On Mar 26, 2008, at 6:06 AM, Anders Wallin wrote:

>> <snip>
> Some jogwheels use differential signals, which means instead of  
> just the
> A and B signals you get A+, A-, B+, and B-. If you have I/O to  
> spare you
> could wire all four of these to EMC. If you want to condense these  
> four
> into just two A and B signals you can do that with an IC. I did that
> with a DS3486.
>
LM339's are really fast and therefore not too noise immume.
RS-485/RS422 chips like the one Anders used are a good solution.
They might even work if used single ended.

for another chips see:

http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2273

HTH

Dave

>
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