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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

    Jbanneck

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    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? http://astro.u-strasbg.fr/~koppen/radio/Activee.html

    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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