Automatic alarm device for non-ring-off
An automatic alarm device and telephone technology, applied in the direction of telephone communication, electrical components, etc., can solve the problems of low automatic on-hook function, high production cost, inconvenient use, etc., and achieve the effects of diversified alarm methods, low cost, and convenient use.
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[0019] Below in conjunction with accompanying drawing, the embodiment of the present invention is described in further detail:
[0020] figure 1 The shown automatic alarm device for not hanging up the phone includes a telephone line inlet 1, a telephone line outlet 5, a busy tone alarm module 9, and a power supply 6. The telephone line inlet 1 is connected to the telephone line outlet 5, and the telephone line inlet 1 Connect the telephone line, the telephone line connection outlet 5 is connected with the telephone set through the telephone line, the input end of the busy tone alarm module 9 is connected between the telephone line entrance 1 and the telephone line connection exit 5, the busy tone alarm module 9 is connected with a power supply 6, the power supply 6 is powered by batteries.
[0021] The busy tone alarm module 9 includes a busy tone detection circuit 2 , a trigger circuit 3 and an alarm circuit 4 . The input end of the busy tone alarm module 9 is also the inpu...
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