low voltage high current heater supplies
dear all
I am playing with some 813's at the moment. I am trying to get the
heater supply sorted out.
the 813 needs 10v at 5 amps, the do glow v. bright when lit up.
pretty neat.
I have a breadboard amp going at the moment which someone else has
given me.
The current heater supply uses a 20 odd volt ac transformer, bridge
rectiifer, feeding a 2n3055 based regulator, thing is putting out
about 50watts in heat. as it is stereo there is 100w in heat being
generated.
whenever i model a 5 amp 10V heater supply in PSUD i get some really
whacky readings, ie.
28V transformer to feed 100,000u cap, with a 0.5ohm resistor, then
1000u cap into the tube. ie. 2 ohm load,
or am i missing something here, 28V ac seems a long way away from 10v
dc, or is this an artifact of the high current pulsing away and
charging the caps?
I wanted to build a dc supply that does not generate so much heat in
itself.
any thoughts, ideas etc. especially the printable ones would be
greatly appreciated.
kind regards
bill ramsay.
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