[sdiy] Mod Wheel Thoughts

[Ian Fritz]

Ray --

I've done a bit of work with optoelectronic sensors for my ww-type controllers.
http://home.earthlink.net/~ijfritz/st_close.htm  (Last Fig.)
http://home.earthlink.net/~ijfritz/st_cir2.htm
http://home.earthlink.net/~ijfritz/st_cir6.htm

 From my experience, I would say that you need to think more about how your 
sensor would be used in practice.  Do you want to use it for pitch 
bend?  Then you need to ensure that the zero-displacement position gives 
you an exact and stable zero-volt output.  You probably will not be happy 
with the results if you merely use an offset circuit with a trimmer to set 
the zero.

Regards,

   Ian


At 10:37 AM 3/13/2005, Ray Wilson wrote:
>Hi All
>
>I would like to seed a discussion about mod wheels using LED and CS cell.
>Check this out and tell me how this might work... or not.
>
>http://www.musicfromouterspace.com/analogsynth/ModulationWheel/ModulationWheel.html