Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!silver!commgrp
From: commgrp@silver.bacs.indiana.edu
Newsgroups: sci.electronics
Subject: Re: DC-DC inverter
Message-ID: <7200033@silver>
Date: 25 Apr 89 20:08:00 GMT
References: <10837@bloom-beacon.MIT.EDU>
Organization: Indiana University CSCI, Bloomington
Lines: 28
Nf-ID: #R:bloom-beacon.MIT.EDU:-1083700:silver:7200033:000:1072
Nf-From: silver.bacs.indiana.edu!commgrp    Apr 25 15:08:00 1989




>I am trying to design an alternative power supply for a photometer 
>(the GR1501-A...) it requires 3 45-Volt batteries which are almost 
>impossible to obtain, and when they are available, they are extremely 
>expensive.

>So what I'm trying to design is a DC-DC inverter that will take power
>from a 6V latern battery (or something similar) and covert it to a +90
>and -45 volt output...  Can you get IC's that will do something like
>this?   ...
>--
>Theodore Ts'o				bloom-beacon!mit-athena!tytso


Interim solution if space allows:  Stack groups of five 9v 
"transistor" batteries by their snap connectors, or remove their cases 
and solder the batteries together.  It's still expensive if you use 
alkalines, but has much greater capacity than those old-style "B" 
batteries.  9v alkaline batteries contain six little cylindrical cells 
smaller than AAA size, reported to have 500 mA-hour capacity.  The 
manufacturers claim 3-year shelf life.

--

Frank Reid     W9MKV @ K9IU   reidgold.bacs.indiana.edu
{inuxc,rutgers,uunet!uiucdcs,pur-ee}!iuvax!silver!commgrp