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Old 22 May 2014, 00:07   #413
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Join Date: Dec 2012
Location: Sweden
Posts: 125
If it is an active low on the step, why not use a BC557 (PNP) BJT instead?

(EDIT: And to be on the SAFE side, wire that buzzer to +5V, it makes little difference to sound volume, but it makes a huge difference if the transistor breaks down and you send the buzzer voltage directly to the step pin.)

Last edited by Johan1973; 22 May 2014 at 00:48.
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