DC device working from outlet, but not working on batteries

Discussion in 'Electronic Basics' started by Nick Zalutskiy, Feb 2, 2007.

  1. I have one of these: http://www.ktnc.co.kr/product_04_01.asp
    Its a security camera.

    It is rated to work at 12V DC. They suggest that you should use a 300
    mA 12V dc power supply to connect to an outlet. When I do that, the
    camera works fine, note however, that all 12V psu (the ones you plug
    into the outlet) seem to provide somewhere around 18V.

    When I try to connect this camera to 8 AA batteries ((12.4V) or 8AA
    batteries + a 6V battery (18V) or 2x 9V batteries (dead batteries
    ~13V), all in series, the camera does not want to work. I have no idea
    why...

    Can anyone guide me in the right direction?
     
    Nick Zalutskiy, Feb 2, 2007
    #1
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  2. This is something like the setup I'm trying to make ( for personal
    use, if that matters, I'm a psychopath skiier =D ).

    http://cgi.ebay.com/Pro-Sony-520-li...ryZ23780QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

    I'm pretty sure they even use the same camera.

    One interesting observation about this camera. It has three wires
    going out of it: female power connector, BNC video signal, and an RCA
    remote (not connected in the final setup).
    If you connect the PSU to the outlet and only AFTER that connect the
    PSU to the power connector on the camera, the camera does not start
    properly, you see random noise on the screen or nothign at all.
    However, if you connect the PSU to the power connector and only then
    connect the PSU to the outlet the camera starts properly and you see
    an image on the screen. Not sure if this helps or not, but this was
    driving me nuts.

    Thanks in advanced,
    I really want this thing to work, going skiing tomorrow!!
     
    Nick Zalutskiy, Feb 2, 2007
    #2
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  3. Nick Zalutskiy

    default Guest

    This is tomorrow

    One assumes you got the polarity correct.

    Should work. Using rechargeable batteries with only 1.2 volts output
    (standard NiMH or NiCad) you would need ten cells to keep the camera
    happy. 8 cells is 9.6 V and that falls below the Sony spec. of +_10%.

    Lot of stuff today relies on micro processors or programmable
    controllers. If the power comes on slowly they don't reset properly
    and that might be what you are seeing with the connectivity issue.
    With batteries, and an on/off switch, that shouldn't be a problem.
     
    default, Feb 2, 2007
    #3
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