>  I need simple converting circuit to protect PIC input.
>  Input levels 0 - 5v - 12v, open or not collectors.
>  Could anybody comment attached .gif, please.
>  Isn't it an overkill?

It looks like it could hurt your PIC by raising the +5 Vdd.

What's wrong with a diode pointing from the PIC to your input and a pullup
resistor on the PIC pin? And if you need protection from negative
voltages, an input series resistor and also a diode from ground to the
PIC pin?

Cheers,

Bob

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.