• Suiteable to attenuate a 50 Hz ( 60 Hz ) noise
• Select parts with low tolerance / equal value !
• Design of this calculator was inspired by : Ferdl
• Maybe helpful : FIND PARALLEL RESITORS
With passive networks, the Q is fixed to 0.25 - introducing a variable Feedback 'k' allows the Q to be adjusted.
Changing the Q will also change the notch-depth. For numerical reasons,
we limited the range of k : 1 < k < 99 [%].
Circuit Diagram :
Transfer Function :
Simulations were done using TARGET 3001. Center Frequency : 50 Hz
NOTE: Even the Simulations suggest Attenuations of 100 dB and more, real - life values are in the range of 40 ... 60 dB !