The M-980-02 is a general-purpose call progress tone detector operating from 2.8 to 5.5 VDC power supply range. It covers the common call progress frequency from 315 to 640 Hz featuring an inexpensive ...
This circuit was designed to detect when a call is incoming in a cellular phone (even when the calling tone of the device is switched-off) by means of a flashing LED. The device must be placed a few ...
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