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  • Works well

    posted by nevik on 10/16/2011
    0

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

    Pros:

    Good efficiency. I measured 81-83% over an input voltage range of 6-8.4V.

    Measured output current is virtually constant at 2.35A over the 6-8.4V input voltage range.

    Cons:

    No markings to indicate the input voltage polarity connections.

    Inductor is bulky and oddly positioned.

    OtherThoughts:

    At input voltages below 6V an electrolytic capacitor needs to be put across the input otherwise the driver becomes unstable and the output current drops markedly. I used 100uF during testing but a smaller capacitor should be OK.

    I shall probably change the diode and capacitor on the board as suggested in another review to raise the current capacity to over 3A and the operating voltage to 16V. I also might add some mods to make the 0.1 ohm current monitor resistor variable to provide a dimming capability.

    Bottomline:

    Cheap current source that has good efficiency and has the potential for further simple mods to increase its usefulness.

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