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???
06/09/06 13:55
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 		 #118096 - rise/fall times (hair-splitting)
Responding to: ???'s previous message
Erik Malund said:
The PC817 properly driven has a propdelay of 18us, change that to 20 for ease of calculating.

PC817, properly loaded has the mentioned rise and fall times (max). That's 100Ohm load. And only 2V VCE!!! (not 5). Of course, these imply also some drive. And it's together 36us per pulse, so your factor of 5 is actually 2.5 :-)

JW



List of 41 messages in thread
TopicAuthorDate
AT89S8252 MIDI Baud Rate            01/01/70 00:00      
   Have you ...            01/01/70 00:00      
      A 12 MHz xtal ...            01/01/70 00:00      
         why deprioritize what can not happen?            01/01/70 00:00      
         AT89S8252 MIDI Baud Rate            01/01/70 00:00      
            AT89S8252 MIDI Baud Rate            01/01/70 00:00      
            My settings from the 80's            01/01/70 00:00      
                I don't see Initialization Problem            01/01/70 00:00      
                  First results            01/01/70 00:00      
                     This could have problems            01/01/70 00:00      
                        strange behaviour            01/01/70 00:00      
                           indentions            01/01/70 00:00      
                           post the .lst or hex            01/01/70 00:00      
                              hex code and problem location            01/01/70 00:00      
                                 6N138            01/01/70 00:00      
                                 PC817            01/01/70 00:00      
                                    Debugging            01/01/70 00:00      
                                 had a look            01/01/70 00:00      
                                    rise/fall times (hair-splitting)            01/01/70 00:00      
                                       you cn't do that            01/01/70 00:00      
                                          PROBLEM SOLVED            01/01/70 00:00      
                                             Great Stuff - Glad it's working            01/01/70 00:00      
                                                next            01/01/70 00:00      
                                                Dark side of 
 tags      
      01/01/70 00:00      
                                                   What you are totally missing is t            01/01/70 00:00      
                                                   Interesting ..            01/01/70 00:00      
                                          if you look at me, you will know :)            01/01/70 00:00      
                  My settings from the 80's            01/01/70 00:00      
      Not a "standard" baud rate            01/01/70 00:00      
         Loop back would work because ...            01/01/70 00:00      
   Because it happens later ....            01/01/70 00:00      
   what is your hardware?            01/01/70 00:00      
      hardware            01/01/70 00:00      
         what optocoupler and what are the parts            01/01/70 00:00      
            emmeiG odoC            01/01/70 00:00      
               I was just about to make a suggestion            01/01/70 00:00      
               A suggestion            01/01/70 00:00      
                  Close            01/01/70 00:00      
                     No, by no means are you supposed to beg            01/01/70 00:00      
         Gimme Code            01/01/70 00:00      
         A SCOPE ???????            01/01/70 00:00      

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