DX » Community » Reviews » 3.6V 5-Mode 3W Circuit Board for Flashlights (1000mA 3.7V Output/2-PCS)
5.0
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  • Doesn't provide enough juice for a Q5

    posted by asdasd123123 on 05/17/2008
    0

    Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month

    Pros:

    Does what it's supposed to, lights up an LED from lithium batteries.

    Has five modes, high/low/slow strobe/fast strobe/really slow strobe.

    Runs cool, even pumping a low 70% to the Cree Q5 LED's, they still get brutally bright.

    Cons:

    Doesn't provide 1000mah, and really, it never could with only one transistor.

    The best one draws 700mah from the battery, and that's the one that broke partially. The other chip draws 600mah.

    It worked a week, and then strobe and low modes stopped working, it "pumps" in a strange way on all but high mode.

    Low mode flickers considerably, <60hz and isn't really useful as a flashlight if the flashlight needs to be a worklight.

    OtherThoughts:

    SKU7612 is a better chip, at least on the whitepaper, as it should work better with three transistors.

    DX should try to get hold of simpler two-mode chips, as low and high is usually all you need.

    When you need to switch modes back and forth, it gets real annoying after a while.

    This doesn't provide enough current, and possibly a Q5 will in fact overload the chip, seeing as one broke after a while.

    May be better suited as a 700mah part.

    I'm using a calibrated fluke multimeter, and my readings should be accurate.

    The pre-soldered cables was nice to have, as these boards are ridiculously small.

    If you have anything but a soldering station with a needle tip, you won't be able to solder on these.

    Bottomline:

    It pretty much does what it's supposed to, albeit the specs are exaggerated, the five modes do work as intended.

    It provides a LOT of light, even when not pumping enough to a Q5 LED.

    In short, it works pretty well for a cheap and small device.

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