Newsgroups: sci.electronics
Path: utzoo!wern
From: wern@utzoo.uucp (W.Thiel)
Subject: capacitors
Message-ID: <1989May28.005825.7455@utzoo.uucp>
Organization: U of Toronto Zoology
Date: Sun, 28 May 89 00:58:25 GMT

 Using capacitors to supply power to Cmos RAM

The Sharp pocket computer Model 1500 with about 8k of RAM
uses 2*220 microfarad to keep memory alive
during battery change.
It is certainly good for several minutes; based
on my experience; it may be as long as 20 minutes.
The measured current consumption on the Sharp Model 1200
is about 2 microampere when turned off. It has a 2.4k memory
This machine runs on one set of batteries for about
two years.
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|     Werner Thiel <> uunet!attcan!utzoo!wern  wern@zoo.toronto.edu     |
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