I would like to thank everyone who helped me about this, now I =
understand how and why?

best regards,

Omer YALHI


> I would like to give an open drain output from a circuit (RA4 not =
available)
> The circuit works with 3V or 3.6V which transistor do I choose and =
what
> resistors should I use (or how do I calculate which resistor to use
> given the 3V input voltage)  I probably can use BD138 but I don't know
> how to connect it to my circuit and the resistor values.

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