2 Pole Low Pass Filter

2 Pole Low Pass Filter with Gain

3 Pole Low Pass Filter

24dB Linkwitz Lowpass Filter

Active filter design precautions When building the active filter circuit, high tolerance components must be used to obtain the best performance. Typically they should be 1% or better. A further item to ensure the optimum operation of the circuit is to ensure that the source impedance is less than about 100 ohms. Additionally the load impedance should be greater than about 2 M Ohms.

More info about Active Band Pass Filters can be found  here  or  here  or with the help of  Google

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2 Pole Low Pass Filter

Input	Calculated Values
Filter Type : Butterworth Chebyshev 0.1 dB Bessel Resistors :  kΩ 3dB Cutoff Freq :  kHz	R1, R2 =  kΩ C1 =  uF nF C2 =  uF nF

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2 Pole Lowpass Filter with Gain

Input	Calculated Values
Filter Type : Butterworth Chebyshev 0.1 dB Bessel Resistor R1 : kΩ 3dB Cutoff Freq : kHz Voltage Gain :	R1 = kΩ R2 = kΩ R3 = kΩ C1 = uF nF C2 = uF nF Amplification = dB

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3 Pole Low Pass Filter

Input	Calculated Values
Filter Type : Butterworth Chebyshev 0.1 dB Bessel Resistors : kΩ 3dB Cutoff Freq : kHz	R1, R2, R3 = kΩ C1 = uF nF C2 = uF nF C3 = uF nF

 

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Linkwitz Lowpass Filter 24dB

Input	Calculated Values
Cutoff Freq. : kHz R : kΩ	C1 = nF C2 = nF C3 = nF C4 = nF

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