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Active_Notch_Filter.php 12412 Bytes 04-03-2025 19:09:14
Active Twin - T - Notch Filter Calculator
• 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 [%].
• 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 !
Parts used in Simulation :
R1 = R2 = 318.3 kΩ
R3 = 159.2 kΩ
C1 = C2 = 10 nF
C3 = 20 nF
R4, R5 : various values
OPAMP: LM358
Active_Notch_Filter_2.T3001
NOTE: Even the Simulations suggest Attenuations of 100 dB and more, real - life values are in the range of 40 ... 60 dB !
Parts used in Simulation :
R1 = R2 = 318.3 kΩ
R3 = 159.2 kΩ
C1 = C2 = 10 nF
C3 = 20 nF
R4, R5 : various values
OPAMP: LM358
Active_Notch_Filter_2.T3001
 |
k = 99 %
R4 = 1 kΩ R5 = 99 kΩ B = 2 Hz Depth : 78.2 dB 122.9 mV |
|
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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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t1 = 7299 d
t2 = 281 ms |
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