View Single Post
Old 22 May 2014, 00:07   #413
Registered User
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.
Johan1973 is offline  
Page generated in 0.04992 seconds with 9 queries