Creating a sound Output
 
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Part II Exercise Key
  • Lesson 27 
Seriously, I wouldn't expect you to count what you hear.  The beginning rate is producing 40 click per second.  One click as the signal moves from ground to voltage.  The next click as it moves from voltage back to ground. 
Click On, Click Off.  Click On, Click Off. 

Do look at this material.   How a Speaker Works.