David VanHorn wrote: >>I am imaging two diodes in parallel, and one of them inverted, like a >>transmision gate, and where is signal, then that way is the one >>transmitting...ummm...i don't know if someone understand what i am >>triying to say, but i am getting things clear... >> >> > >The two diode trick is cute. > >Assume two units, "left" and "right", with the diodes in the middle: > >Left----------+-->|--+------------Right > | | > +--|<--+ > > >When LEFT sends +5V to RIGHT, the current flows left to right, and the top diode that points left to right conducts, and you get +0.3V on the left side, relative to the right. >When RIGHT sends, you get +0.3V on the right side, relative to the left. > > Thanks !! That's what i was thinking while i was writing :-D You just post response before i ask x-D Cheers ! -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.