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???
09/19/05 10:32
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 		 #101217 - Why?
Responding to: ???'s previous message
Even if the LM339 is powered by 12V, if the output of the LM339 is to a 5V system then the pullup resistor should have one end at 5V and not 12V. If you still have a doubt, post your schematic.

List of 46 messages in thread
TopicAuthorDate
AT89c2051 port pin remains latched            01/01/70 00:00      
   1-to-0 transition current            01/01/70 00:00      
   OC comparator            01/01/70 00:00      
      a diode in series will do...            01/01/70 00:00      
      LM336-5            01/01/70 00:00      
         Price!! and speed?            01/01/70 00:00      
            Hmmmmmm...............            01/01/70 00:00      
               write PID sotfware for mcs51 micro.            01/01/70 00:00      
                  Start it as a new thread            01/01/70 00:00      
      Using LM339 only            01/01/70 00:00      
         LM339!            01/01/70 00:00      
            Pull up to 339            01/01/70 00:00      
               Why?            01/01/70 00:00      
               here are the two schemes            01/01/70 00:00      
                  not 12V, but 5.7            01/01/70 00:00      
                     and            01/01/70 00:00      
                        ???            01/01/70 00:00      
                           Question            01/01/70 00:00      
                              LM339            01/01/70 00:00      
                              open Collector            01/01/70 00:00      
                                 OOPS.            01/01/70 00:00      
                  12V swing            01/01/70 00:00      
                     there were three pictures...........            01/01/70 00:00      
                        yep...            01/01/70 00:00      
   Use P1.0 or P1.1            01/01/70 00:00      
      P1.0 and p1.1 are used            01/01/70 00:00      
   yep!! that is solved            01/01/70 00:00      
      Nothing is solved...            01/01/70 00:00      
         why so complicated?            01/01/70 00:00      
            Vil for 89c2051            01/01/70 00:00      
               then use a Schottkey            01/01/70 00:00      
                  LM339            01/01/70 00:00      
                     It probably will in the lab, the            01/01/70 00:00      
                        noise immunity?            01/01/70 00:00      
                           it most certainly does            01/01/70 00:00      
            Low-voltage noise margin            01/01/70 00:00      
               Real Programmers don't use Pascal            01/01/70 00:00      
                  It's so easy to state your opinion and t            01/01/70 00:00      
                     no more words            01/01/70 00:00      
                  It's amateurish to reduce noise margins            01/01/70 00:00      
                     hair-picking            01/01/70 00:00      
                        Fan-out specification            01/01/70 00:00      
                           Circuits that work on.....            01/01/70 00:00      
                     Rise times at 3MHz            01/01/70 00:00      
                        a small correction            01/01/70 00:00      
   I second the motion            01/01/70 00:00      

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