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resonance for a108 when feeding 24db output into feedback input?

2006-05-30 by marrtin606

Hi,


This is my first post here - I've been lurking around for a couple of
weeks, bascially since i got my 4-row a100 setup. I followed an
earlier advice of Dieter and got one of those cheap voltcraft scopes,
which has helped me a lot for understanding already most of the more
subtle features and quirks of the system.

I was wondering if anyone of you has been succesfull to get the a108
to work as an 'ordinary' 24 db filter with '24db' resonance. When I
hook up the 24db output to the feedback input, I can't get even close
to self-oscillation. Inserting a polarizing amp (138c, so as to be
able to change the phase) doesn't really do the job, but can get the
108 into some evil low freq oscillations when polarity is reversed.
Great fun all, but why can't I get resonance in 24db mode? I find the
48db resonance ok, but was curious to be able to get other, somewhat
milder resonance behaviors.

Cheers, Martin

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