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Discussion in 'Security Alarms' started by Rich, Nov 7, 2005.

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  1. Rich

    Rich Guest

    I have an assorted pack of led's. No numbers lots of colors. How do I tell
    what resister to add in the circuit at 12 DC
  2. Robertm

    Robertm Guest

    Many LED's drop 1.2 volts across them so you have 12 minus 1.2 = 10.8 Volts.
    Assuming a current of 15 ma, you might try a 720 Ohm resistor. Not knowing
    the exact LED's you have, no one can say exactly. If you want to be on the
    safer side, start with a 1K resistor. Somewhere between 10 and 20 ma should
    provide sufficient brightness. Disclaimer: If you burn them up, I'm not

  3. Rich

    Rich Guest

    Thats ok we already did.

  4. Jim Rojas

    Jim Rojas Guest

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