ULN2003 high-voltage, high-current Darlington array containing seven open collector Darlington pairs with common emitters. 16-pin DIP.
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useful little chip 
Reviewer:
A viewer
from south lake tahoe, ca
a few of these would be great for building your own massive 7 seg displays. big uber bright wall clock maybe? lol, also great for small steppers. drove 4 windings @ 12v 400ma each without flinching.
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