NetNews Usenet Archive 1993 #1/NN_1993_1.iso/spool/comp/sys/palmtops/4269

Text File | 1993-01-07 | 1.6 KB | 31 lines

Newsgroups: comp.sys.palmtops
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From: [e-mail] (Fritz Friedlaender)
Subject: Re: external power on 95
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Organization: Purdue University Engineering Computer Network
References: <1993Jan3.1238.3828@channel1> <[e-mail]> <[e-mail]>
Distribution: comp
Date: Thu, 7 Jan 1993 23:24:06 GMT
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There has been much duscussion on power supply voltages for the HP95LX,
with more fiction than fact (HP recommends a range - nowhere do they
say that 12V is too high to maintain. On the contrary, since HP
allows 12V, it must be safe - in their opinion, mine does not count).
I have a simple question to any owner of the "official" HP power
supply who also has a voltmeter: What is the open-circuit voltage
at the terminals of the HP power supply, and is it AC or DC?
Very few "garden variety" power supplies are regulated - an inexpensive
9V supply may have 13V on open circuit. It will give me more confidence
to use my supply if I know what HP does. Remember that the HP95LX, with
1MB, draws about 4.5mA when off (measured on my unit - what are your
values?) from the external power supply. The supply voltage will be
higher at that small load, than at the higher currents with the unit on.
I am looking for a number of responses, to help settle this question.
After you measure the open-circuit voltage, tell us whether disaster
ensued if you now discover that it is well over 12V.
Thank you,
FJF