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Old Jun 13, 2005, 7:27 AM   #6
Join Date: Apr 2005
Posts: 96

I designed once a small hand held terminal. First prototype had this high frequence noise, which turned out to come from a coil in the power supply.

Thats the only thing I can think of, except from the mic/speaker issue. Try to cover the speaker and see what happens ( or both the mic and speaker ).

Again - I do not experience this problem in my Z750.
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