2 Pole High Pass Filter

2 Pole High Pass Filter with Gain

3 Pole High Pass Filter

24dB Linkwitz High Pass 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.

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2 Pole Active High Pass Filter

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

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2 Pole Highpass Active Filter with Gain

Input	Calculated Values
Filter Type : Butterworth Chebyshev 0.1 dB Bessel Capacitor C1 : uF 3dB Cutoff Freq : Hz Voltage Gain : Vu	R1 = kΩ R2 = kΩ C1 = uF nF C2 = uF nF C3 = uF nF Amplification = dB

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3 Pole Active High Pass Filter

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

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Linkwitz High Pass Filter 24dB

Unity Gain in the Passband, 24 dB / Octave, 2 x 2nd order

Input	Calculated Values
Cutoff Freq. : Hz C : nF	R1 = kΩ R2 = kΩ R3 = kΩ R4 = kΩ

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