[sdiy] Keyboard Circuit - Seperate Keyboard and Gate buses?

[Chris Manders]

Thank you to you both for your input.

I concur with your points Harry.
It may be possible to emulate this with circuitry.

For anyone else interested, or following the thread,
the following page was very useful for me:

http://www.musicfromouterspace.com/analogsynth/keybrdcontroller.html

Chris

--- Harry Bissell Jr <harrybissell at prodigy.net> wrote:

> The unobvious is that the keyboard bus closes first
> and opens
>   last...
>   
>   so the voltage is applied to the sample/hold input
> before the gate...
>   and the gate goes away before the voltage is
> removed
>   
>   H^) harry
> 
> Chris Manders <wight446 at yahoo.com> wrote:  Hi folks
> 
> I am planning on building a simple keyboard circuit
> for my Synth.
> 
> Looking at some synth schematics, I notice that a
> large amount of them make use of two seperate bus
> bars
> - One for the CV (using a resistor ladder) and one
> for
> the gate. Indeed the (later?) ARP Odyssey used three
> -
> One further to generate an additional trigger pulse.
> 
> For the ones that use two, why should they choose
> this? Surely (and I what I have in mind) is that if
> any voltage is present on the CV input line as a key
> touches the resistor ladder, then that would be
> sufficient to generate the 'gate'? Surely just one
> bus
> would suffice?
> 
> I feel I am missing something obvious (story of my
> life, really).   :-)
> 
> Chris
> 
> 
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