[sdiy] Re: Dopfer filter

[Norbert Kleiber]

Hi !

Theres NOTHING special on dopfer filters.
A120 : Moog cascade, nothing more
A121 - A 123 : CEM 3320 based, just read the datasheets for the chip
A124 : WASP Filter : ask Jürgen Haible, HE "digged" it out (or look at his
HP)
A103 : Tony Allgoods TB3030 filter is MUCH MUCH better !!!!!!
A104 : Not very useful : much better to built four 12 dB Bandpassfilters,
then you
       can change the Frequency per Voltage too, not only manually.
A105 : look at Tony Allgoods multi ladder filter, SAME functionality !!!!!!

Norbert

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