DIY Bluetooth Boombox

Discussion in 'The Projects Forum' started by mrblanco11, Mar 1, 2016.

  1. mrblanco11

    Thread Starter New Member

    Mar 1, 2016
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    I'm using a ta2024 amp (http://www.parts-express.com/sure-e...4-class-d-audio-amplifier-board-only--320-330) to power 2 4ohm speakers and an 8ohm woofer. The signal will be coming from a cheap bluetooth module and alternatively from an aux cord. I'm making the signal mono so that I can double amplify the signal going to the woofer by splitting the 1st channel out, passing it through a low pass filter, and putting that through channel 2 out to the woofer. The entire thing is being powered by a 5v cellphone powerbank (http://www.amazon.com/gp/product/B0...ue&ref_=ox_sc_act_title_1&smid=A1HG0SD62RRE2I) with a step up dc-dc voltage converter (http://www.ebay.com/itm/XL6009-DC-A...576465?hash=item58cbb23751:g:QMUAAOSw~gRVs4zr) to get to the needed 12v to the amp. I need help wiring a volume control as well as a power button and maybe some led lights that will indicate power and battery level. The powerbank includes a power button and led lights but since its going to be inside the enclosure, I need a way to see/reach them on the outside.This is my first electronics project so any help is appreciated. Thank you.

    Diagram attached. Can also be seen here: [​IMG]
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,985
    745
    You cant take the input for the Bass from the output of channel 1, as the amplifier uses a bridge output method, you will need to take the inputs all together from the mp3 player.
     
  3. mrblanco11

    Thread Starter New Member

    Mar 1, 2016
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    The input is coming from the mp3 player, its just getting "double" amplified by going through the amplifier again through channel 2
     
  4. mrblanco11

    Thread Starter New Member

    Mar 1, 2016
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    0
     
  5. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,985
    745
    They're using an isolation transformer between the output and input, your drawing doesn't have one, so it wont work correctly.
     
  6. mrblanco11

    Thread Starter New Member

    Mar 1, 2016
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    Thats what the ground loop isolator is
    That's what the ground loop isolator represents. My mistake
     
  7. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
    1,190
    156
    Your amp circuit needs 2amps in order to run and the dc-dc converter can't supply enough current for it to run correctly. Personal I would rethink everything cause the amp your using is pretty big and will need a large battery ,unless you run lipo with multi cells.. But even with that you will need a special circuit to charge the lipo in order not to cause a fire ..(Lipo are very dangerous when missed use or not properly charged).. Most times these unit make a balance of weight and run time ..Hence why most are pretty light and not very loud IMO..
     
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