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  • Works well

    posted by nevik on 10/16/2011

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


    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.


    No markings to indicate the input voltage polarity connections.

    Inductor is bulky and oddly positioned.


    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.


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

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