Dual LM386 IC Pedal.

Discussion in 'The Projects Forum' started by Alan410, Apr 19, 2014.

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  1. Alan410

    Thread Starter New Member

    Apr 16, 2014

    I followed a schematic : http://www.runoffgroove.com/littlegemMK2.png

    And ended up with a near satisfactory amplifier.

    I bridged the 10uf capacitors and replaced it with a 10k pot that adds distortion.

    The problem is that when I connect my guitar, I get no audio at all. If I connect it to my computer I get sound.

    Also there is alot of background noise.

    I removed the JFET that was supposed to be there because I didn't have one, it still works without it, not sure what it was for in the first place.

    My distortion is also a bit messed up, having the my pot off (lowest) and then turning it up lowers the sound, but then builds up to the highest volume.

    So problems I have are:

    No sound from guitar.
    Bad/strange distortion
    Bad quality sound

    Any way to fix this?
  2. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    hi Alan,
    The FET provides a high input impedance for whatever is the source of the input signal, in your case the guitar.

    Post a diagram showing how you have the guitar > LM386's > Computer interconnected and powered.
  3. bertus


    Apr 5, 2008
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