28 Aug
1998
28 Aug
'98
2:10 p.m.
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28 Aug
28 Aug
4:03 p.m.
On 28 Aug 1998, Marion Bates wrote:
Electronics 101:
I have a generic power adapter that's rated 9VAC, 780mA. I'd intended to use
for a VIC-20 and/or Atari 400. But when I took a reading with a voltmeter, it
came out about a volt and a half over. Is this too much for the machines I
have, or is it within tolerance?
Did you have any load on the output?
- don
Thank you,
-- MB
4:40 p.m.
On 28 Aug 1998, Marion Bates wrote:
I have a generic power adapter that's rated 9VAC,
780mA. I'd intended to use
for a VIC-20 and/or Atari 400. But when I took a reading with a voltmeter, it
came out about a volt and a half over. Is this too much for the machines I
You'll need some kind of load on it to get an accurate reading of its
output. Around 12 to 15 ohms, and able to disipate about 7 watts. I
don't know the supply requirements of those computers. But a couple volts
over spec is usually ok; if it wants an AC input, the computer must have
the remainder of the psu internal - its regulators should be able to
handle a little extra.
-WC
7:25 p.m.
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29 Aug
29 Aug
3:05 a.m.
On 28 Aug 1998, Marion Bates wrote:
I have a generic power adapter that's rated 9VAC,
780mA.
^^^^^
I don't think the voltage will be a problem, but the amperage looks a
little low on that supply.
Atari supplied power supplies rated between 1.7A and a whopping 5.6A for
the 400.
The AC VIC-20 power supply I have is rated at 3A.
I don't know what the actual requirements of the systems are, but I'd be a
little wary of using a 780mA power supply.
Doug Spence
ds_spenc(a)alcor.concordia.ca
http://alcor.concordia.ca/~ds_spenc/
9732
days inactive
9733
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4 comments
5 participants
participants (5)
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ard＠p850ug1.demon.co.uk -
donm＠cts.com -
ds_spenc＠alcor.concordia.ca -
Marion.Bates＠Dartmouth.EDU -
wcox＠mis.usaeroteam.com