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VARIABLE_Q_FILTER_FOR_400_Hz

2017-02-23 14:51  
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VARIABLE_Q_FILTER_FOR_400_Hz
A bootstrapped twin T notch filter in this circuit can yield an effective Q of up to 10. RS adjusts the feedback, hence the Q. Values of C1 and C2 can be changed to alter the frequency. RF is a fine-tune null control.