Re: From Member: using Digital Equipment Corp Transformers

Wreno Wynne wrote:

> The capacitor also helps smooth the power from the transformer and can
> help reduce RFI and EMI. It is pretty common to add capacitors to all
> sorts of power supplies in electronics.
>

NO! The specific capacitor in question has nothing to do with smoothing
the DC output, in this specific case.
There will be another capacitor, in this case an aluminum electrolytic,
for that purpose. The OP was clearly asking about an oil-paper cap, and
that tells me this had a ferroresonant regulating transformer. If you
didn't work on "business equipment" and minicomputers back in the 1960's
and early 1970's you won't have run into these beasts.

Jon