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how to connect this laser pointer to wall outlet?

Discussion in 'Electronic Basics' started by James, Aug 10, 2004.

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  1. James

    James Guest

  2. Rich Grise

    Rich Grise Guest

    A 4.5V wall wart, probably at least 500 mA, with two additional
    plugs spliced onto the cord. For the pointers themselves, a wood
    block the size of the 3 batts, with metal tabs where the contacts
    are. Connect these tabs to the mating connector, and figure out
    a way to attach that to the package, and you're good to go.

    Watch out that the voltage of the wall wart doesn't go too
    high when there's only one pointer plugged into it. If worse
    comes to worst, put a 5.1V at least 1W zener to limit the voltage.
    (I assume the internal resistance of the supply will limit
    the zener current - that's what limits it when there are pointers
    plugged into it, after all.)

    Have Fun!
  3. Clint Sharp

    Clint Sharp Guest

    Make sure the pointer has a proper laser drive circuit. Many don't and
    the one referenced above looks very familiar.
  4. James

    James Guest

    laser drive circuit?
  5. Clint Sharp

    Clint Sharp Guest

    A circuit that regulates the power dissipated by the laser diode by
    monitoring the output from the laser diode's internal photodiode. Many
    laser pointers are just a 'chip' with a bare bond wire and have no kind
    of drive circuit, they are very easy to destroy with too much current.
  6. Gary Lecomte

    Gary Lecomte Guest

    What a Rip-off Price. That laser pen in B.C. Canada, sells for $1.00
    Canadian, thats about $.75 US. Also that particular product has a BAD
    Failure Rate.
    There is a Better brand out there that is as cheap and more relilable.

    Those particular lasers only use a Series Resistor for current
    regulation. Add another resistor in series of an appropriate value and
    you can use any voltage adapter.

    See my Laser Alarm Project, It Might help you.

    Take care.........Gary
  7. James

    James Guest

    that link didn't work.
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