[sdiy] digital potentiometers as "volume" control

[Jay Schwichtenberg]

Couple of things to think about.

Are they linear, log or expo. linear = cv, log = volume, expo = freq

Depending on the design of the filters the caps you use to get rid of the
zippering may also effect the freq response.

Jay S.



-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of Tom Haber
Sent: Tuesday, July 24, 2007 8:56 AM
To: SynthDIY
Subject: [sdiy] digital potentiometers as "volume" control


Hey all,

I'm currently designing a filter bank. The idea was to have 2 filters that
can be placed
in serial or parallel or anything in between.

To allow full flexibility, it has 6 potentiometers.
http://research.edm.uhasselt.be/thaber/junk/filter.png (the boxes are the
filters)

Are digital potentiometers a good way to accomplish this? The filters are
controlled using
multiplying D/A converters with filtering caps to counter zippering.
Obviously zippering is
an issue with the potentiometer approach.

Are there different solutions?

Regards,
Tom Haber


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