Posted on Jun 24, 2012

This de voltmeter, with high input resistance, uses a CA3130 BiMOS op amp and measures voltages from 10 m V to 300 V. Resistors R12 and Rl4 are used individually to calibrate tbe meter for full:scale deflection.

Click here to download the full size of the above Circuit.

Potentiometer R6 is used to null tbe op amp and meter on the 10-mV range by shorting tbe input terminals, then adjusting R6 for tbe first indication of upscale meter deflection.

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