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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 [...]

Astable Multivibrator Schematic and Simulation

GaryC - 01/07/14

There are 3 types of multivibrators astable, monostable, and bistable. This astable multivibrator is an oscillator that generates [...]

Signal Injector Circuit

GaryC - 01/06/14

A signal injector is a very useful and quick troubleshooting tool for signal tracing in a circuit. Using [...]
Functional Schematic

Troubleshooting Automotive Ignition Systems – Part 2

Jim Keith - 11/14/13

The intermittent stalling problem was solved by replacing the distributor. This is the sequel to troubleshooting my ‘86 [...]
automatic pest repellent

Automatic Pest Repellent

T.K. Hareendran - 11/05/13

Automatic Pest Repellent is a non-chemical, clean, harmless and effective solution to unwanted pests. The circuit described here [...]
Bedwet wet diapers circuit

Bedwetting/Wet Diaper Alert System

T.K. Hareendran - 08/24/13

Bedwetting is one of the most common childhood problems that can have a significant impact on a child’s [...]

9 Reasons for Studying Electronic Engineering

Jim Keith - 07/11/13

I am writing this largely in the 1st person in order to convey how I, myself, feel about [...]
Computer Engineering

Computer Science or Computer Engineering, What to Choose?

P. Marian - 07/03/13

This guy has the best argument if you cannot decide what to choose between CE (Computer Engineering) and [...]
Troubleshooting Car Ignition Systems Schematic

Troubleshooting Automotive Ignition Systems – Part 1

Jim Keith - 06/22/13

Automobile ignition systems have never been more reliable, but when not, how does one troubleshoot? and is it [...]
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