Lm 7805 to power up an lm1881n

Discussion in 'The Projects Forum' started by elperg, Sep 28, 2009.

  1. elperg

    Thread Starter New Member

    Sep 28, 2009
    2
    0
    Hi to all
    I need some suggestions according to a project that i am working on.
    Basically all i need is to enhance the Csync of a DVD player and send it to the ICS unit in my car. The only problem is how to power up the LM 1881N that needs 5V (stable). I can do that from the USB port that the DVD has but I need that port for external devices like flashes cards etc. So i am thinking of using the car supply (12V - 14V) and convert it to 5V. For that purpose I am using an LM7805. First of all I would like to ask you if I am going to have troubles with the heat (because the circuit is in a plastic box). Second I really want a schematic on how to use the LM7805 in order to have a sufficient power supply and don't destroy anything else!!! I am not sure but i heard that the LM 1881N needs 10mA (if someone knows anything about it I would appreciate it).
    I built the circuit with the LM 1881N and now the only thing is to power it up.
    Thanks for your time.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    The LM1881 is a video sync separator.
    The LM1881 will work from 5 to 12 Volts.
    The maximum current drawn is 12 mA.
    See also the attached datasheet.

    Greetings,
    Bertus
     
  3. elperg

    Thread Starter New Member

    Sep 28, 2009
    2
    0
    Thanks for your response.
    The car when its on, it can gives up to 14V so there will be a problem in LM 1881N
    If you know how to build the circuit with LM 7805 to power up LM 1881N I would appreciate it.
    Thanks again
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    Here is a schematic for the LM78XX.

    [​IMG]

    You can use the 7805 , 7808, or 7809 for the LM1881.

    Greetings,
    Bertus
     
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