defcon31 said:
What are you trying to do, and why do you have the 150mA requirement?.
the reason that i'm searching for this is that our customers often block the motor with their hands (without knowing that it causes extremely damage to the motor and the chip that has to feed to motor). we solved it with a fuse, but then they complain that they always have to open the machine to replace the fuse. so a current limiting circuit (or chip) of 150mA should protect the motor and the udn2981 chip that has to source to motor with 24V.
as some people told, with the lm317 it cannot be guaranteed that the motor can start or goes slower: this is not a problem... the only thing i want to protect everything.
so tomorrow i'm gonna study about the lm317-chip what i can do with it!
thanks in advance and if someone has better ideas (or remarks) for me as an electronics-newbee, always welcome!!!!