I got a lot of help in understanding this circuit in a previous post.
I just don't understand the choice of R3 or why it is even there exactly.
EDIT: I just read my question and realized I give no context at all. This is supposed to be a levelshifter from 3.3V to 5V the Output requires near 5V for High and near 0V for Low.
Why is R3 1koHm? Is it to limit the current to the output although I though a digital input has negligible current draw? Or is it just cause I need something to create a voltage drop and i don't care about the current anymore? Or is 5mA just a standard for digital signals?
Thank you guys alot