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Old July 24th 07, 09:39 PM posted to rec.radio.amateur.homebrew
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Posts: 5
Default Homemade piezo earpiece

On Jul 24, 12:07 am, "H. P. Friedrichs" wrote:
Just caught the tail end of this conversation, but thought you might
find this of interest:

http://www.hpfriedrichs.com/rr-pzphone.htm


Thanks Pete,
Very interesting indeed; perhaps I can convince the local library to
stock one of your books.

Christian


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