How does uln2803 work??

[shobhit_goel10]

hi I am making a project using stepper motors and uln 2803.. Can someone please explain me what is uln2803, why is it required and what does it do and how??
Thanks so much..

 

[MikeMl]

How about learning to use Google!

 

[Sceadwian]

This is what PDF's are for =)
ULN2803 Datasheet pdf - OCTAL PERIPHERAL DRIVER ARRAYS - ON Semiconductor
It's all in there.

For simplicities sake, it takes a low input current and provides a much higher output current, micro controllers and most digital logic can't drive higher current devices.