Wayne,
I may be missing something here. Because the required voltage for an
OM1/OM1n is 1.35v and the lithium cells do not have the required current
characteristics. Your first para sounds like fry-baby time.
Rand E.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Wayne Shumaker wrote:
>
> Hi Tim & list,
>
> Thanks for all the info on mercury battery replacements. I have also
> been looking into some possibilities. I was looking through a Panasonic
> battery catalogue for possible battery replacements and I think that
> two CR1632 Lithium batteries would fit in an OM-1, giving a total
> voltage of 5-6V. Battery dimension is 16x3.2mm. The Varta 625 is
> 16x6.2mm.
>
> Also, one of the guys here at Linear Tech has designed a
> voltage-to-voltage charge pump (using external "flying caps") that can
> regulate it's output down to the bandgap voltage of 1.25V. It also
> draws about 18uAs of quiescent current. This would allow for a wide
> variation in battery voltage with a regulated 1.35V output voltage.
> Also, being a charge pump circuit, it should be relatively efficient,
> as compared to a linear regulator. I will look into this to see if such
> a circuit will fit in an OM-1. The part comes in an 8-pin SOT, needs
> two chip caps, a filter cap, and two feedback resistors to set the
> output voltage.
>
> Wayne
>
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