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Personal Silent Alarm Systems Theory

2016-02-18 15:42  
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This article introduces the principle of personal silent alarm systems. Please read the text, and then look carefully circuit. The Personal silent alarm system is this: their TTY devices connected to the transmitter and detector separate phone jack on the same line. When the ring sensor detects an incoming call, it can activate the transmitter, the receiver transmits a radio signal to the pager unit. The receiver activates vibration motor drive intermediate circuit, so to remind the user's call. We realize ring detector and its connection to the transmitter. We also describe the circuit pagers, connect the receiver to the  vibration motor . Next, please carefully read the following diagram.

block personal silent alarm system