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From: kludge@grissom.larc.nasa.gov ( Scott Dorsey)
Newsgroups: sci.electronics
Subject: Re: What is the noise voltage of a 1.5V cell
Message-ID: <1991Jan3.132727.10780@news.larc.nasa.gov>
Date: 3 Jan 91 13:27:27 GMT
References: <1991Jan3.001303.483@ae.chalmers.se>
Sender: news@news.larc.nasa.gov (USENET Network News)
Reply-To: kludge@grissom.gatech.edu ( Scott Dorsey)
Organization: NASA Langley Research Center
Lines: 17

In article <1991Jan3.001303.483@ae.chalmers.se> hogstedt@ae.chalmers.se (PER HOGSTEDT) writes:
>As a kind of last resort, I would like to know what the noise is of a 
>regular 1.5V (e.g. alkaline) cell, assuming the cell is kept at
>room temperature and loaded only by some microAmps?

   I don't know what the value is offhand, but it's low-but-measurable,
and fairly well distributed.  A reference oscillator I use has a reactance
tube which uses a battery as the bias source for low noise.  Alkaline cells
are better than dry batteries, and mercury cells are much lower noise than
the alkaline ones.  I haven't tried lithium or magnesium cells, but they
might be worth fooling around with.  It's so easy to get batteries, so give
it a try.
--
Scott Dorsey/ Kaptain Kludge
NASA Langley Research Center, Aircraft Guidance and Control Branch

Disclaimer: Neither NASA nor Lockheed really know anything about what