Agreed.
Jim W7RY
On 12/12/2022 12:32 AM, MU 4CX250B wrote:
Hi Tim,
I’ve followed this debate for years and frankly I don’t think adding
.01uF caps across each diode in a diode string makes much difference
one way or the other. It’s true that there will be some suppression of
fast current and voltage transients, but these aren’t likely to cause
damage to modern components. To me the downside of the practice is
that adding 0.01uF caps results in additional opportunities for
capacitor failures, loose solder connections, unsightly wiring, and a
bunch of extra components that provide minimal benefits. I’m inclined
to leave them out. (BTW, one commenter suggested that sharp voltage or
current spikes wouldn’t make it through the filter capacitors. That’s
untrue because the filter caps have a self inductance that keeps them
from filtering spikes with high frequency components. )
73,
Jim W8ZR
Sent from my iPhone
On Dec 11, 2022, at 7:03 PM, Tim Duffy <k3lr@k3lr.com> wrote:
W8ZR Jim
Can you give advice on this topic?
73
Tim K3LR
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of jim.thom
jim.thom@telus.net
Sent: Tuesday, November 29, 2022 2:28 PM
To: amps@contesting.com
Subject: [Amps] .01uf caps across diodes ?
What's the consensus on wiring .01uf disc caps across diodes in a HV supply
?
W8JI sez they are required, and used in ameritron amps....and used to
eliminate switching transients.
Some say the caps are required to meet emc specs on commercial gear.
I can't see how anything can get past the HV fitter caps.
KM1H also uses caps across diodes. He also used another method, with a
.01uf cap across an entire series string of diodes, like a .01uf @ 5 kv
type.
Orr's books recommend caps across diodes... to eliminate noise on TX on
ssb. .
Are they required...or not ?
Jim VE7RF
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Thanks and 73, Jim W7RY
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