usb condom circuit

DIY USB Condom Circuit

T.K. Hareendran - 04/14/15

In a commercial manner, "usb condom" is a security device for preventing data theft through universal serial bus [...]
logic level shifter circuit

Bidirectional Logic Level Converter Circuit

T.K. Hareendran - 02/21/15

Often, it becomes necessary to interface an existing or new 5V AVR / PIC / MCU project to [...]

Automatic Hand Dryer Circuit

T.K. Hareendran - 12/16/14

Now and again ardent hobbyists looking to add something special and individual to their rest room/bathroom want an [...]
Clap Switch circuit schematic

Clap Switch Using Latching Relay

Jim Keith - 12/04/14

This is a simple clap switch circuit with high sensitivity. The only unusual component is the single coil [...]
water tank pump circuit

Smart Water Tank Pump Switcher

T.K. Hareendran - 11/18/14

For the residents who live in rural-areas, limited water-availability is a very common problem. Therefore, many people install [...]

Scheme-It = Online Schematic and Diagramming Tool

GaryC - 06/18/14

Scheme-It is an online schematic and diagramming tool that allows anyone to design and share electronic circuit diagrams. [...]
ir proximity sensor circuit

Automatic Soap Dispenser with IR Proximity Sensor

T.K. Hareendran - 06/10/14

Automatic Soap Dispensers designed for use with liquid soap are now widely available, and you may well know [...]
soldering iron adapter

Smart Soldering Iron Adaptor

T.K. Hareendran - 05/20/14

Every electronics dabbler must have a Soldering Iron. If you wanted a Smart Soldering Iron, you could pick [...]
Photomod Schematic

The Photomod Optical Coupler

Jim Keith - 04/20/14

The photomod opto isolator was the isolation device of choice (only choice) a generation ago. Since it predated [...]
free energy lie

The BIGGEST Lie about Free Energy

P. Marian - 02/22/14

There is a big lie about free energy and we are about to tell you why! Are you [...]
555 Astable Oscillator Experiment

IT = CV …or what I never learned in tech school

Jim Keith - 02/12/14

IT = CV is a very basic and useful relationship that all electronics students should master. It is [...]
Detail from Keystone Shortform Page

12V from the Keystone 503 & 498 Coin Battery Holders

Jim Keith - 01/24/14

Originally designed for the clunky lithium 3V 1/3N size battery, this battery holder is easily adapted to accommodate [...]
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