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LM3886 Curiosity

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  • LM3886 Curiosity

    I have a Marshall AS50D in with a distorted output complaint. It turned out the LM3886 had a fair amount of crossover distortion with or without a speaker load.
    Never seen this before. So I replaced the chip - same problem. Checked the muting circuit - functioning OK. The problem was the 4.7K resistor R176 had drifted to 17K,
    so there wasn't enough current draw on pin 8 to take it completely out of mute mode.


    https://music-electronics-forum.com/...1&d=1572570811
    Attached Files

  • #2
    Nice catch!

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