amplify laptop speakers

Discussion in 'The Projects Forum' started by kdeff, Dec 5, 2010.

  1. kdeff

    Thread Starter New Member

    Dec 5, 2010
    2
    0
    Hi

    im trying to amplify my laptops speakers, possibly replace the speakers with more powerful ones.

    WOuld it be possible to use a single IC chip to do this? if so what would be a good one?

    thanks

    Raman
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,123
    3,047
    Read about the LM386.
     
  3. iONic

    AAC Fanatic!

    Nov 16, 2007
    1,420
    68
    Just plug the audio output of your laptop to the audio input of your computer speakers and your done!
     
  4. kdeff

    Thread Starter New Member

    Dec 5, 2010
    2
    0
    Hi,

    Ive been reading about that chip. but theres one thing I cant understand, how do I figure out what circuitry to put around the chip, or is the chip alone enough to apmlify speakers?

    Ive seen it hooked up both ways, alone and with other circuitry around it.

    thanks
     
  5. wayneh

    Expert

    Sep 9, 2010
    12,123
    3,047
    It needs a power supply, and the few components shown in the application notes in its datasheet.
     
  6. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    You will need an LM386 for each channel.

    The reason your laptop speakers aren't very loud is due to the size of them. On a Dell, the speakers are about 3/4" x 1/2", about 1/2" deep. There simply isn't room to fit "big sound" into a compact notebook. Larger notebooks do sound decent even with small speakers, but not micro sized speakers.

    Get some external powered speakers and plug them in the notebook's line out jack. This would be cheaper than building your own, and usually sound better than your first project.
     
  7. iONic

    AAC Fanatic!

    Nov 16, 2007
    1,420
    68
    +1 "thatoneguy". Sometimes you can get even $10 - $15 laptop speakers that will sound better than the laptops speakers, but doubling that price and you can get some really decent sound.

    iONic
     
  8. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    Here is a set of HP USB Powered speakers for notebooks. No extra power supply to worry about, plug into line out jack on notebook (3.5mm jack, often green), and another into USB for power.
     
  9. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    An LM386 amplifier has an output at clipping into an 8 ohm speaker of only 0.45W when it has a 9V supply. About the same puny power as a laptop's amplifier.

    My computer speakers have an amplifier with 3.5W each.
     
Loading...