Johnson's Techworld

What is Special About VRLA (Valve Regulated Lead Acid) Batteries? Sealed Lead Acid Battery, Sealed Maintenance Free (SMF), Precautions for VRLA, Vent in flooded lead acid battery, Can

Demonstrating the use of an electrically driven hand drill, which can also be used as a screw driver! Different sizes of drill bits and screw drive adaptors are

Full playlist can be accessed at: https://www.youtube.com/playlist?list=PLKGLaS1jEidO-2uXc8G2PmFQANJdz0nOL

First in the series on how I work LEO satellites, mainly Amateur Radio on Interntation Space Station, with my limited setup. Working amateur radio satellites was my dream

Main advantage I find with the waterfall display is to monitor the bands in a silent mode when I work on my laptop. What are the ways of

Last year there was quite a buzz about the launch of an APRS balloon from an engineering college, in our LEO Satellite Repeater Contact Group. The launch was

Here I am demonstrating the extreme radio frequency interference from a small switch mode power supply (SMPS) powering the external speaker of my laptop. You can see the

I have been hearing of lithium iron phospate battery ever since I came back to ham radio last year and became active on Twitter (X). Initially I used