digital voltmeter using 7107ic

Thread Starter

girish_kumar

Joined Dec 13, 2017
1
i want to make a dvm using 7107ic i have seen all the datasheet of this ic and make a schematic on proteus i have done the circuit calibration for full scale of 200v but i can not able to do the calibration of the circuit for 2000v for this I put a resistor across pin IN+ and IN- 120kohm but it show 199.9full scale, what i have to do.

and what is the process of selecting the range selector resistors and pot for calibration.

please help me

with regards
girish
 

Dodgydave

Joined Jun 22, 2012
9,417
Yes you need to make a Voltage Ladder at the input..

Here is a circuit for Ac, Dc voltage look at the voltage range switch, ignore the capacitors for DC.

the-AC-voltmeter-circuit.jpg
 
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