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Author Topic: Why are Darlington transistors used to drive the 28BYJ-48  (Read 517 times)

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Offline Sudo_apt-get_install_yumTopic starter

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Why are Darlington transistors used to drive the 28BYJ-48
« on: July 12, 2019, 09:43:55 am »
Hi everyone!

So I’ve been playing around with some cheap Chinese stepper motors (28BYJ-48) and I have no idea why they use a ULN2003 "stepper motor driver". It’s just a Darlington array.
Why not used mosfets?

Could someone shine a light on this?
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Offline capt bullshot

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Re: Why are Darlington transistors used to drive the 28BYJ-48
« Reply #1 on: July 12, 2019, 10:25:14 am »
Because the ULN2003 is old, dead cheap and has free wheeling diodes built-in.
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Offline Ysjoelfir

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Re: Why are Darlington transistors used to drive the 28BYJ-48
« Reply #2 on: July 12, 2019, 10:27:24 am »
Quote from: capt bullshot on July 12, 2019, 10:25:14 am
Because the ULN2003 is old, dead cheap and has free wheeling diodes built-in.

In addition to that, for those steppers even the faked, even more cheaper ULNxxxx knockoffs are absolutely fine.
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Greetings, Kai \ Ysjoelfir
 
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