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  • The Proff says Cheap and cheerfull.

    posted by Proff on 10/01/2008

    Involvement:Expert (understands the inner workings) - Ownership:more than 1 month



    Easy to solder longer wires to.

    Very compact.

    Brass body.

    Fixed focus.

    Current operated device.


    Not a sealed unit so dust can get in.

    Wires a little short.

    Easy to break wires of due to metal fatigue

    very flimsy wires.

    no built in regulator so you need to limit the current with an external resistor.


    Series resistor in ohms is calculated by supply voltage minus 4 divided by 0.045 amps.

    so r=12-4/0.045

    so the resistance r in ohms =

    the voltage is 12 volt

    minus the voltage across the laser 4 volt

    for maximum brightness you need 45 milliamps thats 0.045 amps

    so you need a 177.7777 ohm resistor just go up to the next highest value. 180 ohm.

    if you increase the current beyond 45 ma the laser gets dimmer and hotter and it burns out. with these things its always better it be safe and so go up to the next value of 200 ohm or 220 ohm. don't forget, if your using say a car battery on a running car it can go up to 14.5 volts which means the resistor would be

    14.5-4/.045= 233 ohms and add a bit on so say a 250 ohm resistor.


    I tested two of these to destruction so i hope the above helps. get it wrong and the laser is history in less than a second.

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