[Amps] -48 Volt Switching Power Supplies

[HAROLD B MANDEL]

Dear Friends,

Before running off and making a cash offer on a surplus -48 Volt
switcher supply from a telecom location please consider that
it may or may not be working.  It takes an Act of Congress
to get these replaced, and the one thing that qualifies for
replacement is when the magic has gone out when the
white smoke came out the top.

Additionally, many of these units operate from 240 volts
a.c., single-phase, of course, so hook up with care.

Additionally, many of these units connect to a controller
in the power plant that controls the output voltage and
without a controller will not emit.

Additionally, several models need to be connected
to a string of battery cells before turning on any
D.C. output. This is called the Reference Voltage
and when a string of rectifiers are operated in
parallel the common  battery plant enables the
central and rectifier controllers to adjust the
float voltage to a few hundredths of a volt
regulation.

If you have any questions or find something
looking promising, please don't hesitate to 
give me a shout.

Hal Mandel
W4HBM