NetNews Usenet Archive 1993 #1/NN_1993_1.iso/spool/sci/electron/22186

Internet Message Format | 1993-01-07 | 1.4 KB

Xref: sparky sci.electronics:22186 rec.music.synth:19796 comp.music:5954
Newsgroups: sci.electronics,rec.music.synth,comp.music
Path: sparky!uunet!gatech!udel!rochester!rit!isc-newsserver!mxd7977
From: [e-mail] (ELECTRONIC MUSICIAN)
Subject: HELP! Adding Battery Back-up
Message-ID: <[e-mail]>
Originator: mxd7977@ultb
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Organization: Rochester Institute of Technology
Date: Thu, 7 Jan 1993 16:05:27 GMT
Lines: 16

I am trying to add battery backup to one of my sound modules, and I was
wondering just how difficult or more precisely what the best way is to
go about it.  From what I understand, you locate all temporary memory
IC's disconnect the +5 from them, and then attach their power lines to a
circuit which switches between normal operating voltage during power up
situations and a 3.3 volt lithium during power down situations....is
this a correct assumption?  And if so what do you think the best
configuration is? Should I use a zener with a voltage comparator which
switches off the normal power and on the battery by way of diodes when
the voltage drops too low?  Any insight would be much appreciated.  I am
a computer engineer, but haven't had much exposure with battery backed
up ram systems (at least not at this level...)


Thanks,
E. M.