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Basic help - LM386 amp

Discussion in 'General Electronics Discussion' started by Wimbley, Feb 2, 2013.

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  1. Wimbley

    Wimbley

    5
    0
    Apr 23, 2011
    I have an odd issue with an LM386 amp I just wired up. I'm using the reference schematic from the datasheet for a 200 gain amp (minus the 10k resistor). The input is quite low, so even with the pot turned to max, I can just barely make out the source audio through the noise. Yet if I touch a lead on the pot, the gain increases considerably. I'm new to this (shocker), but any help keeping the volume up would be greatly appreciated.
    Thanks.
     
  2. davenn

    davenn Moderator

    13,833
    1,950
    Sep 5, 2009
    show us a clear well lit photo or 2 of your constructionso it can be checked over for any possible errors :)

    Dave
     
  3. Raven Luni

    Raven Luni

    798
    8
    Oct 15, 2011
    I've looked at the diagram in the datasheet. You say minus the 10k resistor yet you mention touching a pot. The only 10k resistor in that diagram is the input pot. If youre referring to the one at the output, thats a 10 OHM resistor.

    Other than that - what are you trying to amplify with it? The LM386 is a power amplifier and not a signal amplifier (so it is meant to follow a signal amplifier).

    Finally, make sure you havent missed any of the ground connections.
     
  4. Wimbley

    Wimbley

    5
    0
    Apr 23, 2011
    Sorry, I meant the 10 ohm resistor. I don't know how I had it hooked up the other day, but I put it together for a photo today and it's running well. I didn't realize it was a power amp, but as long as I don't blow the speaker, I think I can live with it.

    Thanks for the help.
     
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