[AMRadio] High Voltage Power Supplies


Edward B Richards zuu6k at juno.com
Sun Oct 30 11:02:47 EST 2005


Maybe you need a higher PIV rating for your diodes. Should be at least 10
kv.

73, Ed Richards, K6UUZ
Simi Valley, California, 93065
Home of Air Force 1 Pavilion

On Sun, 30 Oct 2005 09:08:11 -0500 "Ed Swynar" <gswynar at durham.net>
writes:
> 'Morning All,
> 
> I'm curious as to why I have to replace the silicon diode strings in 
> my 2500 VDC power supply about every 8-10 years, or so...I just went 
> through the exercise again early this morning --- turned on the B+ 
> to my 2 x 813 linear, & got nothing back for my trouble but smoke 
> from inside the enclosed p.s. unit...
> 
> Opened it up, & the resistor across the relay in my time delay 
> circuit --- transformer primary side --- was fried. I checked the 
> conductivity of both legs of my diode string (it's a full-wave 
> set-up), & sure enough, one leg was A-OK, but the other displayed 
> conductivity on BOTH sides of each diode...not good.
> 
> Is this the reult of transients / voltage spikes somehow 
> "overwhelming" the diodes...? 
> 
> It used to be more frequent prior to the incorporation of the delay 
> circuitry --- but, despite its presence, this HAS to be at least the 
> second time that a re-build was in order.
> 
> Any thoughts re. a dose(s) of possible "preventative maintenance" 
> for the future...? I'm at a loss as to anything else here that I 
> might try...
> 
> Thanks in advance...
> 
> ~73!~ Eddy VE3CUI - VE3XZ
> 
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