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Help with power supply

Discussion in 'Power Electronics' started by AkbarMna, Jun 11, 2018.

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  1. AkbarMna

    AkbarMna

    4
    0
    Jun 11, 2018
    Hi, so I'm working on a project that involves a camera and display.
    I'm going to be buying the camera and monitor online, these are the power-related specs from the seller.
    Can someone guide me in selecting a suitable battery pack to power them?

    Monitor
    - Power supply: DC 12V-24V
    - Power consumption: 2W

    Camera
    - Working Voltage: DC9V-12V±0.5V

    I've mainly worked with LED projects in the past, so I know a bit about how to wire those up.
     
  2. Alec_t

    Alec_t

    2,980
    806
    Jul 7, 2015
    Welcome to EP!
    According to those specs a 12V supply would suit both devices.
    How much current does the camera require?
     
  3. AkbarMna

    AkbarMna

    4
    0
    Jun 11, 2018
    Hi, thanks for the fast response.
    Here is all the information on the camera:

    1.Image Sensor:7070
    2.Video System: PAL/NTSC
    3.Resolution: PAL:682 H*504 NSTC: 648 H*488 V
    4.Horizontal Resolution:480TVL
    5.Electronic Shutter:1s-1/10000s
    6.SNR:>48dB
    7.Min Illumination:0.01LUX
    8.Video Output:1.0Vp-p/ 75Ω
    9.View Angle:170°
    10.Working Voltage: DC9V-12V±0.5V
    11.Waterproof Rate:IP67

    And this is a note from the seller "camera can only be connected to 12V, if you're wiring with voltage over 12V, the camera may burn."

    [mod edit: cleaned up some unintended smileys]
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    11,702
    2,717
    Nov 17, 2011
    This still lacks the information on current consumption or power dissipation :(
    Do you have a model number, link to a website with more information or similar for us?
     
  5. AkbarMna

    AkbarMna

    4
    0
    Jun 11, 2018
  6. Alec_t

    Alec_t

    2,980
    806
    Jul 7, 2015
    Comparable cameras advertised seem to draw current in the 50mA-200mA range, so a small 12V SLA battery would do the job. However, given the seller's warning about over-volting the camera I'd be tempted to use a voltage regulator to take the camera volts down to, say, 9V.
     
    AkbarMna likes this.
  7. AkbarMna

    AkbarMna

    4
    0
    Jun 11, 2018
    Thanks for the advice, I'll take your advice and start off with a 9V power supply.
    Thanks again.
     
  8. kellys_eye

    kellys_eye

    4,275
    1,147
    Jun 25, 2010
    No mention of how long the OP wants to actually RUN the system for on batteries.......

    This makes a significant difference to the solution.
     
  9. FuZZ1L0G1C

    FuZZ1L0G1C

    366
    118
    Mar 25, 2014
    If you have a DMM, and your camera battery or battery-cell housing is suitable, you can place a piece of stiff cardboard as an insulating barrier in the supply line (eg between batteries or one battery terminal and contact).
    Then take 2 lengths of insulated wire (I use solid hookup wire), either side of insulator, so that the connected meter is in Series with the supply & camera.
    For example, my DSLR Pentax uses 3x AAA cells, current varied from about 100-200mA, depending on function.
    My purpose was to roughly calculate mAh vs. maximum workable time.
     
  10. dave9

    dave9

    1,126
    307
    Mar 5, 2017
    Need more info about this project, purpose, weight/size/budget, frequency of use, link to monitor, etc, etc.

    There are too many variable to make a good guess but if I were to guess, it would be use an 18V Li-Ion power tool battery pack, so it is convenient to recharge and some have a built-in state of charge display on them, and a 12V, 2A rated buck regulator board. You may not need the whole 2A, but margin is nice to have and such can be had on eBay for around $2 delivered.
     
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