Archive of the former Yahoo!Groups mailing list: MOTM
Subject: Re: [motm] new module request - drift generator
From: jwbarlow@...
Date: 2002-01-17
One thing I like to do (which is kind of related) is to patch noise (or LF random) to a VC lag processor to the SH to the CV input of a VCO. With careful adjustment of the VC and other controls one can get the pitch to roam the whole 10v (ten octave) range, but moving by very small steps thereby taking a long time to get there -- actually, I tend to use patches like this more often for things other than VCOs.
I guess that patch is pretty obvious, and has nothing to do with oscillator drift; something which seems less novel when one has to tweak the tuning of the VCOs of a 2600 every three hours of use (and those sliders make it even more fun).
JB
In a message dated 1/16/02 1:34:24 PM Pacific Standard Time, celesteh@... writes:
This module will have knobs controlling the speed of the drifting and
whether it has an upward or downward tendency. What happens is that the
module outputs some DC voltage. Periodically, depending on the speed
setting, it will look at some randomness and add or subtract some number
of milivolts from it's output depending on what the random number was. It
will then ramp it's output up or down to the new value.