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  • Ask incremental pulse adjustment

    Hello everyone, I made XR-71 circuit, but can not complete the probe, how to adjust it?

    Can someone explain this in detail the working principle of metal detectors do?
    Because the component is not enough, I use 9014 instead of BC546, Iuse 9015 instead of BC557,I use LM358 or NE5532 instead of TL062.:D
    Click image for larger version

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