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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: signal leads that pick up less ambient noise?
Date: Tue, 25 Feb 2025 13:21:24 -0500
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"Christopher Howard" <christopher@librehacker.com> wrote in message news:871pvlsz2s.fsf@librehacker.com...
> Bill Sloman <bill.sloman@ieee.org> writes:
>
>> On 25/02/2025 4:46 am, Christopher Howard wrote:
>>>> Google for coaxial feed through capacitors.
>> Capacitors and resistors don't ring. Adding inductance can introduce
>> ringing. but enough resistance can make the resonant circuit
>> critically damped and the voltages and current will decay
>> monotonically.
>
> So, when you use a coaxial feed through capacitors on your faraday cage,
> do you add a resistor right after the capacitor, to reduce/eliminate
> ringing? Or are you just trying that all your inputs on the board have
> resistors before whatever op amps or other components that they feed
> into?

Start with only feedthrough capacitors which have a capacitance to ground which it not going to have any detrimental effect on your 
circuit.
Don't worry about ringing at this stage.
If you still have issues with unwanted signals being conducted in or out of the cage then additional filtering such as a series 
resistor or a more sophisticated filter may be needed.
But in your case I would not worry about that until after I had determined whether or not a problem still exists with only 
feedthrough capacitors in place.

>
> -- 
> Christopher Howard