Circuit | Category | Date Added | OK? | Votes | |
Simple moisture indicator | Misc | | | -4 |
|
Two-tone doorbell using 555 timer | Misc | | | -4 |
|
Momentary High Voltage Arc Circuit - can be used to Ignite a barbeque or a Gas in a Potato Gun | Misc | | | 3 |
|
Cat or Dog Detector - can be used to control entry on a Cat or Dog Door | Misc | | | -1 |
|
Fish caller circuit | Misc | Sep 23, 2009 | | -2 |
|
Powerful stun gun / taser circuit diagram | Misc | Sep 23, 2009 | | -1 |
|
Ultrasonic sound detector / sniffer | Misc | Sep 23, 2009 | | -1 |
|
Simple Frequency Reader for conversion VFOs | Misc | Oct 05, 2009 | | 2 |
|
Eddie's Composting Loo fan controller | Misc | Mar 09, 2012 | | 0 |
|
Touch operated Band switch for Radio Set | Misc | Oct 25, 2014 | | 0 |
|
Digital Remote Thermometer | Misc | Jun 26, 2009 | | 0 |
|
Capacitive Sensor | Misc | Jun 26, 2009 | | 1 |
|
Mains Remote-Alert - Remotely operates beeper and/or a LED via mains supply line | Misc | Jun 26, 2009 | | -2 |
|
Touch activated switch using CD4011 CMOS NAND gate | Misc | Jun 26, 2009 | | 1 |
|
Voice activated switch (VOX) circuit diagram | Misc | Jun 26, 2009 | | 0 |
|
UltraSonic Radar | Misc | Jun 26, 2009 | | 0 |
|
Nocturnal Animals Whisker | Misc | | | 0 |
|
Insect Repellant | Misc | Sep 17, 2009 | | -2 |
|
Digital Radar Speedometer | Misc | Oct 21, 2009 | | -2 |
|
Electromagnetic Field Probe with Meter Output using an LF351 opamp | Misc | Oct 19, 2009 | | -2 |
|
Missing Pulse Detector Circuit with 555 IC | Misc | Oct 03, 2013 | | -1 |
|
Chaos generator | Misc | Jan 26, 2001 | | -2 |
|
A Two-Way Morse Practice Set | Misc | | | 0 |
|
Voltage Comparator Information And Circuits | Misc | Apr 27, 2003 | | 0 |
|
Visible and Infrared Light Detectors | Misc | | | 1 |
|
Light Activated Detector Circuit (LM393/LM555) | Misc | Sep 10, 2006 | | 0 |
|
10 GHz CW Radar based on a X-band Gunnplexer | Misc | | | 0 |
|
Photodiode primer and interface circuit diagrams including photovoltaic and photoconductive modes | Misc | Mar 04, 2010 | | 0 |
|
Full-duplex doorphone with 3 wires connection | Misc | Mar 23, 2003 | | 0 |
|
G Strain energy absorber | Misc | Jan 01, 2003 | | 1 |
|
Amateur weather station to APRS interface ALWXI-01 | Misc | Oct 07, 2009 | | -1 |
|
Switch debouncer circuits including transistor, CMOS logic and a 555 timer based design | Misc | Jan 31, 2010 | | 0 |
|
Interesesting circuits using diodes ideal for education or introductory courses on electronics | Misc | Feb 20, 2010 | | -1 |
|
Selection of run circuits to experiment with the 4017 CMOS decade counter chip | Misc | Feb 26, 2010 | | -2 |
|
Variety of applications using a CMOS 4001 2-input NOR gate including a PCB layout | Misc | Feb 20, 2010 | | 0 |
|
Select of interesting electronic circuits that require only a single transistor ideal for education | Misc | Feb 20, 2010 | | 0 |
|
Small selection of useful circuits | Misc | Feb 09, 2010 | | -2 |
|
Marshmallow Bazooka with a PIC12F615 based capacitor discharge ignition system | Misc | May 16, 2010 | | 0 |
|
Touch sensistive touchpad based on a PIC16F627A micro | Misc | May 24, 2010 | | -1 |
|
Electric cockroach zapper | Misc | May 24, 2010 | | -2 |
|
Home-Built Magnetic Levitator | Misc | | | 0 |
|
Project for experimenting with magnetic levitation | Misc | | | 1 |
|
Ultrasound detector | Misc | Sep 13, 2006 | | -1 |
|
Build Your Own Video-Rate 2-photon Microscope | Misc | Sep 25, 2009 | | 0 |
|
Sony RS-422 ADAT sync cable pinout | Misc | Sep 10, 2006 | | 0 |
|
Garmin Foretrex 101,201, Forerunner 101,201 to Serial DB9 cable schematic pinout | Misc | Sep 10, 2006 | | 0 |
|
Simple DTMF Repeater Controller using PIC16F84 | Misc | | | -1 |
|
Build a Simple Bat Detector | Misc | Jan 08, 2014 | | 1 |
|
Capacitance to Voltage conversion | Misc | | | 0 |
|
Biasing Op-Amps into Class A | Misc | Jan 01, 2003 | | 0 |
|
Bleeper box for time reference | Misc | May 01, 2004 | | -1 |
|
Random noise generator | Misc | Jan 26, 2001 | | 0 |
|
Analog pulse counter | Misc | Aug 12, 2001 | | 0 |
|
Analog opto-isolator | Misc | Aug 12, 2001 | | 0 |
|
Pulse width modulators (PWM) | Misc | Aug 12, 2001 | | 0 |
|
Pulse width to voltage converter | Misc | Aug 12, 2001 | | -1 |
|
Air flow detector using an incandescent lamp to detect airflow | Misc | | | 0 |
|
Simple Lie Detector | Misc | Sep 01, 2009 | | 0 |
|
Low Voltage Alarm | Misc | Sep 01, 2009 | | 0 |
|
Rain Detector | Misc | Sep 01, 2009 | | 0 |
|
Magnetic levitation device | Misc | Aug 14, 2002 | | 0 |
|
Tesla power receiver | Misc | Jan 06, 2002 | | 0 |
|
1.9 Kilojoule Coil Gun | Misc | Nov 16, 2010 | | -1 |
|
A spark throwing tesla coil made entirely of garbage | Misc | Nov 16, 2010 | | 1 |
|
Basic Homebuilt Discrete DTL gate circuits (Diode Transistor Logic) | Misc | | | 0 |
|
Lazer Tag Equipment Modifications | Misc | Mar 23, 2003 | | 0 |
|
Inexpensive APRS Weather Station | Misc | Aug 14, 2002 | | 0 |
|
Induced voltage sensor delta-peak trigger for coilgun | Misc | | | 0 |
|
Open loop pulse trigger module for coilgun | Misc | | | -1 |
|
Optical speed trap to measure the the velocity of the projectile | Misc | | | 0 |
|
Optical trigger module for coilgun | Misc | | | -1 |
|
Power MOSFET module for coilgun | Misc | | | 0 |
|
Three stage induced voltage triggered coilgun | Misc | | | 0 |
|
Thyristor fired coilgun circuit diagram | Misc | | | -1 |
|
Magnetic levitation project from Electronics Now, February 1996 | Misc | | | 0 |
|
LNS Technologies Levitator Kit circuit diagram | Misc | | | 0 |
|
Magnetic levitation project from Popular Electronics, May 1966 | Misc | | | 0 |
|
Magnetic levitation project from Popular Electronics, May 1989 | Misc | | | 0 |
|
Barry's magnetic levitation project | Misc | | | 0 |
|
Barry's Coilgun Mark I circuit diagrams | Misc | | | 0 |
|
Barry's Coilgun Mark II circuit diagrans | Misc | | | 0 |
|
Barry's Coilgun Mark III circuit diagrans | Misc | | | 0 |
|
Barry's Coilgun Mark IV circuit diagrans | Misc | | | 0 |
|
Circuit diagram for Coilgun Pistol Pskov 1100 | Misc | | | -1 |
|
1uS light pulse descriminator plus F to V converter (PDF) | Misc | Jan 26, 2001 | | 0 |
|
Broadband 2MHz optical fiber receiver (PDF) | Misc | Jan 26, 2001 | | 0 |
|
Modulated light receiver circuit (PDF) | Misc | Jan 26, 2001 | | 1 |
|
1uS light pulse receiver plus post amp (MISC) | Misc | Jan 26, 2001 | | 0 |
|
Broadband 5MHz optical fiber receiver (PDF) | Misc | Jan 26, 2001 | | 0 |
|
High-speed 75MHz light receiver (PDF) | Misc | Jan 26, 2001 | | 0 |
|
Basement doorbell beeper (PDF) | Misc | Jan 26, 2001 | | 0 |
|
Time to dust indicator - battery powered dust indicator (PDF) | Misc | Jan 26, 2001 | | -1 |
|
Low-power optical interrupter (PDF) | Misc | Jan 26, 2001 | | 0 |
|
Simple nitrogen spark generator (PDF) | Misc | Jan 26, 2001 | | 0 |
|
Op Amp Comparator with Hysteresis with SPICE simulation | Misc | Mar 26, 2011 | | 1 |
|
Op Amp Precision Half-wave Rectifier including SPICE simulation | Misc | Mar 26, 2011 | | 0 |
|
Single-Supply AC Inverting Op Amp amplifier with SPICE simulation | Misc | Mar 26, 2011 | | 0 |
|
Hacking the Hot Wheels Radar Gun - includes circuit of analog front end | Misc | | | 0 |
|
Automatic Plant Irrigation System Circuit for Watering Plants without any Human Interference. | Misc | Dec 07, 2014 | | -1 |
|
Circuit for gold wafer card | Misc | Feb 21, 2005 | | 1 |
|
Nokia 3310 Lcd Thermometer using DS18B20 | Misc | Feb 21, 2005 | | 0 |
|
Lost keys finder using HCF4069 | Misc | Feb 21, 2005 | | 1 |
|
Lightning Detector | Misc | Feb 21, 2005 | | -2 |
|
Geomagnetic field detector | Misc | Feb 21, 2005 | | -1 |
|
Fogger smoke machine controller | Misc | Jan 26, 2001 | | 0 |
|
Mobile APRS / GPS tracking system | Misc | May 01, 2004 | | 0 |
|
GPS receiver support kit | Misc | May 01, 2004 | | 0 |
|
Circuit diagrams for making logic gates from discrete components | Misc | Oct 25, 2009 | | 0 |
|
Lightning detector circuit diagram | Misc | Sep 08, 2009 | | 0 |
|
6 Pole ElectroMagnet Motor (aka Simple Brushless motor) | Misc | | | -1 |
|
Solid State Tesla Coil and Wireless Power | Misc | | | 0 |
|
Tesla coil construction project | Misc | | | 0 |
|
Vareity of circuits for interfacing to/from TTL logic | Misc | | | 0 |
|
Dinsmore 1490 digital compass | Misc | Nov 29, 2002 | | 0 |
|
Geiger counter circuit diagram | Misc | Nov 29, 2002 | | -2 |
|
Electric field disturbance monitor | Misc | Jan 26, 2001 | | 0 |
|
Inexpensive seismometer project | Misc | Dec 15, 2002 | | 0 |
|
Digg Button Kit | Misc | Oct 12, 2009 | | 0 |
|
SIM card reader circuit diagram | Misc | Oct 12, 2009 | | 0 |
|
Circuit for driving a liquid crystal (LCD) shutter to simply pass or block light | Misc | Dec 21, 2009 | | 0 |
|
Lie detector | Misc | | | 0 |
|
Three component bat detector based on a PIC12F683 microcontroller | Misc | Jun 27, 2010 | | -1 |
|
Homemade GPS jammer using a MC145151 frequency synthesizer | Misc | Jan 17, 2011 | | -4 |
|
Popular Electronics Ultrasound Detector | Misc | Jan 01, 2003 | | 0 |
|
Navigator 555A radio direction finder (RDF) circuit diagram | Misc | May 01, 2004 | | 0 |
|
Touch switches | Misc | Mar 05, 2009 | | -1 |
|
Build your own UFO Bino-Scope unit - upgrade binoculars to become a photosensitive bino-scope | Misc | | | 0 |
|
Color sensor circuit | Misc | | | 0 |
|
PASCO scientific model SF-9211 stroboscope schematic (PDF) | Misc | | | 0 |
|
u-Blox GPS receiver board | Misc | Mar 23, 2003 | | 0 |
|
Assorted digital circuits | Misc | Mar 18, 2003 | | 0 |
|
Basic opamp circuits | Misc | Mar 18, 2003 | | 0 |
|
Miscellaneous simple circuits | Misc | Mar 18, 2003 | | 0 |
|
Simple electronic keyer | Misc | | | -1 |
|
FM Morse Code Keyer | Misc | | | 0 |
|
Easy Morse Code Keyer Circuit | Misc | | | -1 |
|
CW Tone Keyer | Misc | | | 0 |
|
Digital Call Sign Annunciator | Misc | Jun 09, 2002 | | 0 |
|
Monitor output from Motorola Oncore GPS engine in HP Z3801A in GPS Disciplined Oscillator | Misc | May 01, 2004 | | 0 |
|
Ultrasonic switch transmitter and receiver circuit diagram | Misc | Jan 26, 2001 | | 0 |
|
Plant Watering Watcher (moisture meter) | Misc | | | 0 |
|
DIY Plasma Globe using an automotive ignition coil | Misc | | | 0 |
|
DIY Tesla coil - DC Powered with Plasma Output | Misc | | | 0 |
|
Stroboscope | Misc | Aug 17, 2009 | | 0 |
|
Very basic circuits | Misc | Jan 26, 2001 | | -1 |
|
Bat detector | Misc | Jan 26, 2001 | | 0 |
|
Electronic canary doorbell | Misc | | | 0 |
|
Electronic dazer | Misc | | | -1 |
|
Jacob's Ladder | Misc | | | -2 |
|
Negative Ion Detector | Misc | | | -2 |
|
Negative Ion Generator | Misc | | | 0 |
|
Tesla coil | Misc | | | 0 |
|
Solid state tesla coil | Misc | | | 0 |
|
High voltage zappers | Misc | | | -4 |
|
Morse Code Practice Keyer 1 | Misc | Jan 26, 2001 | | 0 |
|
Morse Code Practice Keyer 2 | Misc | Jan 26, 2001 | | 0 |
|
741 Light Sensor | Misc | Jan 26, 2001 | | -1 |
|
Fluid level detector | Misc | Jan 26, 2001 | | 2 |
|
Touch switch using transistors | Misc | | | -1 |
|
FCTS Project | Misc | Mar 25, 2001 | | 0 |
|
Count Accumulator for Radiation Levels (CARL) | Misc | Sep 21, 2006 | | 0 |
|
Modifications for CDV700 Geiger Counter | Misc | Sep 21, 2006 | | 0 |
|
Big Ear Stereo Parabolic Microphone | Misc | Sep 21, 2006 | | 0 |
|
Ultra Low Power LCD Indicator | Misc | Sep 21, 2006 | | 0 |
|
12 Volt Toilet Tank Refiller circuit diagram | Misc | Sep 21, 2006 | | 0 |
|
Morse Code Beacon Keyer | Misc | Jan 26, 2001 | | 0 |
|
Weather station with pressure reading, relative humidity, indoor & remote temperature reading | Misc | | | 0 |
|
Induction receiver for tracing wiring behind walls, hearing lightning and other electric discharges | Misc | | | 0 |
|
Texas Instruments collection of differential op-amp circuits (PDF) | Misc | | | 1 |
|
Texas Instruments collection of buffer op-amp circuits for ADC | Misc | | | 1 |
|
Building a Hardware Random Bit Generator | Misc | | | 0 |
|
Delayed shutter control for Kodak DC-20 | Misc | Jul 24, 2002 | | 0 |
|
Morse code display | Misc | Jul 24, 2002 | | -2 |
|
Circuit for temperature stabilization of a MTP3055E MOSFET | Misc | Sep 01, 2009 | | 0 |
|
Kenwood TH-D7 NMEA GPS bug fix | Misc | | | 0 |
|
Doorbell for the deaf that provides a delayed visual indication when a doorbell switch is pressed | Misc | Nov 27, 2002 | | 0 |
|
Electromagnetic field detector | Misc | Jan 26, 2001 | | 1 |
|
High Quality Intercom | Misc | Nov 27, 2002 | | 0 |
|
Magnetic Gun. | Misc | Nov 27, 2002 | | 0 |
|
Static Electricity / Negative Ion Detector | Misc | Nov 27, 2002 | | 0 |
|
Ultrasonic dog whistle | Misc | Jan 26, 2001 | | 0 |
|
Scaling ADXL50 accelerometer output | Misc | Jan 26, 2001 | | -1 |
|
Infrasound circuits including several infrasound amplifier circuit diagrams | Misc | Jul 05, 2015 | | 0 |
|
Ghost detector - detects if a ghost disturbs the electric field in the vicinity of the device | Misc | Jul 10, 2015 | | 0 |
|
Lightning detector to receive static pulses from lightning at a frequency near 200 kHz | Misc | Jul 10, 2015 | | 0 |
|
Atmospheric receiver to detect crackling static in a radio produced by lightning | Misc | Jul 10, 2015 | | -1 |
|
Powerful buzzer for use as a doorbell or to notify others in different rooms dinner is ready etc | Misc | Jul 15, 2015 | | 0 |
|
Powerful Security Siren - Transistors based and operates from 12V power supply | Misc | Jul 15, 2015 | | 1 |
|
Whistle Responder - Beeps when hears your whistle, A gadget suitable for key-holders, games etc. | Misc | Jul 22, 2015 | | 0 |
|
Water Level Indicator Using 7-Segment Display | Misc | Jul 30, 2015 | | 0 |
|
Rainwater Storage Gauge | Misc | Jul 30, 2015 | | 0 |
|
Cat and Dog Repeller | Misc | Jul 30, 2015 | | 0 |
|
Inexpensive Remote Watering System | Misc | Jul 30, 2015 | | 0 |
|
You Have Mail! Letterbox monitoring system | Misc | Jul 30, 2015 | | -1 |
|
Environmentally-friendly Mosquito Repeller | Misc | Jul 30, 2015 | | 0 |
|
Doorbell Memory Circuit Diagram | Misc | Jul 30, 2015 | | -1 |
|
Plant Watering Watcher Circuit Schematic | Misc | Jul 30, 2015 | | 0 |
|
Salt Taster Circuit Diagram | Misc | Jul 30, 2015 | | 1 |
|
430J Coil Gun circuit schematic | Misc | Oct 13, 2015 | | 1 |
|
Stun gun circuit diagram and construction details | Misc | Oct 13, 2015 | | 0 |
|
Negative ion generator circuit diagram | Misc | Oct 13, 2015 | | 1 |
|
Circuit diagram for simple DIY induction heater | Misc | Oct 13, 2015 | | 1 |
|
Soldering Iron Tip Preserver | Misc | Oct 22, 2015 | | -2 |
|
Morse Code Beacon Keyer | Misc | Nov 30, 2015 | | 0 |
|
Lighting Storm Monitor | Misc | Jul 24, 2016 | | -1 |
|
1 Hz to 10 MHz Voltage to Frequency Converter | Misc | Sep 07, 2016 | | 0 |
|
Wide Bandwidth Cell Phone Jammer | Misc | Sep 07, 2016 | | -1 |
|
800 MHz Base Station Chaos Jammer | Misc | Sep 07, 2016 | | -1 |
|
800 MHz Phone Jammer | Misc | Sep 07, 2016 | | 0 |
|
1900 MHz Phone Jammer | Misc | Sep 07, 2016 | | 0 |
|
GSM Phone Jammer - P2JBZ | Misc | Sep 07, 2016 | | 0 |
|
Near-Field PCS Phone Jammer | Misc | Sep 07, 2016 | | 1 |
|
PCS Phone Jammer | Misc | Sep 07, 2016 | | -1 |
|
Once pulse per pushbutton press circuit diagram | Misc | Oct 02, 2016 | | 0 |
|
MOSFET Temperature Protection | Misc | Oct 08, 2016 | | 0 |
|
Handheld GPS Glareshield (or Dashboard) Mount with Power Supply | Misc | Oct 15, 2016 | | 0 |
|
Radar Detector - W1SNN | Misc | Oct 17, 2016 | | -1 |
|
Ultrasonic Proximity Detector 2xBJT | Misc | Oct 17, 2016 | | 0 |
|
Precise Movement Meter | Misc | Oct 17, 2016 | | 0 |
|
Proximity Detector NE567 | Misc | Oct 17, 2016 | | -1 |
|
DC Current Monitor | Misc | Oct 20, 2016 | | 0 |
|
Proportional Temperature Control for Gunnplexer - W4UCH | Misc | Oct 20, 2016 | | 1 |
|
Ultrasonic Bat Receiver - M0DGQ | Misc | Oct 20, 2016 | | 0 |
|
Measuring speed of light using an oscilloscope | Misc | Oct 20, 2016 | | -1 |
|
800 MHz Phone Jammer ver.A | Misc | Oct 20, 2016 | | 5 |
|