Hi Picsters Found an interesting circuit on the web the author says' and I quote "Never let any unused input pins floating, always connect it to ground or V+." It ok with me. but follow that way it's pretty a mess when editing the pcb. for example he use the 4066 quad bilateral switch but use only one switch the other 3 stay unconnected and of course not used. my question is should I follow this order? even in the manufacturer's datasheet it's not mentioned. what should I do? is it correct? Regards Tal Bejerano AMC - ISRAEL -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics