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.
>>
>
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