Household 9V Battery Tester v1
The Household 9V Battery Tester presented here is not very accurate and is probably better as an estimating tool than a precise battery tester. I still highly recommend building this little project as it is […]
LED Ice Cube DIY
Like many other Chinese funny gadgets, liquid-activated light up ice cubes are now flooding our markets. We can easily buy many of them for a few bucks, but what about making similar beautiful cubes ourselves? […]
Qi Wireless Chargers & Funny LED Toys
I have been experimenting with wireless charging for a few years now, including building some fun projects with readymade Qi wireless chargers and wireless charging modules! I think you also know that it is pretty […]
Multipurpose LED Flashlight Teardown
So here is an out-of-warranty Pigeon Multipurpose LED Flashlight that just suddenly stopped working so I figured why not take a crack at it. I bought it on discount sale from an Indian online store […]
Arduino Stepper Motor – A Quick Revision
After seeing an inspiring post on a website about making a simple automatic pet feeder using a cheap stepper motor, I decided to re-do some trivial experiments with it. For that I chose the very […]
Relay & Electronics – A Quick Refresher
In this short post we will again take a nimble look at electromagnetic relays and the electronics associated with them. As we all know, an electromagnetic relay is a simple electromechanical switching device that uses […]
Little Noise Makers – A Quick Revision
I have already outlined many times here how to build very simple noise makers or noise generators. Also, there are many more outside this space, here is a randomly picked project example Arduino White Noise. […]
Programmable Gain Amplifier (PGA) – Random Talks
A programmable gain amplifier (PGA) is an electronic amplifier, typically based on an operational amplifier (op amp), whose gain can be changed by external control signals. Recently, I have been thinking about a basic programmable gain amplifier that can be quickly […]
Simple CMOS Bilateral Switch
This little post is to refresh your knowledge about the far-famed CD4066B CMOS Quad Bilateral Switch IC. The CD4066B is a quad bilateral switch intended for the transmission or multiplexing of analog or digital signals. […]
Touchless Live Wire Detector – STEM Fun
This post explains how to make a simple touchless live wire detector that can be used to find hidden electrical wiring in a wall or ceiling. This battery powered tester is actually a very simple […]