IM-25 Mercury Battery

Larry Gauthier larryg at ISMI.NET
Tue May 21 10:55:14 EDT 2002


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
>
>
>
>
> Internet access for $9.95 per month or $99 per year.
> Ask me how.  Nationwide coverage, Canada too!
>
> -----------------------------------------------------------
> This list is a public service of the City of Tempe, Arizona
> -----------------------------------------------------------
>
> Subscription control - http://www.tempe.gov/lists/control.asp?list=HEATH
> To post - HEATH at LISTSERV.TEMPE.GOV
> Archives - http://interactive.tempe.gov/archives/HEATH.html
>

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.asp?list=HEATH
To post - HEATH at LISTSERV.TEMPE.GOV
Archives - http://interactive.tempe.gov/archives/HEATH.html




More information about the Heath mailing list