## 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.

<<< Back to Lowpass, Bandpass and Highpass Filter Calculators

## Calculated Values

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

<<< Back to Lowpass, Bandpass and Highpass Filter Calculators

## 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

<<< Back to Lowpass, Bandpass and Highpass Filter Calculators

## 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

<<< Back to Lowpass, Bandpass and Highpass Filter Calculators

## Linkwitz High Pass Filter 24dB

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

## Calculated Values

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

<<< Back to Lowpass, Bandpass and Highpass Filter Calculators