Doorphone Intercom

Description: A simple Intercom made with a single transistor and low power audio amplifier LM386. The circui uses 8 ohm speakers, which ...

Dioda & Power Supply

This page shows circuits applications using small signal diodes or rectifiers . When not specified small signal diodes are used such as the...

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...