fried LM324 quad op amp?



  • Is it possible for an LM324 to be damaged in such a way as all 4 op-amps still amplify but such a basic circuit fails?
    Hello, I am trying to use an LM324 quad op-amp to build a basic function generator but i suspect the chip may be damaged.
    When i perform a simple can-it-amplify test, all four op-amps pass: I attach a crystal earpiece to the +input, and an 8ohm speaker and a green LED to the output, and simply tap on crystal earpiece, and i get an audible click from the speaker and a flash from the LED when I perform this test on all 4 op-amps.
    However, i have tried multiple google-search function generator circuits and none of them work. I get no square wave, and no reading on my digital scope, including this circuit:
    [​IMG]
    Is it possible for an LM324 to be damaged in such a way as all 4 op-amps still amplify but such a basic circuit fails? I have tried constructing just the 1st stage and still get no square wave or output of any kind on pin 1.

    Any help appreciated.

    I didn't find the right solution from the Internet.

    reference:
    https://bit.ly/2IMNr6U
    B2B Online Video

    Thanks!


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