Elmo C300 meter voltage mod

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Real name: Philip Forrest
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Elmo C300 meter voltage mod

Post by Phil_F_NM » Mon Jan 22, 2018 7:41 pm

Has anyone ever undertaken the task of adding a diode between the battery and the meter cell to reduce the voltage from silver oxide down to old mercury cell standards? I need to drop 4.5v PX25 down to 3.9v in this new Elmo C300 of mine. I've thought about making a button cell cradle with the diode built in as a battery adapter but would rather take care of the whole problem from the start and just do the thing the right way.

I'm assuming (probably wrongfully so) that if I get the voltage to 3.9v I won't have to recalibrate the meter. If so, this project is going to take a lot longer than expected.

Thanks all.
Phil Forrest

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