On Thursday 06 February 2025 07:20:36 am wn4isx via groups.io wrote:
Note 3 should read
Add a 0.01uF capacitor with a 27~33 ohm resistor in series across each power rectifier to minimize commutation EMI [radio noise].
I've seen some stuff out there that puts a cap across rectifier diodes, sometimes just two out of the four, not sure why they'd do that. I also used to see a cap across the AC line, or a series-connected pair of them. Nowadays it's commonly part of an EMI filter, with multiple parts, common mode choke, etc.
Speaking of which, I threw a bunch of that stuff into a box I've labeled "line filters". They seem to use a lot of different values for caps, and I have no idea how to determine what's a reasonable amount of current you can put through one of those coils. Any thoughts on that?
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
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Information is more dangerous than cannon to a society ruled by lies. --James
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