2 Mar
1998
2 Mar
'98
9:26 a.m.
OK, so this is off topic for the list charter, but I have a
friend with a Telebit V.34 28.8 modem (part number AP-8810SA-001)
which doesn't have a power adapter. Does anyone know (just hoping -
not really expecting) what this thing is looking for in terms of
power, and if it takes a common transformer?
Thanks!
J. Maynard Gelinas
2 Mar
2 Mar
9:28 a.m.
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9:50 a.m.
Date: Mon, 2 Mar 1998 15:28:55 -0800 (PST)
From: Tim Shoppa <shoppa(a)alph02.triumf.ca>
To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
Subject: Re: Telebit modems
Tim,
No DIN or weird 3 pin doodad, in fact it looks like I could go
out to RS and buy any 'ol wall transformer for it. The connector is
the same used in US Robotics modems, most Walkmans, portable CD
Players, etc. Basically a hollow cylinder on the jack with conductors
on the inside and outside of the cylinder. This plugs into the back
of the modem, which has a recepticle for the plug containing a small
pin in the center. I'm sure you know what I mean, but I don't know
the term for this kind of plug.
Anyway, it looks deceptivly simple, but I don't want to go out
and buy the wrong transformer only to discover that I've blown the
modem. Does it take 12V, 9V, 3V, AC or DC (probably DC)? Oh well. I
also wrote Telebit, which was recently bought out, but I'm not
expecting an answer from them any time soon.
Thanks for the quick responce!
--jmg
OK, so this is off topic for the list charter,
but I have a
friend with a Telebit V.34 28.8 modem (part number AP-8810SA-001)
which doesn't have a power adapter. Does anyone know (just hoping -
not really expecting) what this thing is looking for in terms of
power, and if it takes a common transformer?
What sort of connecto does it have for the adapter? Is it a coaxial
jack, a DIN, or a weird 3-pin doodad?
Tim.
10:07 a.m.
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10:54 a.m.
Date: Mon, 2 Mar 1998 16:07:21 -0800 (PST)
From: Tim Shoppa <shoppa(a)alph02.triumf.ca>
To: "Discussion re-collecting of classic computers"
<classiccmp(a)u.washington.edu>
Subject: Re: Telebit modems
Most modems take AC line transformers, so they can easily generate the
positive and negative voltages that real RS-232 interfaces need. If
you take the cover off and find a diode bridge rectifier at the coaxial
jack, you want an AC adapter. Probably 12 VAC or so.
Most modems list the power requirement on the FCC sticker on the bottom.
Is this missing from yours?
Well, I opened up the modem and you're right about all. The
modem did have a diode, as well as a fuse. I plugged in an old US
Robotics transformer and it worked... thanks for the help! As for the
FCC sticker, yes it was on the bottom but nowhere on the modem was a
statement about power requirements - not even inside on the MB. Oh
well.
--maynard
7:07 a.m.
Well, I opened up the modem and you're right
about all. The
modem did have a diode, as well as a fuse. I plugged in an old US
Robotics transformer and it worked... thanks for the help! As for the
FCC sticker, yes it was on the bottom but nowhere on the modem was a
statement about power requirements - not even inside on the MB. Oh
well.
--maynard
Should use 9vac between 500mA to 800mA and you will in business.
I tried one 275mA transformer, USR 14.4kps ext. modem worked but
would not dial or connect up so I went to RS and got a single 9Vac
800mA wall wart and it's kosher afterwards.
:)
Jason D.
email: jpero(a)cgo.wave.ca
Pero, Jason D.
9574
days inactive
9574
days old
5 comments
3 participants
participants (3)
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jmg＠iac.net -
jpero＠cgo.wave.ca -
shoppa＠alph02.triumf.ca