[sdiy] Looking for keyboard circuits

[Florian Anwander]

Hi David

there is
http://fa.utfs.org/diy/elektor-matrix-keyboard.jpg
from elektor (it is only a start and its similar to Rays kbd)

There was a thread on this theme in january 2009: "trying to understand 
appregiators in  late 70's synths" which discusses several aspects of 
matrix based keyboards.

Florian

G. Dixon schrieb:
> I'm in the market for a keyboard circuit,