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July 24th 07, 09:39 PM
posted to rec.radio.amateur.homebrew
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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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