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Old 11th Jun 2021, 2:14 pm   #13
Dave Moll
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Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 5,423
Default Re: "Duck" telephone

Originally Posted by rambo1152 View Post
has the seller given the mouthpiece a squirt of (electrically conductive) sanitiser that is causing the hum pickup?
I don't know whether sanitisation was the cause of a microphone problem, but while I was poking around checking component values, one lead from the microphone came adrift - and I found that with this now out of circuit I got a nice clear dial tone with no buzz. Once I soldered the lead back in place, the buzz returned. This at least narrows the problem down to the microphone circuit, even if not necessarily the microphone itself.

Whether I can source a replacement microphone is, of course, another matter.
Mending is better than Ending (cf Brave New World by Aldous Huxley)
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