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???
06/13/08 17:37
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 		 #155870 - 470uF
Responding to: ???'s previous message
Kai Busuttil said:
I have included a 470uF electrolytic capacitor near the supply (supply to ground) to short ant high frequencies.


470uF is nowhere "fast" enough for high-ish speed digital stuff. You really do need a 0.1uF cap from the power pin(s) on each chip to the ground plane.

I realize that many university classes don't teach these sorts of "real-world" details, and that's a shame.

-a



List of 45 messages in thread
TopicAuthorDate
I'm getting insane! pls help!            01/01/70 00:00      
   I do not know much about Arghmel, but            01/01/70 00:00      
      >Arghmel<, Erik, are you crazy?            01/01/70 00:00      
         fair warning to all            01/01/70 00:00      
   Thanks for the props but....            01/01/70 00:00      
      have you tried changing the chip            01/01/70 00:00      
   Yep            01/01/70 00:00      
      the Arghmel users should wake up soon            01/01/70 00:00      
         The Problem Often Is The ...            01/01/70 00:00      
            I'll try that            01/01/70 00:00      
               But....            01/01/70 00:00      
                  What breed of MAX232?            01/01/70 00:00      
                     so...            01/01/70 00:00      
                        Trainer Board            01/01/70 00:00      
                           um quite similar...            01/01/70 00:00      
                        Your schema looks fine            01/01/70 00:00      
                           a strange thing has happened            01/01/70 00:00      
                              470uF            01/01/70 00:00      
                                 Just wanted to state the same            01/01/70 00:00      
                              It would have to be a very good 470uF cap ...            01/01/70 00:00      
                                 Richard??            01/01/70 00:00      
                                    What negative effect would that be?            01/01/70 00:00      
                                       let's do that, you start            01/01/70 00:00      
                        DEAD wrong            01/01/70 00:00      
   Oh uh......            01/01/70 00:00      
      Wrong Xtal may be            01/01/70 00:00      
         0.1uF ok then            01/01/70 00:00      
            Are you sure?            01/01/70 00:00      
               I found a usable one            01/01/70 00:00      
                  Did you find the reason            01/01/70 00:00      
                     still searching for the reason            01/01/70 00:00      
            Model of a capacitor            01/01/70 00:00      
         18.432MHz for Std Baud Rates ...            01/01/70 00:00      
   Shorts,shorts,shorts,            01/01/70 00:00      
      Pictures?            01/01/70 00:00      
         why is that?            01/01/70 00:00      
            Just Curious            01/01/70 00:00      
               Hey uh Jon i had already removed all socketed ICs            01/01/70 00:00      
      Vss for logical chips SHOULD be ground            01/01/70 00:00      
         Stupid me, i meant Vcc not Vss            01/01/70 00:00      
         Let\'s call this a day            01/01/70 00:00      
            Good Luck!            01/01/70 00:00      
               Thank you all            01/01/70 00:00      
   Boot loader running?            01/01/70 00:00      
      I'll try it tonight            01/01/70 00:00      

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