Converts power supply to automatic battery charger using SCR-CA723
This is how to modify old Lead-acid battery charger or convert power supply to battery charger in automatic. To protect over charging by CA723 and power SCR Read more
NE5532 Pinout Datasheet Dual low noise op-amp
NE5532 is in Hi-Fi audio system a lot. Why? Read this datasheet, Get pinout, spec, how to use. For example preamplifier with tone control. Read more
Voltmeter: Working Principle and How to Increase the Range
My son want to make a simple DC voltmeter on 0-10V range by Convert a galvanometer to voltmeter.Galvanometer DC1mA is cheap and easy with one resistor only. Read more