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LED's and resistors

Discussion in 'LEDs and Optoelectronics' started by sambo, Apr 12, 2013.

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  1. sambo

    sambo

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    Apr 8, 2013
    When trying to lower voltage to an LED, which leg of the diode (LED) do you solder a resistor to? Thanks.
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    That is utterly unimportant. Do as you like.
     
  3. gorgon

    gorgon

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    Jun 6, 2011
    The left one :)
     
  4. sheldonstv

    sheldonstv

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    Jul 17, 2007
    no thats totally wrong-the right one is better............heres a diagram showing you how.....
     

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    Last edited: Apr 13, 2013
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Let's not be confusing.

    When components like these are placed in series (see sheldon's image above), it doesn't matter whether the LED or the resistor comes first. If you have multiple LEDs in series, you can even place the resistor in the middle of the string.

    Most people tend to do it one way or another (for example, I almost always place the resistor on the anode end, but if I do otherwise, it doesn't matter.
     
  6. sambo

    sambo

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    Apr 8, 2013
    Thank you all for the resistor/ diode answers.
     
  7. davenn

    davenn Moderator

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    Sep 5, 2009
    Hi sambo

    we aim to please :)

    As Harald and steve said ... it doesnt matter has absolutely no effect on the operation of the LED

    just a point tho concerning your original statement, ... the primary purpose of the resistor ISNT for voltage dropping ( that's a side effect) but its purpose is to limit the current through the LED

    Dave
     
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