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Capacitance Meter Circuit

admin June 2, 2010 4 Comments

Circuit Description

The circuit diagram of simple capacitance meter has been published here. The core part of this circuit is the frequency to voltage converter IC LM 2917 developed by National Semiconductors. This IC LM 2917 is a monolithic IC having a very high gain. This IC has got its primary application in tachometers. It can also be used for other applications as well.

This is a capacitor measurement circuit that displays capacitance by using a meter M1. The capacitor Cx whose capacitance is to be measured is connected between the pin2 of the IC and ground. The capacitance Cx will be proportional to the output voltage of the IC. At the output pin (pin4), a resistor R2 (10K) is connected as load. The voltage across this is displayed through a voltmeter (M1) which is connected across R2.

Circuit Diagram

Capacitance Meter Circuit

Capacitance Meter Circuit

Notes

  • Use a Vero board to assemble this particular circuit.
  • Use a suitable holder to mount the IC LM 2917.
  • Capacitance values from 0.01uF to 0.1uF can be measured using this circuit.
  • Potentiometer R1 (200K) can be used for calibrating this circuit.
  • Use a 10V FSD voltmeter in place of M1.
Comments
  • July 26, 2010

    Capacitance Meter Circuit…

    Circuit Description The circuit diagram of simple capacitance meter has been published here. The core part of this circuit is the frequency to voltage…

  • July 26, 2010

    Capacitance Meter Circuit…

    The core part of this circuit is the frequency to voltage converter IC LM 2917 developed by National Semiconductors………..

  • September 8, 2010

    How does it work? And why would you connect this to 110 VAC? If it is designed to randomly kill people who wish to measure the capacitance capacitors, then it is a good design.

  • slacker
    June 25, 2011

    I believe he is using the wall out for 60hz timing but that is just my take. and besides if you’re afraid of being shocked working with electricity is not your field.

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