DirecTV HR54-700 12V DC connector part number

Discussion in 'DIRECTV HD DVR/Receiver Discussion' started by krep, Jan 14, 2020.

  1. krep

    krep New Member

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    Jun 12, 2009
    Hello,

    Much to the dismay of various people here, I plan to use a 12V battery (possibly with a regulator circuit, I'm a EE) to power my DirecTV receiver directly, instead of using the AC to DC 12V brick. The connector is a weird guy, looks like this:
    [​IMG]

    Anybody by chance know what the part number is for this connector, so that I could buy it off of Mouser or Digikey or something, or should I just buy an extra power supply from Amazon and cut it off (but I would save the ~$8 if could get just the connector.)
     
  2. P Smith

    P Smith Mr. FixAnything

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    I would send the picture and dimensions (!) to Jameco/Mouser/Digikey email and ask for it.
     
    compnurd likes this.
  3. west99999

    west99999 Icon

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    May 11, 2007
    Why exactly would you want to do this?
     
  4. P Smith

    P Smith Mr. FixAnything

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  5. slice1900

    slice1900 Well-Known Member

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    Exactly how much time are you prepared to waste looking around for the exact part to save $8? (minus whatever the part costs plus shipping)
     
  6. krep

    krep New Member

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    Jun 12, 2009
    Great question. And the answer is, approx. 2 hours. I ordered the $8 AC-DC brick. :)

    Anyone else played with this kind of thing?

    While one could use an Inverter, the DC->AC->DC loss is multiplicative, and will probably end up terrible, I'm betting 60-70% of the max run time you could have gotten by going directly (minus a circuit to keep it at a clean 12V, if necessary) from the battery.

    Once I get the brick I'll check the power use plugged into a lab-grade power supply set to 12V DC. I can post the results here if anyone cares. I checked a PVR in my rack (also 12V) and was surprised at the difference.

    Here's what I got for the HR54-700 With DC brick:
    Min: 11W
    Avg: 11.5W (over a 13.05 hour period)
    Max observed: 16W

    Compared to the PVR (Samsung Security camera PVR):
    Avg: 12.3W
    DC P/S @ 12V: 0.6 A, = 7.995W. 66% efficient? What, that's terrible! Maybe there's some error tolerance or miscalibration in my ancient Kill-a-watt meter?
     
  7. P Smith

    P Smith Mr. FixAnything

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    I would offer to you use DC-DC high efficiency brick (98%) based on buck converter. I have old one, but nowadays you could find many of them what will suit you; they're taking wide range of DC input and will hold +12DC output for 24/7/365 without any problem, with overload , overheating protection, etc
     

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