-=>/Huh!/ Bad 24vdc power supplies!  What'cha gon', what'cha gon',
 what'cha gonna do when ROY J. TELLASON and THURSTON ACKERMAN come for you?<=-

 TA>  Industrial power supplies are also commonly 24VDC. So you can
 TA> check almost any industrial electric supplier.
 TA> ...

 RJT> Are they really?  Hm.

 RJT> I have one here,  a *big* one,  rated at something like 10A output.
 RJT> Dunno what I'm gonna do with it yet.  It was apparently a part of a
 RJT> telephone system at one point,  as that's what else was out there at
 RJT> curbside with it.  Local kids picked up the phones to play with,  and
 RJT> the other thing was the box that this PS plugged into,  I didn't snag
 RJT> that,  maybe I should have.    It would have at least given me the
 RJT> mating connector for the other end of this cable that's attached to
 RJT> this thing.

 RJT> It's got a big ferroresonant transformer in there,  an extra winding or
 RJT> two, apparently some provision for battery backup which isn't
 RJT> implemented,  and I can't recall what else.

Sounds like a supply for a 1A2 Key System (or the earlier 1A/1A1) -
large, old-fashoned phones with 6, 10, 20, or 30 buttons, including a
big red hold button (http://www.customphones.com/productCat38382.ctlg),
a heavy cord with a 'Centronics' style plug... The outputs on the supply
(mfg by Lorain Electronics or a licensee) should be 24vdc 1/2A signal
and talk (unfiltered *and* filtered), 10vac 10A lamp, 20vac 1/2A
low-voltage buzzer, and 105vac 20Hz ringing (Yes, 20Hz from 60Hz using
just a ferroresonant transformer (called a 'Subcycle' ring generator
- it uses a 40Hz parasitic to heterodyne the 60Hz to 20Hz or something
of the sort requiring ten pages of calculus to say "it works" *g*))

I still have a rack-mounted 10(IIRC) line Key Service Unit, that I used
to use as a test system to repair the phones when I was still in the
phone business, out in my garage. 8-)

Laird

... "Micro$oft Mobile Manor", Purdy, Wa - 1 mile north of Mary
Kay LeTourneau
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