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???
05/07/08 23:15
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#154555 - Level translator
Responding to: ???'s previous message
For the LED's anode you should use some kind of level translator/driver (google). And I should use a NPN darlington with some seris 10K base resistor for cathode (may be ULN2003!!).

ULN2003 is a seven NPN darlington array. It can not source any current to LED´s anodes.

List of 6 messages in thread
TopicAuthorDate
At89c52 port pin source            01/01/70 00:00      
   ?            01/01/70 00:00      
      ULN is negative logic.            01/01/70 00:00      
         Level translator            01/01/70 00:00      
   How much current?            01/01/70 00:00      
      Power cosumption            01/01/70 00:00      

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