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From: mac@harris.cis.ksu.edu (Myron A. Calhoun)
Newsgroups: sci.electronics
Subject: Re: Has anyone made any homemade valves (tubes), semiconductors ...
Summary: "P" Cell
Keywords: urine
Message-ID: <1990Aug11.162721.8034@maverick.ksu.ksu.edu>
Date: 11 Aug 90 16:27:21 GMT
Expires: 25 August 1990
References: <872@massey.ac.nz> <1205@gold.GVG.TEK.COM>
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Organization: Kansas State University, Dept. of Computing and Information Sciences
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In article <872@massey.ac.nz> GMoretti@massey.ac.nz (Giovanni Moretti) writes:
>And how about batteries with household chemicals (ie not sulphuric)

Almost 30 years ago my senior electronics lab project included a
one-transistor amplifier powered by what my write-up called a "P"
cell.  I recall that it used a silver dime (yep, this was pre 1965),
a copper penny, a piece of ink blotter, and a couple drops of urine
(hence the name "P" or "Pee" cell!)  Worked like a charm.
--Myron.
--
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