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 [%].
Simulations :
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 !
k = 99 %
R4 = 1 kΩ
R5 = 99 kΩ
B = 2 Hz
Depth : 78.2 dB
122.9 mV
k = 90 %
R4 = 10 kΩ
R5 = 90 kΩ
B = 20 Hz
Depth : 97.2 dB
13.8 mV
k = 80 %
R4 = 20 kΩ
R5 = 80 kΩ
B = 40 Hz
Depth : 103 dB
7.16 mV
k = 70 %
R4 = 30 kΩ
R5 = 70 kΩ
B = 60 Hz
Depth : 106 dB
4.79 mV
k = 60 %
R4 = 40 kΩ
R5 = 60 kΩ
B = 80 Hz
Depth : 109 dB
3.58 mV
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