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Chip Amps Amplifiers based on integrated circuits

Amp pick up interference
Amp pick up interference
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Old 13th October 2018, 07:15 PM   #11
tomchr is offline tomchr  Canada
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Quote:
Originally Posted by Hicoco View Post
Click the image to open in full size.49 views but nobody answer.....!!!!!!
May be no one have been this trouble before!!!!!! or this thread does not have any interest...thanks anyway for the click on the link
Could also be that your question is a bit vague to start. Or that the first 49 viewers weren't able or available to help.

As others have asked: What kind of interference are we talking about? How's it getting into your circuit? Do you know for sure that the interference is getting in through the cabling?

If the interference does get in through the cabling, an RC or LC filter at the input often helps. You'll want a cutoff frequency of 200 kHz or higher to prevent any impact within the audio band and you want as much attenuation at RF as you can get.
The common 100 Ω + 100 pF RC filter has a cutoff of 15 MHz, which is generally not enough to provide meaningful attenuation of interference sources. Something like 100 uH + 100 pF would probably work. Depending on the ESR of the two components (mainly the inductor) you might have to add a little series resistance to tame the resonant peak of the circuit.

If, on the other hand, your RF interference is radiated into the circuit, shielding is your friend.

Hope this helps.

Tom
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Old 13th October 2018, 07:57 PM   #12
Hicoco is offline Hicoco  France
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Originally Posted by MAAC0 View Post
Hicoco


First of all .. What kind of Interference are we talking about ??
PSU Hum, Radio, TV, Cellphone, Buzz ??
Cellphone cable, i followed FauxFrench recommendations and no more interferences...Thank to all, helped a lot
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