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Old 23 May 2014, 00:47   #425
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Join Date: Sep 2006
Location: Thunder Bay, Canada
Posts: 3,257
Originally Posted by robinsonb5 View Post

A couple of criticisms, though:
According to the datasheet on the digi-key page, the buzzer you've specified there is only rated for 3v. No problem if it's only getting momentary pulses, but it's not: STEP is active low, so unless I'm misunderstanding something here there's 5v across that buzzer for 99.9% of the time.

The buzzer's own resistance is also very low (only 20 Ohms according to the datasheet) so again, bearing in mind STEP is active-low, and thus there's voltage across the buzzer while it's idle, the power draw is quite high. (I hope the DC resistance of the buzzer is somewhat higher than 20 Ohms, but the datasheet only specifies "resistance" - the datasheet of the other buzzer you used specified impedance and DC resistance separately.)
The 3v was the rating, the voltage range was 2 - 5v so it should be good
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