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    I use exactly JVDE's schematic, yes, there is not...

    I use exactly JVDE's schematic, yes, there is not much to improve.

    The diodes between ring and ground can be normal ones or a schottkies, this makes no difference, as the ring is a digital input...
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    @JVDE Thank you for the basic...

    @JVDE
    Thank you <<very much>> for the basic information and the schematic :clap2:

    After successfully building a prototype, I want to suggest some improvements:

    in case the ring is to be...
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