash Slave Trigger 235,058 18 *
Infa-Red Remote Control 654,471 216 *
IR Remote Extender NEW! 145,754 3 *
IR Remote Jammer Carl 281,138 110 *
IR Remote Switch NEW! 169,927 9 *
LASER Transmitter/Receiver 433,256 92
LED Chaser 463,312 83 *
LED Metronome NEW! 111,864 3 *
LED Thermometer 218,445 22 *
Light/Dark Detector 317,988 90 *
Simple Colour Organ 148,895 11 *
Strobe Light 287,999 27 *
TRIAC Light Dimmer 570,228 55

Major Projects

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Circuit Author Views Rank Comments Marker
Computerize Your Room/Home 375,955 122 *
Electromagnetic Levitator NEW! 156,259 15 *

Other

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Circuit Author Views Rank Comments Marker
7 Segment LED Counter 943,584 214 *
AC Motor Speed Controller 410,630 29 *
Air Flow Detector 264,557 54 *
Digital Keypad Combination Lock 213,979 20
Low Voltage Alarm 242,373 58 *
Pine Racecar Victory Judge 113,609 1 *
Pulse Width Modulation DC Motor Control 671,802 94
Rain Detector 318,405 112 *
Simple Lie Detector 580,788 323
Simple Polarity Tester Dudley LeRoux 178,318 13 *
Simple Servo Controller 235,259 22 *
Simple Touch Switch NEW! 183,344 6 *
Simple Two Speed Contactor DC Motor Controller 218,736 21 *
Stepper Motor Controller 771,826 120 *
Time Delay Relay 571,237 88
Time Delay Relay II jawaharlal@excite.com 260,819 39 *
Touch Switch 303,639 51 *
Video Activated Relay 133,296 8 *
Video Stabilizer/MacroVision Removal Antti Paarlahti 196,776 10 *
Water Detector With Sump/Bilge Pump Controller 165,504 18 *
Wire Loop Alarm Alex Meaden 217,683 27 *

Power Supply

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Circuit Author Views Rank Comments Marker
12V To 24V DC-DC Converter NEW! 338,059 25 *
12VDC To 120VAC Inverter 1,568,908 691
6V to 12V Converter 545,893 121
Automatic 12V Lead Acid Battery Charger 956,827 248
Automatic Load Sensing Power Switch 180,636 16 *
Car Battery Charger 900,620 159 *
Dual Polarity Power Supply 387,122 84 *
Fixed Voltage Power Supply 324,702 52 *
High Current Power Supply 357,138 66 *
High Voltage High Current Power Supply 277,964 35 *
LASER Power Supply 310,868 28
Portable CD Player Adapter For Car 225,130 12 *
Power Supply 756,062 259 *
Solid State Tesla Coil NEW! 162,658 4
Solid State Tesla Coil/High Voltage Generator 464,592 51
Transformerless Power Supply 478,122 117 *
Voltage Inverter 359,641 51 *
Voltage Inverter II 217,100 19 *

Sound/Radio

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Circuit Author Views Rank Comments Marker
22 Watt Audio Amplifier 600,066 182
3 Watt FM Transmitter Rae XL Tkacik 355,068 83 *
50 Watt Amplifier 524,910 74
8 Note Tune Player 152,540 12 *
8 Watt Audio Amp 392,038 67 *
Aircraft Radio Communications Receiver 296,215 50 *
Crystal Radio 175,332 53 *
Digital Volume Control 354,309 47 *
Electronic Stethoscope 338,107 142 *
FET Audio Mixer 358,182 41
FM Transmitter 1,038,201 420
Guitar Fuzz Effect 264,151 54 *
Microphone Mixer Anatoly I. Shikhatov 264,518 26 *
Mono To Stereo Synthesizer oRbEq 148,393 18 *
One Tube Regenerative Radio NEW! 166,574 4 *
Op Amp Radio 407,387 80 *
Single Chip AM Radio NEW! 112,934 4 *
Single Chip FM Radio NEW! 188,842 1 *
Sound Level Meter 356,758 51 *
Stereo Tube Amplifier Weslee Kinsler 283,407 15 *
Tone Control 325,214 31
Transistor Organ 214,533 29

Telephone

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Circuit Author Views Rank Comments Marker
Cut Phone Line Detector 174,808 27 *
FM Telephone Bug 246,356 57
Phone Busy Indicator 225,991 24 *
Remote Telephone Ringer 129,256 3 *
Ringing Phone Light Flasher 234,043 35 *
Simple Phone Tap Derek Tombrello 395,940 98 *
Telephone Hold Button 140,205 10
Telephone Recorder 228,373 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.