Extending the portable playtime of an Android Smart led video projector

Discussion in 'General Electronics Chat' started by Bwatching, Jun 8, 2015.

  1. Bwatching

    Thread Starter New Member

    Jun 8, 2015
    2
    0
    Hello,
    I backed this projector on Kickstarter and it had finally arrived
    http://www.dosowls.com/odin/
    At full brightness (which it really needs to be at) the internal 7.4V battery only runs for 35 min. The AC to DC power supply is a 5.5mm 12V DC with a 3 amp fuse. If I want to run the projector off a car or 12V power pack do I just need to get a 5.5mm 12V 3amp car charger like this?
    https://www.amazon.com/gp/aw/d/B00BP2ZU0C/ref=ya_aw_oh_pii

    In addition all this got me thinking, I have a battery plate that takes a sony camera battery (running at 7.4v) and steps it up to 12v. It has a 5.5mm plug can I just plug that into the projector? Do I need the 3amp fuse if I am connecting DC? It seems the way the projector is designed it's always running off its internal battery. If I were to unplug the projector from the wall outlet all that happens is the battery icon switches from charging/charged to running off battery (like an android tablet). The last thing I want to do is blow it up by supplying too much power or power that should have gone through a fuse. The manufacture hasn't been much help in this. Only answerer I got was, Don't know, but let me know what happens. I figure the car adapter should be ok, because it has the fuse. The battery plate I have is used to power a blackmagic pocket camera for hours over its 30min runtime, which gave me the idea I could possibly use it for the projector as well.
    Thank you so much for your help!!
     
  2. pwdixon

    Member

    Oct 11, 2012
    488
    56
    You could always get a dc->mains module for your car and run the unit as though it was plugged in at home.
     
  3. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,813
    1,105
    Bear in mind that a 12V car battery is only nominally 12V. The actual voltage will typically be ~ 13.8VDC (higher if the car battery is being charged by the alternator). You really should use a fuse, since inadvertently shorting a car battery is DANGEROUS.
     
  4. Bwatching

    Thread Starter New Member

    Jun 8, 2015
    2
    0
    Thanks, I got the cable with the 3 amp fuse. I want to avoid using an inverter because one of the potential power sources is this
    http://goplugbags.com
    And they stated you lose half the power with the conversion, so they recommend trying to plug things DC if you can.
    I found a link to the battery plate I mentioned.
    http://www.bhphotovideo.com/c/product/1041084-REG/ikan_bmpcc_pwr_bc_s_cinema_camera_belt_clip.html
    This plate steps up 7.4 V batteries to 12V. Do I need to use a cable with a fuse with that's battery plate?
    Again thanks for the help!!
     
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