Homebrew PCBs

On Monday 30 August 2004 07:29 pm, ron amundson wrote:

> One could also use optocouplers and a mylar disk...
> bit it gets spendy.

Not necessarily.  I have a couple of motors equipped with such encoders.  And 
you have two of them in any given mouse that's out there -- it shouldn't be 
too hard to adapt that technology to be used with a knob and a shaft,  though 
a good bit of weight behind the panel gives it a better feel.

This sort of thing was actually used,  in a z80-based system to control most 
all functions on the Moog Source -- you had what was basically a membrane 
panel,  where you selected what function you wanted to mess with,  you had a 
couple or three digits of LED display to tell you what the current value was,  
and you had one big knob to fiddle with it.

Not bad...