Are you telling us that you see power line transients across the output of
your 3000 volt power supply?
73
Gary K4FMX
> -----Original Message-----
> From: Carl [mailto:km1h@jeremy.mv.com]
> Sent: Saturday, October 30, 2010 9:15 PM
> To: garyschafer@comcast.net; 'Jim Thomson'; amps@contesting.com
> Subject: Re: [Amps] HV rectifier strings - to bypass or not?
>
> What mighty spikes? What is the rise time, duration and PRR?
>
> Have you actually watched a 3000-5000VDC PS on a scope?
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "Gary Schafer" <garyschafer@comcast.net>
> To: "'Carl'" <km1h@jeremy.mv.com>; "'Jim Thomson'" <jim.thom@telus.net>;
> <amps@contesting.com>
> Sent: Saturday, October 30, 2010 9:51 PM
> Subject: RE: [Amps] HV rectifier strings - to bypass or not?
>
>
> > 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@jeremy.mv.com]
> >> Sent: Saturday, October 30, 2010 8:44 PM
> >> To: garyschafer@comcast.net; 'Jim Thomson'; amps@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@comcast.net>
> >> To: "'Jim Thomson'" <jim.thom@telus.net>; <amps@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@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.
> >> >>
> >> >
> >> > _______________________________________________
> >> > Amps mailing list
> >> > Amps@contesting.com
> >> > http://lists.contesting.com/mailman/listinfo/amps
> >
> >
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