Showing posts with label INCREASING THE INPUT IMPEDANCE. Show all posts
Showing posts with label INCREASING THE INPUT IMPEDANCE. Show all posts

Tuesday, November 10, 2015

INCREASING THE INPUT IMPEDANCE

The input impedance of a low cost analogue multimeter can be improved using this circuit. The approximate impedance increase will be about 250. 
The LED provides a fixed reference voltage for zero setting of the multimeter via VR1.
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