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(Jay) wrote:

}I am trying to find a way to record telephone conversations to my PC,
}(legal, for training purposes only). I have an interface that plugs
}into a cassette recorder and that works fine on the cassette. I have
}tried this same interface plugged into my computer, either line-in or
}the microphone jack, but when I record I get a loud hum noise and I
}can faintly hear myself in the background, though I have to talk or
}whistle loudly to do so. Apparantly I need a different interface. I
}have found them for sale for around $50, but I would prefer to make my
}on, usually these interfaces use fairly simply filter circuits. Any
}suggestions?

Yes...google.

Try: phone computer record interface circuit

Stan.