USB Powered Speaker/Amp

Discussion in 'The Projects Forum' started by luvv, Jan 31, 2012.

  1. luvv

    Thread Starter Member

    May 26, 2011
    186
    31
    Hello AAC,

    Looking for a lil help to figure out which is the power pair on the board, and possibly I.D the chip .

    The board came from a usb powered speaker given to me by a friend already extricated from its housing and plug.

    He has hopes of modding it to boost the output from a tiny mp3 player .

    Rather that is plausible or not i don't know,but as always im willing to give it a go.

    Any info is appreciated,and if you have a easy cheap way to boost output from a mp3 player on battery power, love to hear it

    Thanks :)
     
  2. PaulEE

    Member

    Dec 23, 2011
    423
    32
    Power pair, V+ and V- in your second picture. +5v. Not much current from a USB port, though. Like a quarter to a half an amp, max?

    The chip you can probably google and find out more than I know off the top of my head...but if those wires are what goes to the chip, it is a USB controller chip, or a microcontroller with USB module, or........
     
  3. luvv

    Thread Starter Member

    May 26, 2011
    186
    31
    Thanks PaulEE,

    But erm, there is no V- only V+,D+,D-,PG,SG i know nothing about usb wiring protocals but kinda figured the V+ shared a common ground w/ D+ being D-.

    Just wanted to confirm it b4 i hit it w/ 5v.

    I have Google'd the chip only to get some random non related stuff, was hopeing someone here had some strong Google-Fu and could find it.

    Assumed it was a Amplifier chip as it has a volume up and down buttons on the same board along w/ a beefy speaker im not sure a basic pc sound card could power.

    Thanks again =)
     
  4. PaulEE

    Member

    Dec 23, 2011
    423
    32
    Educated guess: "PG" = power ground; "SG" = signal ground

    If you plug the usb cord into a computer and measure the voltages, you will probably find +5v between +5v terminal and "PG"...

    I'll look into the chip
     
  5. PaulEE

    Member

    Dec 23, 2011
    423
    32
  6. luvv

    Thread Starter Member

    May 26, 2011
    186
    31
    Thanks again PaulEE
    Your Google-Fu is indeed powerful =)
     
    PaulEE likes this.
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