Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site brl-tgr.ARPA 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-