[sdiy] Q: oscillator bank

Scott Gravenhorst music.maker at gte.net
Mon Nov 15 15:07:12 CET 2004


A partial example of this is the PAiA FatMan synth.  It uses 2 VCOs both
driven by the same linear control voltage.  All that is needed is to create
an expo converter that makes a voltage from the normal current output to
drive the linear CV input to the VCOs.  Full details at http://www.paia.com

Grant Richter <grichter at asapnet.net> wrote:
>This is exactly how the EML-101 was done. There are two uA726s, one for the
>VCOs and on for the filter. But everything is linear voltage responding.
>
>It works, a bit fussy though.
>
>>> My thoughts on this:
>>> - sum the various control voltages: keyboard key, plus modulation, plus
>>> pitch-bend
>>> - apply to the exponential converter
>>> - use the converted Hz/V value to drive several oscillators
>>> - each oscillator has octave switching via a resistive divider
>>> - each oscillator (but one) has scaling to allow relative tuning +/-
>>> some interval
>>> 
>

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