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Chip Amps Amplifiers based on integrated circuits

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Old 23rd February 2005, 03:14 PM   #1
k1jroth is offline k1jroth  Finland
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Default Help needed for active filter

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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