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
AC conversion and Continuity – DMM
2020-12-31
U1A LF353 opamp turns on a buzzer when the voltage at Test + falls very low indicating a short between Test + and Test – or a resistor less thanRead More
Single Digit Voltmeter Improvements
2020-12-04
I would like to improve that circuit of a single digit voltmeter, I want to make it measure voltage from -9 V to +9 V but I don’t have anyRead More