22 Comments


  1. could you please help me how do you identify if both legs the anode and the cathode have been cut the same lenght

    Reply
    • Elecrom

      read the post again :)

      Reply
  2. Aditi

    very much thanks for info.

    Reply
  3. Darnko

    I haven’t been working around diodes for a spell, and with me getting worse the older I get, I can forget such a simple way of telling a cathode from an anode. I can’t believe how far down it is on a Google site and even here it method #4. Well that was it, at least they had it. I just knew there was something besides using resistors and so on.

    Reply

  4. best method for highlighting the quality of education tips thanks

    Reply
  5. Abhisek kora

    thanks for this information…….

    Reply
  6. purna chander

    thkq. i got information which i was looking for.

    Reply
  7. Sanjeev Garg

    in method 3, DMMconnection, we can also recogonise if the LED glows after connecting with DMM as it is in series with 3V DMM supply.
    Also you have explained good methods. Thanks

    Reply
  8. nima

    Hello.thanks for this … I am a iranian … I like LEDs

    Reply

  9. Hello, i found your site at yahoo and you are providing interesting stuff. I like it,

    Reply
  10. Bruce

    Thanks for the info, one question though.
    What happens if i get the anode and cathode the wrong way around in a circuit? Nothing? Or something (BANG!)???
    Trivial question for ‘Trivial’ info.
    Thanks again.

    Reply
    • Elecrom

      nothing will happen. since led (Light Emitting Diode) is basically a diode which needs to be forward biased to operate. If you connect in wrong way, diode will be reverse biased and it will as as open circuit.

      Reply
      • arun

        led is a forward biased p-n junction diode.If anode and cathode are interchanged,diode becomes reverse biased.Therefore it is characterized by a peak inverse voltage.It is the maximum reverse voltage applied across the diode without burning the diode.

        Reply

  11. Regarding Method 2…..

    “Give a supply?”

    What is the recommended DC Voltage?

    Reply
    • Elecrom

      anything from 3 to 9 V.

      Reply

  12. thx.

    Reply

  13. Roger

    Perfect. Exactly the information I was looking for… trivial or not!

    Reply

  14. nice.
    It could be cool to add stuff for RGB led with common cathode or common anode.
    A little mistake in the shipment I received just gave me headache…
    sold to be common cathode, they were common anode.
    now, I understood..

    nice website!!

    all the best,
    julien

    Reply

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