[Heathkit] Solid State VOM model IM-25 Help needed

[Bwana Bob]

I think that what is typically used is a Zener reference diode or a 
voltage reference chip.

Bob WB2VUF

On 4/8/2015 8:35 PM, Walt - WB2VSJ wrote:
> Mercury batteries are no more.  Closest you can get is a hearing aid battery
> at 1.45V (Zinc Air) but they don't last too long.  That battery is also used
> to bias a transistor in addition to providing a 1.35 V reference  for the DC
> calibration.
>
> I was going to use something like this in a few of my meters that also used
> mercury cells:
>
> http://www.ebay.com/itm/5pcs-LM2596s-DC-to-DC-Buck-Converter-Adjustable-Powe
> r-Step-Down-Module-/281436507027?pt=LH_DefaultDomain_0&hash=item4186ec4b93
>
> Walt - WB2VSJ
>
>
> -----Original Message-----
> From: Heathkit [mailto:heathkit-bounces at mailman.qth.net] On Behalf Of David
> Sent: Wednesday, April 08, 2015 19:51
> To: Heathkit at mailman.qth.net
> Subject: [Heathkit] Solid State VOM model IM-25 Help needed
>
> Greetings. I was at a junk flee market in Yuma where I found the IM-25.
> What I would like to know is what is being used to replace the 1.4 volt
> Mercury calibration battery. The one in this unit I got is dead.
> Thanks for any help you can give me.
>
> Dave    VA7DG
>
>
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