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
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
Voltmeter Attenuator Rectifier
2020-09-19
Measurement of Voltage : – In testing electronic circuits, Measurement of voltages is important for diagnosing faults and making the circuits work. In circuit diagrams given in equipment manuals, voltagesRead More
Voltage Attenuator Amp – DMM Project
2019-10-28
LF356 opamp FET input is in a inverting amplifier configuration here. R4 + R5 make up Ri each 1/4 W MFR withstands 250V so both will take upto 500V. UseRead More
Analog and Digital Voltmeter using ICL7107
2019-06-11
This Circuit is a DPM or digital panel meter. It has a analog bar graph display and a 3-1/2 digit digital display. ICL7107 is used in the 200mV configuration. U4ARead More
Resistance measurement with Current Source – DMM
2015-04-23
U3 LF 356 is used as a constant current source (sink as the current is negative). R4, R5, R7 and R9 set the four resistance ranges by changing the constantRead More
