Question about Circuits (IR)

Discussion in 'General Electronics Chat' started by ssolitare, Dec 13, 2010.

  1. ssolitare

    Thread Starter Member

    Nov 29, 2010
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    Say in a DVD player, what are the things that need to be ON in order for the DVD to still receive IR signals?
     
  2. bertus

    Administrator

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

    There are more powersupplies in a IR controlled device.
    There is the switched main-powersupply and the standby-powersupply.
    The standby-powersupply powers the IR reciever and can switch the main-powersupply on.

    If you want to know more about the IR signals itself, take a look at the links of this page:
    http://www.educypedia.be/electronics/televisionrc5.htm

    Bertus
     
  3. mtripoli

    New Member

    Feb 9, 2010
    44
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    The POWER switch...?

    :D

    Mike T.
     
  4. ssolitare

    Thread Starter Member

    Nov 29, 2010
    34
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    lol mike.

    Speaking of the the standby power supply, functions like the internal clock still remain.

    Like if I wanted to make a DVD player where OFF meant that it still just receives IR signals and then executes from there, but there is no clock or anything else extra functioning prior to that.
     
  5. ssolitare

    Thread Starter Member

    Nov 29, 2010
    34
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    I am bumping this. :)
     
  6. bertus

    Administrator

    Apr 5, 2008
    15,648
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    Hello,

    You would still need a small standby powersupply for the IR reciever.
    It can be smaller as you do not need to supply the clock too.

    Bertus
     
  7. ssolitare

    Thread Starter Member

    Nov 29, 2010
    34
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    Edited this out.
     
    Last edited: Jan 17, 2011
  8. ssolitare

    Thread Starter Member

    Nov 29, 2010
    34
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    And this too.
     
    Last edited: Jan 17, 2011
  9. ssolitare

    Thread Starter Member

    Nov 29, 2010
    34
    0
    So I am coming back to this.

    Little energy is needed for this, so would it just make more sense to power the IR by battery?

    If the power source were from a wall, I am trying to picture how I would only take that very small amount of energy.

    Transformer and diode to prove the stable DC that I need, so then do I just pile on resistors to get the current down? Is there a more efficient way from a wall plug?
     
  10. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
    1,758
    98
    The circuit will only draw what it needs, a battery would be more wasteful.

    Get a Kill-A-Watt device (some libraries rent them) and plug your DVD player into it. See how little it draws in standby vs when on. Same goes for a TV.

    PS want to save energy? Check how much an old TV draws compared to a modern Energy-Star LCD.
     
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