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Andy Neil
05/21/07 01:23
Read: 431 times
Basingstoke
Uk


 		 #139569 - Sinking and sourcing
Responding to: Chinmay Nanda's previous message
Chinmay Nanda said:
I am not sure as to what you mean by "Use the micro pins to sink the 6N137 diode current

  • "sink" refers to current flowing into a pin;

  • "source" refers to current flowing out from a pin.

    Chinmay Nanda said:
    right now i am grounding the cathode

    So you need a current source to drive it; ie, you need the current to flow out from the pin, through the diode, to ground.

    You need to reverse the diode, so that the anode connects to Vcc and the current is switched to ground through the 8051's pin; ie, the 8051 pin "sinks" the current.

    Don't forget the limiting resistor, of course...

    • List of 37 messages in thread
    TopicAuthorDate
    need for isolating signals      Chinmay Nanda      05/18/07 14:36      
       avoiding the inverter      Kalpak Dabir      05/18/07 20:19      
          sinking the current      Chinmay Nanda      05/21/07 01:17      
             Sinking and sourcing      Andy Neil      05/21/07 01:23      
                the bulb blinked !!!      Chinmay Nanda      05/21/07 01:45      
                   Don't guess!      Andy Neil      05/21/07 02:25      
                      trnasfer char.      Chinmay Nanda      05/21/07 02:52      
                         Transfer characteristic      Andy Neil      05/21/07 03:01      
       More so      Russell Bull      05/19/07 01:05      
       I see two possibilities      Erik Malund      05/19/07 07:53      
          accuracy      Chinmay Nanda      05/21/07 01:05      
             0.01% approx 14 bits      Erik Malund      05/21/07 08:28      
             Hardly...      Kai Klaas      05/21/07 09:56      
       No need...      Kai Klaas      05/19/07 08:11      
          need to place inverter      Chinmay Nanda      05/21/07 01:13      
          my design      Chinmay Nanda      05/21/07 01:32      
             FRC?      Andy Neil      05/21/07 02:27      
                FRC?      Michael Karas      05/21/07 02:52      
                   or may be this......      Chinmay Nanda      05/21/07 02:57      
                      Not really      Andy Neil      05/21/07 03:04      
                      Flat Ribbon Cable connector      K.ganeshan      05/21/07 04:30      
                   FRC Connector!      Andy Neil      05/21/07 03:09      
                You don't know the Flat Ribbon Cable?      Kai Klaas      05/21/07 09:40      
                   Not by that name!      Andy Neil      05/21/07 09:54      
             FAQ: How to post pictures?      Andy Neil      05/21/07 02:29      
             you are grasping for straws      Erik Malund      05/23/07 06:15      
             sure, but to what use      Erik Malund      05/23/07 06:21      
             grounds etc      Andy Peters      05/24/07 02:43      
                not entirely correct      Erik Malund      05/24/07 06:32      
                   single plane      Andy Peters      06/04/07 18:27      
                      A very well qualified layout person can do 'magic'      Erik Malund      06/05/07 06:00      
                         but he can hardly outsmart the laws of physics      Kai Klaas      06/06/07 12:06      
                      Nevertheless, there IS a difference      Kai Klaas      06/06/07 12:02      
                         the difference      Andy Peters      06/06/07 13:00      
                            Yes, yes, yes, but...      Kai Klaas      06/06/07 22:30      
       Aside: Other Isolation Technologies      Andy Neil      05/23/07 02:37      
       no response      Henk Landwerd      06/04/07 13:29      

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