Mario Mendes Jr. wrote:

> Anyone here has a link or details about how this is implemented?  I would
> be specially helpfull if you had a diagram WITH the resitor values in it
> =) but I can try to come up with those values on my own if you have a
> schematic (or a good explanation of how everthing is connected).

Do a search for an R2R Ladder -- an inexpensive way of crudely 
generating analog voltages from a bunch of port pins.

Here's a Microchip App Note that shows a DAC. The same ladder network 
with your switches instead of port pins should do the trick.

<http://ww1.microchip.com/downloads/en/AppNotes/00655a.pdf>

Tim
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