I would like to give an open drain output from a circuit (RA4 not =
available). =20
The circuit works with 3V or 3.6V which transistor do I choose and what=20
resistors should I use (or how do I calculate which resistor to use =
given=20
the 3V input voltage)  I probably can use BD138 but I don't know how to=20
connect it to my circuit and the resistor values.

any help is appricated.

oyalhi@teksan.com.tr

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