[sdiy] Mod Wheel Thoughts

[john mahoney]

> Ian's thought about the stable initial position makes me think I need to
> come up with some sort of
> stable mechanical detente at the initial postion. I think I will combine
> this with electronics that have a sort
> of threshold. The circuit only responds after a minimum movement.
> Making this unnoticeable will challenging.

You could try an "optical detent" -- an area of 50% gray in the center
section of the gradient. Here's an exaggerated (and poor quality!) version
of what I mean:
http://www.bitshifted.com/images/gradient.gif

I am assuming that 50% gray yields a 50% CV output, though I don't know how
linear the CDS response will be.


A sliding shutter, cut at an angle, seems like a great way to avoid the need
for a high quality gradient. Analogous to my optical gradient example, you
could put a flat area in the middle of the shutter.
--
john