[sdiy] Yamaha analog and step sequencer

[Andre Majorel]

On 2008-11-12 13:33 +0100, Terje Winther wrote:

> So, if I have an old Yamaha analog synth, like the CS-5, which have Hz/ 
> oct keyboard CV, and positive Volt-triggers, which old step sequencer  
> can be used with this synth?
> I can´t find any old sequencer that can be used right off, without being 
> modded some - but then of course the sequencer will not work with other 
> synths as intended.

A sequencer where the output voltage is linearly related to the
pot angle would be usable. Not ideal, but usable. Especially if
you reduced the range to, for example, 1~2 V instead of 0~5 V or
whatever it is by default. You could do that with a voltage
divider and a non-inverting mixer.

An exponential amplifier would be a more general solution.

  http://rubidium.dyndns.org/~magnus/synths/schematics/oct2hz.pdf
  http://www.sequencer.de/synthesizer/viewtopic.php?t=18099
  http://www.sdiy.de/de/projects/oct-hz-converter.html

-- 
André Majorel <URL:http://www.teaser.fr/~amajorel/>