Audio Signal Injector
Audio signal injector is a must to have little tool for troubleshooting audio circuits. Connecting the audio signal injector to the circuit under test you should be able to hear its tone in the speaker […]
DC Gear Motor Primer
This article explains how to play with the common geared dc motors widely used to drive small robots and simple actuators. Geared dc motor is in fact an ordinary dc motor but with plastic or […]
Morse Code Practice Oscillator
I have received numerous requests for a simple, cheap and entry-level ham radio world project and the result is this do-it-yourself Morse Code Practice Oscillator usually called simply as Code Practice Oscillator (CPO). This project […]
EL Wire Lamp Driver/Inverter
Aim of this article is to provide a simple circuit to drive EL (Electro Luminescent) components. The minuscule driver design you can find here will render decent power to lights up a few feet of […]
USB Mug Warmer
How to build a USB Mug Warmer? It’s easy if you have a little skill and patience! This article will help you to build your own USB mug warmer using inexpensive components laying around your […]
Simple Crystal Tester
A budding electronics hobbyist often needs to pick crystals of right frequency for homebrew projects. To make that task a little more cheerful, I’m introducing this simple crystal tester circuit. It’s basically just a very […]
Arduino Sound Analyzer Primer
In this article I’ll show you how to capture sound signals on the Arduino and start some interesting experiments on it. Look for and gather a sound sensor module For the experiment initially you need […]
Electric Aroma Burner/Diffuser
Aroma burners/diffusers let the air around you deliver revitalizing and refreshing fragrance to your home/office interiors. This article guides you through the simple process of making your own electric aroma burner/diffuser. Gathering requisite components First […]
Generic 2A USB Car Charger – DIY
This time I’m going to show you how to build an inexpensive yet very useful generic 2A USB car charger for smartphones and tablets using off-the-shelf parts. What you can see here is a simplest […]
Simple Neon Glow Bulb Tester
Neon glow bulb is a nostalgic decorate lamp everybody seems to love. A small version is used still mainly as neon indicator light, also called pilot light, in electric/electronic instruments and appliances as a neon […]