[sdiy] Commercial 1v/octave keyboards?

[WeAreAs1 at aol.com]

In a message dated 2/7/06 1:27:28 PM, wight446 at yahoo.com writes:


> I was hoping at some future stage to build my own 1V/Octave Keyboard, using 
> a cheap Casio or Yamaha full size one, ripping it apart and then soldering 
> 100 Ohms resistors between each key contact.
> 

It probably won't work very well with any keyboard that has conductive rubber 
type key contacts, as you find on all Casios and other cheap portable 
keyboards.   The contacts themselves have a certain amount of resistance, which not 
only varies from key to key, but can even vary depending on how hard you press 
down on the key.   This would wreak havoc with the tuning of your nice matched 
100 Ohm resistor string.   I think you pretty much need to use a keyboard 
that has clean metal contacts and offer near zero resistance if you're going with 
a resistor string.

Has anyone around here been successful making a reliable resistor ladder 
keyboard with a rubber contact system?
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