White noise is real but in an amp with RX/TX relay isolation you wont hear
it and it may not occur with big diodes.
It is noticable with SS receiving and audio gear and a single .01 or so
bypass across each leg of the rectifier takes care of it.
I like to add a single .0047 across the full string in an amp and another at
the output to ground to keep any high intensity and transformer stretched
spikes from bothering the diodes or electrolytics. The one to ground also
catches any stray RF that the plate choke or its bypass missed.
Carl
KM1H
----- Original Message -----
From: "Jim Barber" <audioguy@charter.net>
To: "AMPS" <amps@contesting.com>
Sent: Saturday, October 30, 2010 4:32 PM
Subject: [Amps] HV rectifier strings - to bypass or not?
> I'm getting ready to lay out the HV rectifier board for my YC156
> project, and it occurs to me to wonder if anyone has ever really heard
> HV rectifier "white noise" in the receiver? It would be simpler to
> forget about the per-diode bypass caps and just bypass the output as it
> leaves the board. The supply will be housed in a separate cabinet from
> the RF deck, but connected of course with bypassed leads for HV, (SHV
> connectors) 110VAC and control signals.
>
> My current intent is to use 8 6A10 diodes per leg. The transformer is a
> 3KV, 2A CCS Peter Dahl and the filter is 32uF by means of two new 16uF
> 7500V oil-filled caps from Henry Radio via eBay.
>
> Opinions?
>
> Thanks,
> Jim N7CXI
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|