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Circuits
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. |
