AW: Duophonic Keyboard

[Gene Zumchak]

Ulrich,

    My circuit did not involve the trigger generation for the second CV, but just the CV generation itself as
recently describe by Michael Irwin.  As I have already said,  I hope to have a keyboard writeup for those who
are curious about how a Moog style keyboard works, and how to modify it for the 2nd note.

Gene


Ullrich Peter wrote:

>         Hallo Gene!
>
>         >As you point out, the CV's are not independent and there is no second trigger.
>         >This could be added by differentiating the change in the second control voltage.
>         >In other words, this has its limitations, but it's practically free.
>         >My name is on the patent.  I think it was about '71.
>
>         Your name is on the patent? Interesting.
>         I built such a circuit in the 80s. I think it was called new pitch detector.
>         It was built as you said with a differentiator and rectifier and schmitt trigger or pulse shaper.
>         I don't have this circuit any longer so maybe you could give us a circuit!
>
>         Ciao
>         Peter
>
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