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Nonlinear Response Fix

A project log for Multimeter

This is my homebrew multimeter design. Included modes are VDC, Ohms, and Capacitance.

schuyler4schuyler4 07/10/2026 at 22:250 Comments

So here is a simple solution to the nonlinear response caused by adding the protection resistor.

The op amp has input protection diodes that clamp to the rail, so the zener isn't actually needed. And when it is removed it isn't cracking open at all, so no nonlinear response.

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