Keyboard circuit (was Stretch tuning a resistor string)

[gerry]

Hi Everyone,
I'm currently working on a Moog taurus 1 project and I wanted to
set it up for v/oct and this info is looking like I need more changes
than an externeal resistor string, Is there a v/oct to v/hz circuit that
I can use to solve my problem?

Thanks.
Gerry Dahl


----- Original Message -----
From: Haible Juergen <Juergen.Haible at nbgm.siemens.de>
To: Don Tillman <don at till.com>
Cc: <synth-diy at mailhost.bpa.nl>
Sent: Wednesday, January 19, 2000 7:59 AM
Subject: RE: Keyboard circuit (was Stretch tuning a resistor string)


> >The only synth I know of that feeds the keyboard resistor string
> with
> >a regulated voltage is the Moog Taurus I.  And that uses double
> throw
> >keyboard switches.
>
> And as it's V/Hz, I assume these are not equal value resistors either.
> (The gif in front of me is too fuzzy to decide.)
>
> As for V/Hz resistor strings, there is this brilliant Korg solution, which
> works
> with a voltage source:
> Connect the S&H to the *end* of the resistor string, and use the key
> contacts
> to *feed* the voltage source to various positions of the resistor string.
> (Hmm, yes,
> it's not exactly a resistor string, but every second series resistor has a
> shunt
> resistor to GND, so it's more of a Ladder than s String. But that's just a
> clever
> means to avoid a lot of different resistor values. They get the
exponential
> response
> with just 3 different resistor values.)
>
> JH.
>