Hi all,
I hope I am not asking an obvious question, but I can't seems to find the answer to why 10K resistor is chosen in the manual when connecting an output pin to a transistor.
I understand the resistor is there for chip protection purpose (correct me if I am wrong there too,) so if we assume Vdd is 5V and a typical output pin of a picaxe chip is ~20mA, Shouldn't we use resistor that is ~250ohm instead?
I hope I am not asking an obvious question, but I can't seems to find the answer to why 10K resistor is chosen in the manual when connecting an output pin to a transistor.
I understand the resistor is there for chip protection purpose (correct me if I am wrong there too,) so if we assume Vdd is 5V and a typical output pin of a picaxe chip is ~20mA, Shouldn't we use resistor that is ~250ohm instead?