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johnnyyy

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Everything posted by johnnyyy

  1. johnnyyy
    I'm looking for a converter that can convert the HDSDI and composite (or HDMI) signal to CAT5. The converter needs to have the function that can allow user to switch between HDSDI input and composite input. So it is like: 3G/HDSDI (input) + Composite/HDMI (input) ---> CAT5 (output). Does anyone know any manufacturer that makes these kind of device? Thanks for any input in advance. Johnny
  2. johnnyyy

    Newbie question

    johnnyyy posted a topic in General Digital Discussion

    Does anyone knows how IR sensor work in regular night vision security camera?
  3. johnnyyy

    Newbie question

    johnnyyy replied to johnnyyy's topic in General Digital Discussion

    I mean the photocell on the regular security camera panel (usually among the IR LED illustrators). How does it work and will the photocell adjust the IR LED power according to the power/light it receives?
  4. johnnyyy
    Hi, I'm new to CCTV, but have 4 years technical repair and system design experience. I would to start a business selling CCTV online in US. With limited resource, I hope to start selling analog camera first to test the water. I wonder: -What kinds of certificates are usually needed for CCTV in order to sale in US? -any advice on selling CCTV online? Thanks for any input in advance. Johnny
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