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???
11/27/07 18:28
Modified:
  11/27/07 18:28
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 		 #147461 - that\'s the problem!
Responding to: ???'s previous message
A "solderless breadboard" should never be used for anything operating at a frequency much above 60 Hz! Even then, they're very unreliable.

The power distribution is totally inadequate for anything much above DC, the inter-contact capacitance causes signals to couple from one to another, and the contacts are, at best, unreliable.

What's more, the circuit changes by itself as ambient temperature and pressure change.

RE


List of 60 messages in thread
TopicAuthorDate
PC COM Ports Damaging !!!            01/01/70 00:00      
   Earth loops?            01/01/70 00:00      
      Why Now and this circuit ?            01/01/70 00:00      
   Damage?            01/01/70 00:00      
      I am Sure ...            01/01/70 00:00      
   Common mode            01/01/70 00:00      
      You haven't mentioned            01/01/70 00:00      
   do you have the shell of DB9 grounded?            01/01/70 00:00      
   Serial port damage            01/01/70 00:00      
      for serial port damage            01/01/70 00:00      
         No            01/01/70 00:00      
      No, that can't be right!            01/01/70 00:00      
         re:3.3V            01/01/70 00:00      
            are you sure about that, Andy?            01/01/70 00:00      
   Are You SURE?            01/01/70 00:00      
      I'm sure Dear ...            01/01/70 00:00      
         not to be argumentative ... but ...            01/01/70 00:00      
   check it            01/01/70 00:00      
      Checks            01/01/70 00:00      
         We haven't seen how the DB-9 is wired            01/01/70 00:00      
            It\'s probably not a DB-9!            01/01/70 00:00      
               sure, but            01/01/70 00:00      
               Sloppy terminology            01/01/70 00:00      
   My Burned out ports            01/01/70 00:00      
      What?            01/01/70 00:00      
         What I mean is            01/01/70 00:00      
   a common misunderstanding is            01/01/70 00:00      
      So problem is in "modern" PCs?!            01/01/70 00:00      
      So problem is in "modern" PCs?!            01/01/70 00:00      
         maybe i'm wrong            01/01/70 00:00      
   try with opto coupler and +9 volt supply            01/01/70 00:00      
      Back when folks cared whether things work ...            01/01/70 00:00      
      Assuming He does not have one            01/01/70 00:00      
         There is a way to be sure.            01/01/70 00:00      
            Standard            01/01/70 00:00      
               Power Supply ...            01/01/70 00:00      
                  Dwhatever9 shell connection to GND...            01/01/70 00:00      
                     about that shell-to-shell connection            01/01/70 00:00      
                        generally...            01/01/70 00:00      
                  Truth emerges            01/01/70 00:00      
                     developed?            01/01/70 00:00      
                  that\'s the problem!            01/01/70 00:00      
         HUH?            01/01/70 00:00      
      why??            01/01/70 00:00      
         Broken COM port suggestions            01/01/70 00:00      
            he is not wrong - if            01/01/70 00:00      
               ...he is not wrong... only said watch it            01/01/70 00:00      
                  BULL!!!            01/01/70 00:00      
                     Bull?            01/01/70 00:00      
                        yes, genuine male cow manure            01/01/70 00:00      
                           Eric, you are a sad man            01/01/70 00:00      
                           Amateurs and pros            01/01/70 00:00      
                              of course I do            01/01/70 00:00      
                     Well, it has to do...            01/01/70 00:00      
                        Kai, I now you know this stuff ... but            01/01/70 00:00      
                           Different CMOS design?            01/01/70 00:00      
   that's right, when you can not argue tha facts ...            01/01/70 00:00      
      My Dear Friends ...            01/01/70 00:00      
         look in the datasheet            01/01/70 00:00      
            Y E S . . .            01/01/70 00:00      

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