[sdiy] What sort of filter is this?

[George Hearn]

A Baxandall Tone Control Circuit has two knobs, one bass "cut-neutral-boost"
and one "treble-neutral-boost".  If you were to use a dual-gang
potentiometer you could connect it such that at one end you have bass cut &
treble boost, in the middle you have neutral-neutral and at the other end
you have bass boost/treble cut. This would achieve the desired effect but
would boost the other when one was cut, however this might be useful.
George

An example Baxandall circuit can be found at:
http://sound.westhost.com/dwopa2.htm


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Mike Beauchamp
Sent: 08 January 2010 14:04
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] What sort of filter is this?

Excuse me if I get a few of the terms wrong here, but what sort of
filter is neutral at it's middle position and then a high-pass and
low-pass filter on either end?

The reason I ask is that I'm looking for an analog variable filter to
add in the feedback path of a delay... I'd like to be able to have a
single knob where the centre position is basically unaffected and I
can either cut bass or cut treble. I'm not too sure if I'd want

Maybe I can even go a simple route and do it all passively somehow?
(Maybe with a centre-tapped pot, or dual gang pot?)

-- 
Mike Beauchamp
http://mikebeauchamp.com
mobile: +64 21 0 AS I BIKE (2742453)
home: +64 4 801 8304
work: +64 4 915 4068
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