Help needed for active filter

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k1jroth

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Joined 2004
Hello

I designed active filter for my subwoofer and have two probmles with it.


When i turn phase potentiometer (100k) amplitude drops and as far as i know it should not do that.

Even bigger problem is that when i turn phase switch (text PHASE SWITCH between two pads) opamp starts to oscillate with frequency of 1,5Mhz.

Could someone smarter check schema if there is some kind of mistake that i don`t see.

Please help beginner.
 

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