Posted on Aug 29, 2012

A2N3819 FETprovides a solid-state VOM. The 2N3819 acts as a cathode follower in a VOM. The bias offset (meter null) is obtained with R14 and R12 sets full-scale calibration. R2 through R9 should total about 10 MO.

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RlO is a protective resistor, and C2 provides ac bypassing to limit rf and noise pickup.

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