[sdiy] push button CV wanted

[raywilson at comcast.net]

I suggest an 8 bit up down counter made from 2 CD40193s and some stepping logic (CD40106). And then hang a R/2R ladder off of the outputs with a high impedance follower. Simple cheap and actually pretty darn accurate.

Ray


> From: Roy J. Tellason [mailto:rtellason at blazenet.net]
> > I have an application in mind for which I'd like the user 
> > interface to be a 
> > couple of push buttons,  one that would raise and the other 
> > one of which 
> > would lower a control voltage.  
> 
> Sounds like a job for one of those programmable
> pots.  Put one in as the bottom half of a voltage
> divider, connect buttons to the increment and decrement
> inputs, and there you are.
>