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Sonsivri > Electronics > General Electronics (Moderators: o2, pickit2) > How to detect the "busy nois"
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arash
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« on: January 17, 2006, 06:07:14 06:07 »
Hi.
Can you help me to detect the "busy nois" in phone line with pic"
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lm317
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« Reply #1 on: January 17, 2006, 11:02:24 11:02 »
Busy tone same as dial tone(440hz). Only differences are pulse times.
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