[sdiy] CV inputs with bipolar "amount" knobs

[Harry Bissell]

If its a CV input from a slow moving voltage (KBD, ENV etc) it would be fine
but if its audio rate modulation, you may find it difficult to get the null point.

It also depends on use. For noodling in the studio, a fidgety knob is fine. For
live performance, it needs to be rock solid (at zero) imho.

I really prefer the center-tapped pot with the center grounded. That works from
DC to any reasonable frequency, and the center detent is usually aligned
with the tap (the tap is mechanically wide...)

H^) harry

----- Original Message -----
From: David G. Dixon <dixon at interchange.ubc.ca>
To: 'Matthias Herrmann-DEU' <Matthias.Herrmann at jeppesen.com>, Synth-diy at dropmix.xs4all.nl
Sent: Tue, 27 Jul 2010 11:00:02 -0400 (EDT)
Subject: Re: [sdiy] CV inputs with bipolar "amount" knobs

> in my experience a potentiometer with center detent could cause another
> problem: you might not always have the same resistance value at the
> detented position. it may be different each time you set it back to zero.
> however, for a VCFs control voltage input it might not be crucial, and it
> may depend on the quality of the potentiometer - I tried alpha and alps
> with no luck.

Yes, I'd thought of that.  However, as you say, it's just a CV control for a
filter, so it's really not that critical.  I just listen for the centre
point anyway.

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-- 
Harry Bissell & Nora Abdullah 4eva