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Old 22nd April 2012, 02:44 AM   #11
Bonsai is offline Bonsai  England
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That is a very nice article you have written there djoffe. Thanks for sharing your insights.
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Old 22nd April 2012, 06:26 AM   #12
Mooly is offline Mooly  United Kingdom
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Installing and using LTspice. From beginner to advanced.
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Old 22nd April 2012, 12:03 PM   #13
djoffe is offline djoffe  United States
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Thanks for the kind words....
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Old 25th April 2012, 09:22 AM   #14
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+1 from me as well
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Old 26th April 2012, 08:15 AM   #15
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Hi again,

And thanks once more for sharing your knowledge and insights. I've read up on what you've suggested and have decided on star-grounding in two different places (there are two units) - similar to what is suggested in djoffe's article.

Also, depending on how noisy things become I'll put a copper shield around the interconnect wires and not distance the wires too much from eachother - inspired by the small loop area recommendation in the "HAM" article on RFI shielding.

Also, inspired by one of Bonsai's posts in one of the links you gave, I'll experiment with having the ground and supply wires, e.g. to filter caps lie close to eachother.

I have a question, though: One part of this "preamplifier" really is a microphone with adjacent circuitry, the other part is an A/D converter. All is battery powered, i.e. one battery pack near the microphone(s), another at the A/D converter. If I place a shield around the wires connecting the two parts where would then be the most feasible place to put the connecting point for this shield?

I reckon the shield would pick up high frequency noise e.g. from mobile phones etc., and my own impulse is to connect it directly - through an efficient ferrite bead - to the star ground on the A/D converter's supply and then make sure that this supply is very well filtered high-frequency wise. This already is HF area, and the microphones are very low and volatile signal levels. Does this make sense?

Insights appreciated

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