Power supply with battery backup – DMM
This is a simple charger circuit which will work for a light load like a DMM, the Battery can be a sealed maintenance free battery of 9V-2AH or better. The circuit will work best...
Category: Test-Measurement
Level Meter Circuits SPM-3 WG
Here are three circuits from the manual. The design is entirely on discrete devices like transistors, diodes and zeners. Studying these designs will reinforce your basics. It is easy to make things work with...
Winding Insulation Resistance Measurement
I am working in power plant. we have a problem on one of gas generator. the problem is that low winding insulation resistance of generator rotor. it read 800 k ohm where the other...
Single Digit Voltmeter with LM311
I wanted to design a logic probe as a tutorial, but there were many good ones in the web so i have tried to design a single digit voltmeter. This circuit is a design,...
