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???
12/25/08 13:17
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 		 #161127 - common cathode
Responding to: ???'s previous message
you will need a "high side driver" (8 transistors or an IC (look at Allegro))

Erik

List of 40 messages in thread
TopicAuthorDate
Help with 4 digit LED 7 segment display            01/01/70 00:00      
   common cathode            01/01/70 00:00      
   Maybe it is a standard display            01/01/70 00:00      
      It's standard, but I can't find a spec sheet            01/01/70 00:00      
         an old-time part, perhaps?            01/01/70 00:00      
            The 8650 is a standard alarm clock IC            01/01/70 00:00      
               add up the forward voltages, adjust the resistors ...            01/01/70 00:00      
                  Diagram            01/01/70 00:00      
                     It's all up to you ...            01/01/70 00:00      
                        Too soon to start worrying about voltage            01/01/70 00:00      
                           Be careful ... you only have one of these ... right?            01/01/70 00:00      
                     beware            01/01/70 00:00      
                        Interesting concept            01/01/70 00:00      
                        Don't think so            01/01/70 00:00      
                           make a FULL schematic            01/01/70 00:00      
                              Of course            01/01/70 00:00      
                           Careful, now!            01/01/70 00:00      
                     Diagram mis-labeled, sorry            01/01/70 00:00      
   Please consider that....            01/01/70 00:00      
      Lookup table            01/01/70 00:00      
         'Ohm" it out            01/01/70 00:00      
            I don't see how            01/01/70 00:00      
               then forget transistors            01/01/70 00:00      
         2-Anode 12-Cathode Drive Diagram            01/01/70 00:00      
            Thanks            01/01/70 00:00      
   It works like this....            01/01/70 00:00      
      Vbe, not Vce            01/01/70 00:00      
         that was probably I who did that ... and you're right            01/01/70 00:00      
            Well...            01/01/70 00:00      
               take a close look            01/01/70 00:00      
               I doubt it            01/01/70 00:00      
                  Possibly a radio section too            01/01/70 00:00      
                  Crystals            01/01/70 00:00      
                     That C### is a capacitor number, I think            01/01/70 00:00      
      How about this?            01/01/70 00:00      
         use PNP at the high side            01/01/70 00:00      
         ...And get rid of the extra resistor in the...            01/01/70 00:00      
            Thanks. Time to test and draw            01/01/70 00:00      
               multimeter solution            01/01/70 00:00      
                  Similar to what I did            01/01/70 00:00      

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