Re: I should probably be fired for even asking this question BUT ...
From: Fred (Fred_at_nospam.com)
Date: 06/17/04
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Date: Thu, 17 Jun 2004 17:31:32 +0100
"Norm Dresner" <ndrez@att.net> wrote in message
news:jljAc.84762$Gx4.42995@bgtnsc04-news.ops.worldnet.att.net...
> I need a very low-noise reference voltage, something around .5v or so for
> input to a very high input impedance (FET) comparator. While checking and
> changing the AA batteries in a phone today I found that 2 of the three
were
> discharged to around .8v -.9v Surely this is about as low-noise as it
gets
> and a simple few-megohm pot could be adjusted to provide the required
> voltage if the battery voltage remained stable.
>
> How constant would the output voltage of a partially discharged Alkaline
> battery remain with a, say, microampere load over a few months?
>
> Thanks in advance to all who answer for even considering this crackpot
idea
> worthy of comment.
>
> Norm
>
Won't a few megohms resistor produce quite a lot of noise?
What sort of bandwidth are talking of here?
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