Quote Originally Posted by pmafer View Post
Hello,

Thanks all for your comments.

i recheck hardware and all seems ok.

i'm going crazy with this one. defective ic? its uncommon...


Paul
How OLD is your breadboard ? Those breadboards into which you just push the wires in corrode BIG TIME in just a couple of years especially if kept in a basement or garage. So verify your connections with an ohm meter, if it is not relatively new.