R. Foote wrote:
(Scott Dorsey) wrote in message ...
Eric K. Weber wrote:
I have not looked at their full catalog to see if they have models which
don't use a standard 120VAC DIN power connector.... the 120VAC ones would
work fine, but I would not use one with a connector that would encourage
accidental application of 120VAC...

They have a bunch of them that have solder leads rather than an IEC
entry.

But, on a DC power line, there are other alternatives. Even a big pi
filter may be an improvement.

This is AC we're talking about... The secondary of my transformer is
at 16-20 VAC. I will use a corcom filter on the 120VAC side but use a
.01 bypass on the single secondary.

That's a start. You might consider using a transformer that is specifically
designed for high RF rejection and good isolation between primary and
secondary, like a medical-grade transformer.

Also, maybe you guys coild explain a little more about rf bypass on
the inputs. Should I put the .001 uf caps right at the XLR input
connector? Then the beads on the wire? You wouldn't put the bypass on
the PCB, would you?

Sure, you could put them on the PCB, though you'd have to be careful about
layout. But the first line of defense for RF rejection is good grounding,
and the second line is a good quality power transformer.

When in doubt, borrow a VHF walkie-talkie and test it out. Two or three
watts on 2M or on an itinerant business-band frequency, right near the case,
will tell you a lot about RF rejection. Then plug it into a circuit with
a touch lamp right next to it.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."