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Active Filter Applet by Joachim Köppen

Discussion in 'Microcontrollers, Programming and IoT' started by Jbanneck, Jan 31, 2010.

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  1. Jbanneck


    Sep 27, 2009
    I have tried to use the active filter applet by Joachim Köppen. When I used the suggested values to design a 2 pole Chebychev 1 dB ripple low pass filter the cut off frequency was 40Hz not 80Hz as expected. This was confirmed in 2 actual circuits. The values provided by the applet were:
    C1 and C2 = 100nf
    R1 = 44.13K
    R2 = 12.06K

    Does anyone have any experience with this applet?

    It is great as you can specify equal values of either the caps or resistors as well as the type and number of poles in the filter. I have not seen any other applet llike it on the net. To bad it does not seen to work. Any ideas?
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