These would be the so called 'snubbing' capacitors, I think. They are
supposed to reduce ringing of the LC circuit when the diode switches.
(L = transformer winding, C = filter capacitor). I've seen lots of
folks arguing about whether they make any difference. I have never
found any difference, so I don't use them. Some folks say that an RC
network, or just a resistor, works better than a capacitor.

Neil

On 11/20/05, Wouter van Ooijen <wouter@voti.nl> wrote:
> In circuits I sometimes see capacitors over each of the fout diodes in a
> diode bridge. What is the prurpose and effect of these capacitors? I
> recently tried to help a client get rid of some interference problem and
> these capacitors turned out to do a good job. But I would like to know
> exactly (if possible) why?
>
> Wouter van Ooijen
>
> -- -------------------------------------------
> Van Ooijen Technische Informatica: www.voti.nl
> consultancy, development, PICmicro products
> docent Hogeschool van Utrecht: www.voti.nl/hvu
>
>
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