Original message below:
From: Steve Jackson <
[hidden email]>
Subject: [Elecraft] 48V, plus or minus, usually
>> It's that 50 volt 20 amp supply
>> that's a killer!
Actually, this voltage/current is very easy to comeby, and relatively low in
cost. The telephone
industry uses this voltage and at high currents. Surplus is readily
available, and often at prices less
than the per-watt cost of a 13.8V high current supply. KS4VA often has such
supplies at his commercial
website www.valuesurplus.com ...
Those looking for 48 volt supplies should note that the telephone company
uses -48 volts with the positive teminal grounded and the negative side hot.
Many times the internal circuitry of these power supplies cannot be
rearranged to provide +48 VDC as the hot side. It is better to look for
units that have isolated outputs. Buyer beware Just my $0.02 worth.
Rich, W3ACO
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