Help with amps and volts

Discussion in 'Electronics Resources' started by rajbps01, Jan 28, 2015.

  1. rajbps01

    Thread Starter New Member

    Jan 28, 2015
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    Hi Guys,

    Hope someone can help me. I have bought 2 cctv ptz camera. They use a 12v 1A output psu. Now i need to have this about 10 to 15 meters away. When I try to extend it the cams do not work. Can anyone help me please?

    Raj
     
  2. crutschow

    Expert

    Mar 14, 2008
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    Extend what?
    How do they not work?
     
  3. rajbps01

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    Jan 28, 2015
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  4. MikeML

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    What gauge of wire did you use?
     
  5. rajbps01

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    Jan 28, 2015
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    I been trying to use cat 5e so that I could use 1 cable only for data and power.
     
  6. rajbps01

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    Jan 28, 2015
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    I used 2 pairs to bring data and have tried with either 1 or 2 pairs for power
     
  7. MikeML

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  8. rajbps01

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    Jan 28, 2015
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    nope 1 per cable
    Have tried to double but still no joy :-(
     
  9. MikeML

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    Do the voltage loss calculation. I think you will see the problem....

    You could get a new 16V power supply;)
     
  10. rajbps01

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    Jan 28, 2015
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    16v 1a?
     
  11. rajbps01

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    Jan 28, 2015
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  12. MikeML

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  13. rajbps01

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    Jan 28, 2015
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    ok used a normal 12v psu.

    If the normal cable is used, it works. If i connect the ethernet cable, then i have 12.6v but as soon as i connect the cam the readings keeps jumping but never over 1. its always .456 or 685 or so. Those last 2 figures were just examples, goes too quickly to read properly.

    Pls advise.

    this psu is a 2 amps
     
  14. MikeML

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    You might have the wires in the ethernet cable crossed. I would expect the voltage at the camera to be a steady, but low value, like 9V or 8V. There should be a +12V connection at both the power supply and camera, and a 0V (gnd) connection at both the power supply and camera.
     
  15. rajbps01

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    Jan 28, 2015
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    Just double check and i been using the blue and blue/white and brown and brown/white for power.

    The other 4 cable, 2 pairs are working well as ethernet and can connect to it fine.

    So I am not sure anymore
     
  16. crutschow

    Expert

    Mar 14, 2008
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    Sounds like you may have the blue and brown cross wired.
    What does it do if you just use one pair of wires for the power?
     
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