[sdiy] -48V dc/dc converters

[Sowa Roman]

if you say ericson and -48V in one mail, only one thing comes to mind:
telephony stuff, PBX. I work here with -48V convertors, but they are not
dc/dc, only powered from mains 220V. Some of them are as big as old
microwave oven and can deliver 105 amps of -48V. Usually can work
in paralel (we have 3 here) for greater redundancy.
They allways work in paralel with accumulators, hence 48V. This is
theory. Depending on battery type it can be even 56V.
Every telephony equipment uses -48V, so if you want to find a buyer
for it, search in that area.

Roman


""-----Original Message-----
""From: sasami at hotkey.net.au [mailto:sasami at hotkey.net.au]
""Sent: Thursday, April 18, 2002 2:29 PM
""To: synth-diy at dropmix.xs4all.nl
""Subject: [sdiy] -48V dc/dc converters
""
""
""
""Hi,
""
""does anyone know anything about -48V dc/dc converters? I have 
""several here
""with 5V or +/-12V. All have been pulled from unknown rack 
""type assemblies
""and use euro style connectors along the back. The overall 
""assemblies were by
""ericsson, though I can't be sure about the converters 
""themselves. Basically
""I want to know what sort of equipment these are used in (general, not
""specific), and if they are worth anything. If not, they'll end up as
""synthesizer parts.
""
""Ken 
""______________________________________________________________
""_________
""Ken Stone   sasami at hotkey.net.au  
""Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
""Australian Miniature Horses & Ponies 
""<http://www.blaze.net.au/~sasami/>
""
""
""
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