IM-25 Mercury Battery

[Larry Gauthier]

Greg,

We always modified our bench meters by removing the batteries and replacing
them with a cheap-and-dirty power supply by: rectifying and filtering the
filament voltage, passing the voltage through a low value resistor, and then
creating a 1.2v reference source by using two silicon diodes in series to
ground. (effectively a 1.2 volt reference).

-larry
K8UT
a former ham from heath
----- Original Message -----
From: "Greg WB8NGA" <Greg at BOWSER.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Monday, May 20, 2002 11:13 PM
Subject: IM-25 Mercury Battery


> Just picked up an IM-25 bench volt meter and it is missing the 1.35 volt
mercury battery that is
> used for resistance measurements.  I know that these batteries are no
longer being made but wonder
> what some of you others are doing as a work around?
>
> Thanks,
> Greg  W8NGA
>
>
>
>
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