[AMRadio] WTB: HV Tranny

Patrick Thompson wa4tukhr at gmail.com
Thu Feb 7 20:11:45 EST 2008

An old trick was to use a single voltage transformer, say 350 CT, using a
full wave bridge for the high voltage and the center tapped output for the
lower voltage. For instance 350x1.4=490vdc unloaded and (350/2)x1.4=245 vdc

You may be happier with a higher transformer voltage and a choke input for
the lower voltage. Depends on how critical the load is. If you don't find
exactly what you are looking for this may give you other choices.


-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of JT Croteau
Sent: Wednesday, February 06, 2008 8:23 AM
To: Discussion of AM Radio in the Amateur Service
Subject: [AMRadio] WTB: HV Tranny

Looking for a high voltage tranny with 115V Primary and secondary
tapped for both 400V and 700V along with a CT.  I may have to go with
separate HV trannies but I'd rather not if possible.  Power supply I
am building produces 230VDC @ 80ma and 475VDC @ 170 ma.  Please reply
direct, jt.n1ese at gmail.com

Schematic of tranny in case I am not describing it properly:



JT Croteau, N1ESE - Manchester, NH (FN42gx)
Contest Manager, TARA Skirmish
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