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Re: [Amps] HV rectifier strings - to bypass or not?

To: "'Jim Thomson'" <jim.thom@telus.net>, <amps@contesting.com>
Subject: Re: [Amps] HV rectifier strings - to bypass or not?
From: "Gary Schafer" <garyschafer@comcast.net>
Reply-to: garyschafer@comcast.net
Date: Sat, 30 Oct 2010 20:28:46 -0500
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Why place a capacitor across each diode string on a full wave bridge? The
filter capacitor is always across the transformer secondary.

73
Gary  K4FMX

> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Jim Thomson
> Sent: Saturday, October 30, 2010 7:58 PM
> To: amps@contesting.com
> Subject: [Amps] HV rectifier strings - to bypass or not?
> 
> 
> ##  KM1H  came up with a better method... and that's to install one HV
> disc ceramic
> across each leg.....so 4 x caps in all.    The purpose of these 4 x caps
> is to  bypass any
> junk/transients coming in off the street. Of course the V rating has to be
> high if a single
> cap is used.  You can get disc ceramic caps in 4700 pf @  10/15 kv
> variety.  [ Ceramite brand,
> sold by mouser+ henry radio still has em].   IF  .01 uf caps [10,000 pf]
> installed across each diode,
> and 8 x diodes used, you only have 10,000/8 =   1250 pf  effectively
> across each leg.  If individual
> caps used, .02uf @ 1 kv would be better.    IMO... 4 x big caps, one per
> leg, is more effective, and
> messier than 32 x  caps.
> 

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