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???
08/07/06 02:35
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 		 #121766 - In such a case...
Responding to: ???'s previous message
Leonardo said:
Yes, you're right. but... =) The majority of piezo buzzers I've seen need about 30-35mA to sound clear (at the specified frequency). They may work driven directly from the MCU, but may not sound as expected (if that's important)...

Yes, in such a case an additional driver would indeed be required.
But what wonders me is this current limiting resistor Eugene seems to need.

Kai

List of 40 messages in thread
TopicAuthorDate
Does logic "low" represent 0V?            01/01/70 00:00      
   The diagram does not work            01/01/70 00:00      
      What current are we talking about?            01/01/70 00:00      
      More details needed!            01/01/70 00:00      
   Using a transistor            01/01/70 00:00      
      Yes, but...            01/01/70 00:00      
         bear in mind            01/01/70 00:00      
            Of course, but...            01/01/70 00:00      
         forgot to mention: cookbook was for a piezo buzzer            01/01/70 00:00      
            In such a case...            01/01/70 00:00      
      Low hissing sound            01/01/70 00:00      
         Try            01/01/70 00:00      
            Circuit details and summary of my problem            01/01/70 00:00      
               either a mistype or connecting the buzzer the wron            01/01/70 00:00      
                  Update            01/01/70 00:00      
                     Please do as I have asked: connect the buzzer            01/01/70 00:00      
               What you tell is confusing...            01/01/70 00:00      
                  As mentioned by Kai Klaas            01/01/70 00:00      
                     Do not 'believe' MEASURE and be sure            01/01/70 00:00      
               Solving buzzer problem            01/01/70 00:00      
   Barbecue?            01/01/70 00:00      
   Type of buzzer            01/01/70 00:00      
      who knows how much power, how big spikes            01/01/70 00:00      
      Again...            01/01/70 00:00      
         Yeah            01/01/70 00:00      
            Try this!            01/01/70 00:00      
               just guessing            01/01/70 00:00      
                  guessing the current is below 5A...            01/01/70 00:00      
                     then what if it is 1uA            01/01/70 00:00      
                        Sorry.            01/01/70 00:00      
                     We just do not want to guess!!            01/01/70 00:00      
                        Sorry.            01/01/70 00:00      
                           No need to appologize, dear Leonardo...            01/01/70 00:00      
                           not a metter of apology            01/01/70 00:00      
               Buzzer Problem Solved            01/01/70 00:00      
                  Nice to know            01/01/70 00:00      
   No longer interested, Eugene??            01/01/70 00:00      
      of course not            01/01/70 00:00      

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