personal-silent-alarm-system

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The TTY and the detector-transmitter unit are connected to separate phone jacks on the same line. When the ring sensor detects an incoming phone call, it activates the transmitter, which sends an RF signal to the receiver in the pager device. The receiver activates intermediate circuitry which drives the vibrating motor and thus alerts the user to the incoming call.

In this section we describe the design and implementation of the ring detector and its connection to the transmitter. We also describe the circuitry in the pager that connects the receiver to the vibrating motor.