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???
09/07/04 03:03
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 		 #77002 - RE: 4k7 does not present a strong pull-u
Responding to: ???'s previous message
thank you very much for the detailed response.

I compared the source impedance of 'key + pull-up' combination with the source impedance of standard 74HCMOS push-pull output

now, I got that.


All this debouncing stuff is also needed, if you want to speed up response time of a keyboard:

I quite agree.

thank you very much indeed

List of 37 messages in thread
TopicAuthorDate
debouncing for matrix keypad ?            01/01/70 00:00      
   RE: debouncing for matrix keypad ?            01/01/70 00:00      
   correction            01/01/70 00:00      
   RE: debouncing for matrix keypad ?            01/01/70 00:00      
      RE: debouncing for matrix keypad ?            01/01/70 00:00      
         RE: debouncing for matrix keypad ?            01/01/70 00:00      
            RE: debouncing for matrix keypad ?            01/01/70 00:00      
         RE: debouncing for matrix keypad ?            01/01/70 00:00      
            RE: debouncing for matrix keypad ?            01/01/70 00:00      
               RE: debouncing for matrix keypad ?            01/01/70 00:00      
            RE: debouncing for matrix keypad ?            01/01/70 00:00      
               RE: debouncing for matrix keypad ?            01/01/70 00:00      
                  RE: debouncing for matrix keypad ?            01/01/70 00:00      
                     RE: debouncing for matrix keypad ?            01/01/70 00:00      
                        RE: debouncing for matrix keypad ?            01/01/70 00:00      
                           RE: debouncing for matrix keypad ?            01/01/70 00:00      
                              almost            01/01/70 00:00      
                                 RE: almost            01/01/70 00:00      
                                    RE: almost            01/01/70 00:00      
                                       RE: almost            01/01/70 00:00      
         RE: debouncing for matrix keypad ?            01/01/70 00:00      
            RE: debouncing for matrix keypad ?            01/01/70 00:00      
               RE: debouncing for matrix keypad ?            01/01/70 00:00      
                  RE: debouncing for matrix keypad ?            01/01/70 00:00      
                     RE: debouncing for matrix keypad ?            01/01/70 00:00      
                        RE: debouncing for matrix keypad ?            01/01/70 00:00      
            RE: debouncing for matrix keypad ?            01/01/70 00:00      
   my example code            01/01/70 00:00      
      RE: my example code            01/01/70 00:00      
   RE: debouncing for matrix keypad ?            01/01/70 00:00      
      RE: debouncing for matrix keypad ?            01/01/70 00:00      
   RE: debouncing for matrix keypad ?            01/01/70 00:00      
      RE: debouncing for matrix keypad ?            01/01/70 00:00      
   4k7 does not present a strong pull-up!            01/01/70 00:00      
      RE: 4k7 does not present a strong pull-u            01/01/70 00:00      
         RE: 4k7 does not present a strong pull-u            01/01/70 00:00      
            RE: 4k7 does not present a strong pull-u            01/01/70 00:00      

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