Connect with us

axis 2100 cam refuses to work on 12v DC

Discussion in 'Electronic Design' started by lentildude, Mar 22, 2007.

Scroll to continue with content
  1. lentildude

    lentildude Guest

    I have an axis 2100 webserver cam that runs from a 12vac plugpack. I
    want to run it on 12v dc and it refuses to work. It seems to want ac,
    perhaps the 50hz for a clock or something.

    I DONT want to have a 12v>240v inverter just to run this as
    the camera will run from a car battery and solar panel so dont want
    to
    waste power. Can I trick the camera by somehow making a 50hz
    oscillator and somehow mixing it on the gnd line of the 12v dc??
    Im not sure how to do this.


    Any tricks/tips/links to a circuit appreciated.
     
  2. Jamie

    Jamie Guest

    it most likely needs both a + and - voltage source internally.
     
  3. John Bordynuik selects "Can I trick the camera by somehow making a 50hz
    oscillator and somehow mixing it on the gnd line of the 12v dc??"

    A thyristor bridge inverter could provide 12VAC from 12VDC. This is
    probably your best bet. How much current?

    Regards,

    John Bordynuik
     

  4. Wrong. A lot of those AC powered cameras have an internal power
    transformer and use a 12 VAC input to allow them to be classed as a "Low
    Voltage Device" which does not require the wiring to be installed by an
    electrician.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  5. lentildude

    lentildude Guest

    John Bordynuik selects "Can I trick the camera by somehow making a
    50hz
    oscillator and somehow mixing it on the gnd line of the 12v dc??"


    A thyristor bridge inverter could provide 12VAC from 12VDC. This is
    probably your best bet. How much current?


    Thanks for replies, It need at least 1 amp. It will be running off
    a car battery (solar charged)
    so needs to be a simple reliable and efficient 13.8vdc to 12v ac
    inverter.

    Do you have a link to such a circuit?

    (Come to think of it I have a 24v ac irrigation solenoid that I would
    also like to run off a car battery)
     
  6. lentildude

    lentildude Guest

  7. mpm

    mpm Guest

    Mike,
    Are you referring to NEC Code here?
    Because wouldn't 12vdc ALSO be considered a low voltage device??
    I don't have the codebook in front of me, but I thought the cutoff was
    50volts (DC or AC, makes no difference??)

    I would think it more likely they're just saving costs.
    A typical DC wall wart cost more than a similar power AC style.
    By many dollars in most cases.

    -mpm
     
  8. Jamie

    Jamie Guest

    Well that sounds like hog wash to me but what ever, if you say so.

    I for one know for a fact that many device require AC only input
    because they require a dual rail supply also, many devices create a
    virtual - reference which makes it not possible to share the the sources
    common.
     
  9. Jamie

    Jamie Guest

    50 volts is the cut off.
    anything under that is not Nec regulated how ever. That was covered in
    our last refresher course we need talk once a year.
     
  10. We referred to that as extra low voltage - 120/240 was low voltage to us.
     

  11. You don't get as much isolation for multiple cameras with a common DC
    source, but a number of cameras can run from the same AC source with no
    ground loops. Yes, a super cheap camera that is not made for multiple
    camera installations can get away with a really crappy wall wart, but
    some of the security cameras are still made for AC operation, to replace
    failing vidicon cameras without rewiring. If the camera calls for AC,
    that's what it needs.

    Low voltage is typically in the 24 volt, or less range for AC. it is
    also referred to as "Class 2" wiring. Sound systems with 25 volt line
    output are just barely "Class 2".

    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     

  12. Your education is sorely lacking when it comes to ground loops in
    Video Systems. Cameras that operate on "Class 2" AC wiring have been in
    use for over 40 years for very valid reasons. Why do you need a dual
    rail, when a 7660 chip will give you a few mA for bias, or to power a
    couple op amps? Its cheaper and more reliable.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  13. Jamie

    Jamie Guest

    oh go pound sand, we have camera's all over the place at my place of
    employment, i service them quite often. I have never had any issues with
    them as you speak of. when i do, you'll be the first one to know.
    we have a variety of ones that operate from low voltage AC,DC, 120 AC
    etc.. connected in the video stations...

    Like i said, I'll let you know when i run into issue.
     

  14. Its "Cameras" dumbass.


    They have my pity.


    No, you've told me that you know everything and claim to never be
    wrong so all I will do is smile and hit "delete"


    Tell me, "Never Wrong", just how much hum was to be imposed on the
    coaxial shield before it will show up in the picture?



    You don't think much of yourself if you can't even use a capital "I"
    when referring to yourself.


    You are an issue. I have serviced cameras from the early '70s,
    including studio color cameras for broadcast stations. Half assed, low
    res security cameras are a joke, and you know it.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-