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A different way to reduce common mode noise,

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May 26th 07, 07:27 PM posted to rec.radio.shortwave

Telamon

Telamon is offline

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First recorded activity by RadioBanter: Jul 2006

Posts: 4,494

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A different way to reduce common mode noise,

In article . com,
wrote:

The incoming AC mains power is bypassed with
parallel 0.01uF and 0.001uF(1000pF) 2KV low
inductance capacitor. We also have a "whole house"
over voltage clamp at the breaker panel.

Every light switch has a 0.001uF cap across the
contacts.

Snip

You should only use specially rated capacitors for this type of
application. You understand that a capacitor on the mains supply draws
current to heat the dielectric as a consequence right?

You should also have a fuse of circuit breaker between it and the mains
supply in case it shorts. The lamp cord is not rated to what the house
circuit breaker rated at of course.

Here is the skinny on the subject.
http://my.execpc.com/~endlr/line-filter.html

He also describes a snubber network, a series resistor and capacitor
that is a good way of suppressing switch noise from rectifying diodes in
power supplies. The diode switch noise on power supply DC outputs causes
the hum on portable radios.

--
Telamon
Ventura, California

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