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

[Gary Schafer]

Why not? The output of the rectifiers provide some mighty spikes of their
own. The capacitors handle it just fine.

73
Gary  K4FMX

> -----Original Message-----
> From: Carl [mailto:km1h at jeremy.mv.com]
> Sent: Saturday, October 30, 2010 8:44 PM
> To: garyschafer at comcast.net; 'Jim Thomson'; amps at contesting.com
> Subject: Re: [Amps] HV rectifier strings - to bypass or not?
> 
> You dont want intense line spikes going thru electrolytics.
> 
> Carl
> KM1H
> 
> 
> ----- Original Message -----
> From: "Gary Schafer" <garyschafer at comcast.net>
> To: "'Jim Thomson'" <jim.thom at telus.net>; <amps at contesting.com>
> Sent: Saturday, October 30, 2010 9:28 PM
> Subject: Re: [Amps] HV rectifier strings - to bypass or not?
> 
> 
> > 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 at contesting.com [mailto:amps-bounces at contesting.com]
> On
> >> Behalf Of Jim Thomson
> >> Sent: Saturday, October 30, 2010 7:58 PM
> >> To: amps at 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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