Guess that would make me arrogant then.

> What exactly is a ULN2003?

> Are they
> so arrogant to think everyone else must know the part number because they
> are using it, or too dumb to realize there are far too many parts for
anyone
> to know more than a tiny fraction?


For your information, the ULN2003 is one of a family of very commonly used
(certainly in the UK) darlington driver ICs. The family is available in 7 or
8 ways per IC, and is quite useful for stepper motor projects especially.

TIP to original poster: You can parallel up the ULN2003 channels to get more
current, e.g. 2 channels gives approx 1A

4ohms seems a bit low for a 12V stepper motor - in a disk drive anyway.
Running from 5V, you would need about 1A per winding to hold this, so
pairing channels on the 2003 (or 2803 which is the 8 channel version)

Regards, Kevin

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