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What type of stepper motor, anyway? Bipolar would make it rather tricky to use the ULN2003A because you need to both source and sink current. I tried to whip up a circuit to drive a bipolar stepper with ULN (2803 in my case) some time ago but it was a very inefficient way of doing it and would...
Augmenting an ULN darlington array chip kinda defeats the purpose of using it.
At 60 cents per IC it's supposed to be a quick and cheap way of powering something that needs more sink than your logic (or MCU) can provide. If you find yourself needing to add more switches, you're much better off...
Given that on your schematic the stepper only has 4 wires, I have to assume it's a bipolar one. These are a pain to drive with ULN2003 (or ULN2803 or other Darlington arrays) because the chips are designed to sink current and you need to be able to send both high and low voltages to each of the...
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