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LEDs in flashlights?

Discussion in 'Electronic Basics' started by DaveC, Jul 17, 2004.

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  1. DaveC

    DaveC Guest

    Such as this one:

    http://www.brightguy.com/detail.html?cart=1090077700192795&sku=OPA3W

    how are the LEDs configured? Are they paralleled? Each with a series
    resistor? Regulator?

    In this application, the source is 2.4-3.0 volts, depending on type of cell.
    Any idea?
    --
    Please, no Google links. I wouldn't ask a
    question here if I hadn't done that already.

    DaveC

    This is an invalid return address
    Please reply in the news group
     
  2. Gareth

    Gareth Guest

    There are switched mode power supply ICs designed to drive white LEDs.
    It could well use one of these. Certainly that would give the constant
    light output they claim:

    "The light output of the NewBeam LED module maintains a perfectly
    constant level for almost all of the batteries' useful life"

    For an example of such an IC have a look at:

    http://pdfserv.maxim-ic.com/en/ds/MAX1553-MAX1554.pdf

    Gareth.
    --
     
  3. dan

    dan Guest

    What's that Lassie? You say that DaveC fell down the old
    sci.electronics.basics mine and will die if we don't mount a rescue by
    Sat, 17 Jul 2004 08:17:11 -0700:
    They use a switching power supply. Ask about it and other LED drivers
    here:
    http://www.candlepowerforums.com/ubbthreads/ubbthreads.php
     
  4. I have two Opalec Newbeams installed in my mini maglites, and I use them
    all the time.

    The Newbeam is not focused, so turning the head of the maglite does
    nothing but turn it on/off. There is a circuit encapsulated in epoxy,
    so you can't see what's in the circuit. My guess is that there's a chip
    in there and the three LEDs are in series. Buy one and find out.
    Another model is the Techass MagmaLED which is a single LED, and it is
    focusable. www.techass.com
     
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