You can find computer capacitors of 1000uF/200V at about$2 per copy 2 in
series,as used in PC supplies mace for 500uF/400VDC caps. How many pairs do
you need?
Alex 4Z5KS
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Paul Decker
Sent: Wednesday, April 01, 2009 1:46 PM
To: amps@contesting.com
Subject: [Amps] hv smps
Hi Jeff,
Just so you know, most of that power supply schematic is lifted from Tim
Hulick W9QQ, and the RF deck is lifted from Dick Stevens W1QWJ.
I'm not sure it really turns out any cheaper, the core material alone is
about $100 and if you don't have any hv wire, and sorts, that can add up
pretty quick. I was lucky enough to find some power mosfets on ebay , but
pricing them new was about $10 each. Add in a big filter cap on the
primary $35, then the high speed secondary rectifier diode strings about
$40.
For me, it was more about reducing the weight, I thought the 8 pound
transformer and associated circuits would be neat. The other part for me
was that it would be a very intensive learning experience, building and
working through the circuit in detail, winding the transformer and working
with square waves, and other such none sense .
Paul, kg7hf
>>Given a decent 2KW TX alone can set easily set a guy back $400 or so, a
>>switching power supply seems the natural evolution for tube amps. But
I' >> ve not seen a switcher in a tube amp yet.
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