[Elecraft] 48V, plus or minus, usually

[G3VVT at aol.com]

In a message dated 08/01/05 14:45:58 GMT Standard Time, kz1x at yahoo.com  
writes:

>>  It's that 50 volt 20 amp supply 
>> that's a killer!

Actually,  this voltage/current is very easy to come
by, and relatively low in  cost.  The telephone
industry uses this voltage and at high currents.  



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The only point to be careful of is that yes, telecoms do use 48V though  with 
+ve ground.
You have to ensure that the supply is not tied to ground inside the  PSU.
 
That said there are plenty of suitable 115AC to 48V PSU (mainly  switched 
mode) used with PABX systems that should be available on the surplus  market as 
there has been a large turn over of the older analog telephone  switches for 
the digital type.
 
Bob, G3VVT