DMM range and AC-DC mode Logic
2022-02-20
This is the third circuit that you will need to build a Simple Benchtop DMM with no Microcontroller. Here the U1D and U1B 4093 acts like a de-bouncing circuit forRead More
Power supply with battery backup – DMM
2022-01-29
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. TheRead More
Level Meter Circuits SPM-3 WG
2021-10-06
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 toRead More
Winding Insulation Resistance Measurement
2021-09-05
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 kRead More
Single Digit Voltmeter with LM311
2021-07-09
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. ThisRead More
Simple Millivolt Source for Calibration
2021-06-24
This is a modification of a mV Source that can be whipped up easily. You could use a DPM or Multimeter to read the output. The ability of this circuitRead More
Mains Voltage Monitor
2021-04-15
i need a circuit design to detect generator voltage and display with LED for certain value of voltage. for example red LED”s for voltage under 180 V, green LED forRead More
Build a DMM – LM3914 Analog display
2020-12-31
This a part of a complete Benchtop DMM that you can build to learn the internals of a Digital MultiMeter. This is oriented towards learning the measurement aspects and theRead More
