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Path: utzoo!watmath!clyde!cbosgd!ihnp4!zehntel!dual!amd!pesnta!hplabs!hao!seismo!brl-tgr!jcp
From: jcp@brl-tgr.ARPA (Joe Pistritto )
Newsgroups: net.analog
Subject: Re: Big Capacitors
Message-ID: <6146@brl-tgr.ARPA>
Date: Wed, 28-Nov-84 20:44:15 EST
Article-I.D.: brl-tgr.6146
Posted: Wed Nov 28 20:44:15 1984
Date-Received: Sat, 1-Dec-84 19:53:18 EST
References: <4682@fortune.UUCP>
Reply-To: jcp@brl-tgr.ARPA (Joe Pistritto )
Organization: Ballistic Research Lab
Lines: 19

In article <4682@fortune.UUCP> wall@fortune.UUCP (Jim wall) writes:
>	The physics of the cap is as follows. Early capacitors
>stored charges between plates of material. Large caps took large
>plates and rolled them into tight cylinders. This worked O.K. but
>the surface area was still small, and the larger the surface
>area, the higher the capacitance. The supercaps cover smaller plates
>with activated carbon particles. Each particle multiplies the surface
>area of a portion of the plate by a large amount. A plate covered with
>particles has a huge surface area, and hence a very high capacitance.
>
>	I have NECs liturature on them so more info is available...
>
>						-Jim Wall
>					....!amd!fortune!wall
This sounds like they should be non-polar then.  Has anyone tried using
these things to say, replace NICAD batteries?  It would seem that they
would have no memory problems.  Any idea on cost?

						-JCP-