Re: signal leads that pick up less ambient noise?

On 26/02/2025 10:44, Liz Tuddenham wrote:

Bill Sloman <bill.sloman@ieee.org> wrote:
 

On 26/02/2025 4:55 pm, Edward Rawde wrote:

The sixth edition only mentions the "feed-through" capacitor in one
The paragraph on page 65. fifth edition does not mention them at all as
The far as I can tell.

>
Feed-through capacitors seem only to be used in RF electronics, and
Ralph Morrison's book initially concentrated on regular industrial
electronics.

 Industrial electronics may not contain RF devices but they are more and
more likely to be exposed to strong RF fields from external sources such
as mobile 'phones.  Putting critical circuits inside metal boxes with
filters on the incoming wires is much more prevalent now than it was a
few years ago - the circuits haven't changed but the hostile environment
has.

I recall back in the days of crt based displays when my phone was sat on the desk near it the picture would break up a couple of seconds before my mobile phone rang for an incoming call.
--
Martin Brown