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MeasuringmVUsingIC741Circuit252CDiagram

AC Millivolts Meter Circuit Using IC 741

Last Updated on November 9, 2023 by Swagatam 2 Comments

In this article we study an op amp based millivolt meter circuit designed to measure AC millivolts accurately, I have explained the details from the following explanation.

Table of Contents
  • Circuit Operation

The circuit shown below can be used to measure DC potentials in the range of milli-volts.

The circuit is highly sensitive and is calibrated to measure voltages in the range of  1 mV minimum to 1 V maximum.

Measuring potentials in the order of milli-volts is generally difficult using ordinary multimeters.

The circuit shown here can be used for sensing minute AC signals in the range of as low as 0.1 mV.

Circuit Operation

The transistors Q1 and Q2 has been configured as high gain feedback kind of amplifier, with the shown components the amplifier stage has been foxed to produce a gain of 100.

The next stage which consists of  two 741 ICs, IC1 and IC2, have been wired up as precision rectifiers.

These together are able to generate a gain of 10 over bandwidth that might extend above 50kHz or below 20 Hz.

The over all gain of the circuit therefore falls in the range of 1000, which makes it imperative to have signals below 1mV well attenuated.

The setting of the AC millivolt meter circuit does not involve much of complication, just the preset RV1 needs to be adjusted initially for making the connected meter show a zero when there's no signal at the input.

All resistors marked with asterisk must be 1% rated, MFR types.

AC millivolt meter circuit diagram

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Filed Under: Meters and Testers Tagged With: 741, AC, Meter, Millivolts

About Swagatam

I am an electronics engineer and doing practical hands-on work from more than 15 years now. Building real circuits, testing them and also making PCB layouts by myself. I really love doing all these things like inventing something new, designing electronics and also helping other people like hobby guys who want to make their own cool circuits at home.

And that is the main reason why I started this website homemade-circuits.com, to share different types of circuit ideas..

If you are having any kind of doubt or question related to circuits then just write down your question in the comment box below, I am like always checking, so I guarantee I will reply you for sure!

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