inductor ladder
mbartkow at ET.PUT.Poznan.PL
mbartkow at ET.PUT.Poznan.PL
Fri Mar 26 12:27:46 CET 1999
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Hello all,
this is my first post on this list, although I am a subscriber for several months
and a read carefully all the posts. I am an EE with some experience in synth diy.
The discussion about inductor-based filters brought me a thought. I think that
building a hp filter that has an identical structure to classic lp moog ladder
is just missing the point. Highpass filter may be set up using capacitors in
a horizontal ladder, as drawn by Bob (attached to this E-mail).
The attractiveness in using inductors is in their nonlinearities which can bring
a new sonic quality. Since component imperfections are mostly responsible for the
variety of sound character various filters have, and we all love them, it would
be desirable to develop a *lowpass* filter that pushes the inductors to a state,
where some saturation and even hysteresis occur. This might be achieved by using
ferrite-based inductors and maybe some DC bias. Btw, a state-variable structure
employing inductor-based integrators might be interesting as well.
regards,
--
Maciej Bartkowiak
========================================================================
Institute of Electronics and Telecommunication fax: (+48 61) 8782572
Poznan University of Technology phone: (+48 61) 8791016 int.171
Piotrowo 3A email: mbartkow at et.put.poznan.pl
60-965 Poznan POLAND http://www.et.put.poznan.pl/~mbartkow
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end
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