Dimming LED circuit - CR123 or 2xAA

Discussion in 'The Projects Forum' started by theta, Jul 26, 2015.

  1. theta

    Thread Starter New Member

    Sep 25, 2012
    12
    0
    I am hoping to produce a circuit that allows for up to 5 low voltage, low output (perhaps a short LED rope light) to run from a single CR123 or 2xAA. I could potentially use 2xCR123 at a push.

    I have seen some 555 dimming circuits, along with the LM338 being suggested.

    How could I make an efficient, dimming circuit that will provide the most efficient output / longest battery life?
     
  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,771
    971
    How long do you need them to last?
    Do you need real "dimming" based on some type of input or do you just mean to have them be dim as to not draw as much power?
     
  3. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,813
    1,105
    What type of LED? Typical Vf? Rated max current?
     
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