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Connections?

  • tim007 Saturday, May 18, 2013 4:37 AM Reply
    what are the 4 connections?

    I can't see it on the picture...
    If you use it for a 12V lead acid battery, when will the red led goes on?
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  • sheepish Top 10 Forum Poster Saturday, May 18, 2013 8:32 PM Reply
    3 of those pins are connected to each other on the back of the board, so you actually only have 2 connections.

    You could try using Report Error: Lacking Info to ask for better photos but error reports are not being answered at present.
    DX has found a new way to deceive customers:
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    http://club.dx.com/forums/forums.dx/threadid.1462252
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  • tim007 Sunday, May 19, 2013 1:01 AM Reply
    ook, no problem, 2 signals :)

    Vcc and GND(for DC)
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  • Nobzu Wednesday, October 11, 2017 12:54 AM Reply

    Does this product need brains to work since mine doesn't seems to work ? (tried with 3.7v and 9v batteries) How it' s supposed to work ? O.o

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  • sheepish Top 10 Forum Poster Wednesday, October 11, 2017 8:49 AM Reply

    mine doesn't seems to work


    I need more sleep for mine to work. Have you tried turning the potentiometer while the module is connected to a battery?

    DX has found a new way to deceive customers:
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  • Nobzu Wednesday, October 11, 2017 5:08 PM Reply

    Yep. Tried that. I can get it working somehow by connecting all 4 pins or putting my finger under the board covering resistor and all VCC + GNDs + IN

    Maybe mine is just broken ? O.o

    Is it supposed to work when you connect VCC and GND ? (while adjusting potentiometer ofcourse) 

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  • sheepish Top 10 Forum Poster Wednesday, October 11, 2017 5:50 PM Reply

    Um... @ebpDoug @desolder any ideas?


    What I said above is wrong, isn't it? Only two of those pins are connected together, right?

    DX has found a new way to deceive customers:
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  • desolder Top 10 Forum Poster Tuesday, October 17, 2017 7:23 AM Reply

    This appears to follow the reference/test circuit in the datasheet:

    https://www.elecrow.com/download/VU%20meter%20a%20led,%20KA2284.pdf


    You should only need 3 connections: Vcc, ground, and the signal you want to measure.

    What's up with the scrubbed LED driver IC markings?
    What are they trying to hide?

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