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Old 11th Jun 2021, 8:29 pm   #16
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 7,339
Default Re: "Duck" telephone

I just read through the thread from beginning to end and by about half way through I was thinking 'I know what this is' because the electret microphone elements in some gear we make at work commonly fail in that way, producing a loud buzz instead of the expected audio output. Replacement of the microphone element always fixes it.

And then when I got to the end I discovered you had already found that out.
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