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Multiple 9VDC/250mA Power Supply

Discussion in 'Electronic Basics' started by Manchu, Feb 16, 2004.

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  1. Manchu

    Manchu Guest

    I have 12 CMOS security cameras that require 6-9VDC/200-250mA each. I
    have a power supply with an output of 13.7 VDC/2.7 A. I need to drop
    the supply voltage and current and also protect the cameras from
    possible power fluctuations. Any recommendations or possible
    schematics out there on how to build this power supply? Is there any
    web references? Any help would be greatly appreciated.
  2. John Fields

    John Fields Guest

    Bad idea.

    If you have a security application and the single power supply fails,
    then you no longer have a security system. Also, if a single camera
    fails and, for some reason, pulls the single supply down or takes it
    with it, then you also have no security system.

    What I suggest you do is get twelve regulated 7.5V, 250mA power supplies
    and connect one each to each of the cameras.
  3. Manchu

    Manchu Guest

    John Thanks, I had considered this but hoped there may be a way around
    this. The prospect of buying and placing 12 wall warts (and two power
    strips) is not too inviting. I had considered (1) Placing the power
    supply on an UPS (the UPS would be sized to the target duration, 45
    Min) and (2) placing an inline fuse to each load to protect the other
    cameras should one fail. I've seen some ideas on opposing Zener Diodes
    to control fluctuations and a few "one box" commercial applications
    for CCTV power but hoped I could do this as a project.
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