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Bainter Notch Filter Calculator

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• The Q of the circuit depends only on the Gain of the OPAMP
• Notch-depth does not drift with temperature. Tuning with R6
• Easy shifting of Frequency by changing R1
• Lowpass (R4>R3), Notch (R4=R3) and Highpass (R4<R3) characteristic is possible.
• Maybe helpful : find parallel resistors

   Active filter has stable notch and response can be regulated
   Analog Devices Mini Tutorial No 203

Circuit Diagram :

Calculations :

Center Frequency		[Hz]
Q
C1, C2		[nF]
R1, R2		[Ω]
R3, R4		[Ω]
R5, R6		[Ω]

Transfer Function :

Simulations :

Simulations were done using TARGET 3001. Center Frequency : 1000 Hz

Parts used in Simulation :

OPAMP: LM358

Bainter_Notch_Filter.T3001

		R1,R2 = 1 kΩ  R3,R4 = 79.58 Ω  R5,R6 = 31.8 kΩ  C1,C2 = 100 nF  Q = 10  B = 100 Hz
		R1,R2 = 1 kΩ  R3,R4 = 159 Ω  R5,R6 = 15.9 kΩ  C1,C2 = 100 nF  Q = 5  B = 200 Hz
		R1,R2 = 1 kΩ  R3,R4 = 397.9 Ω  R5,R6 = 6366 Ω  C1,C2 = 100 nF  Q = 2  B = 500 Hz
		R1,R2 = 1 kΩ  R3,R4 = 795.8 Ω  R5,R6 = 3183 Ω  C1,C2 = 100 nF  Q = 1  B = 1000 Hz

✈ Share your thoughts

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