[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
unloaded. 

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.

Pat
wa4tuk


-----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:

http://n1ese.qrpradio.com/tranny.jpg

Thanks

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