Quiz Circuit

  Notes: This design uses four IC's and has four input circuits and four independent outputs and a single master reset switch. The...

DC to DC Converter

The circuit below is a DC to DC converter using a standard 12 VAC center tapped power transformer wired as a blocking oscillator. The circu...

Simple Intercom

   Simple Intercom with IC = LM390

Intercom

A diagram of the modified mini amplifier as a two-way voice communication. Very easy to assemble and fun.

Equivalent Series Resistance Meter (ESR Meter)

Project Description This project was conceived as a way to enhance the collection of test equipment on my test bench. I buy a lot of o...

Bench Power Supply

Introduction After some fooling around with batteries every hobbyist should think seriously investing into a decent power supply . You cou...

AC Current Monitor

AC Current Monitor Senses high current-flow into power cables No wire-cutting, three versions available Circuit diagram: Parts: R1,R2...

Simple Capacitance Meter

Simple Capacitance Meter Operates in conjunction with a voltmeter 1pF to 22µF in six Ranges - 9V Battery supply Parts: P1_____________4...