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Re: [OM] How to build your own MR-9!

Subject: Re: [OM] How to build your own MR-9!
From: John Hermanson <omtech@xxxxxxxxx>
Date: Mon, 10 Aug 1998 17:08:49 -0400
I have found in multiple tests, the weincell introduces a 1/2 to 3/4
stop error (underexposure).

John

Frank van Lindert wrote:

> On Mon, 10 Aug 1998 10:14:56 -0700 (PDT), Robert Maichin
> <rmaichin@xxxxxxxxx> wrote:
>
> >A simpler solution is to use Zinc-air hearing aid batteries with an
> >adapter ( I used an old px13 shell). Battery needs some venting for
> >air but gives 1.4 volts very consistently.
>
> ... but only for a very limited amount of time (few months at most).
> Therefore the Zinc-air (including the Wein cell) solution is a
> dangerous one: the battery can suddenly prove empty on critical and
> unexpected moments.
>
> Frank van Lindert
> Utrecht - netherlands
>
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