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Chip Amps Amplifiers based on integrated circuits

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Old 17th April 2017, 11:25 AM   #751
AndrewT is offline AndrewT  Scotland
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C6 & C8 can be any size from 100uF to 1mF
C5 & C7 must be located very close to the chipamp power pins and must have a low loop area back into the Zobel Return and Speaker Return.
C1 must be your input high pass filter.
Be careful that it limits the signal that C3 needs to handle. There should be zero AC voltage across C3, if it is to do it's DC blocking job properly.
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Old 17th April 2017, 08:58 PM   #752
otc is offline otc  Denmark
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Quote:
Originally Posted by AndrewT View Post
C6 & C8 can be any size from 100uF to 1mF
C5 & C7 must be located very close to the chipamp power pins and must have a low loop area back into the Zobel Return and Speaker Return.
C1 must be your input high pass filter.
Be careful that it limits the signal that C3 needs to handle. There should be zero AC voltage across C3, if it is to do it's DC blocking job properly.
Thank, You. I get Your points.
Specifically I read the thread about Prof. Cherry's LF phase-correction in the feedback loop and understand that C1 in my circuit can not go higher in value, it is mandatory in the circuit to cut LF at same or a higher frequency than C3. So will only use value 0,47 uF or maybe smaller, but different types of film-caps.
I suppose the Prof. Cherry phase-correction is audible and not just measurable?
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Old 18th April 2017, 07:31 AM   #753
AndrewT is offline AndrewT  Scotland
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I think it is audible. But maybe I am being fooled.
It does create a small hump in the response just before the roll-off. Maybe that is more audible than the phase correction.
I consider the input filter as mandatory to remove that LF hump.
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