Home stolen phone automatic alarm circuit

This circuit can automatically alarm the designated telephone through the telephone line when the house is broken into. The designated telephone can be the 110 alarm number,
the office phone, or the phone of a neighbor or friend, so that the owner can monitor when he is not at home. Family security, achieving the purpose of preventing and treating theft.
    The circuit is shown in Figure 13-37. It mainly consists of two parts: a theft detection circuit and an automatic dialing circuit. The theft detection circuit is composed of micro vibration module
XDZ-01 and other components. NE555 forms a monostable delay circuit, and cooperates with surrounding components to form an automatic dialing circuit.
    When a thief picks the lock and opens the door, as long as there are two consecutive vibration signals acting on Al within an interval of 10s, the ② pin of Al outputs
high level , VT1 is turned on, and the ② pin of A2 is low level, the 555 circuit Enter the monostable delay state, pin ③ outputs high level, VT2 is turned on, the relay
is closed, Kl is closed to simulate picking up the phone; K2 is connected to the emergency call button on the phone that can be connected with one click, so that The phone automatically dials
the corresponding alarm number that has been stored in advance; K3 triggers the alarm sound music, so that the monitoring phone can listen to repeated alarm sounds after picking up the phone, and
take corresponding measures according to the prior agreement. The monostable ends, the relay is disconnected, the phone is restored, and an alarm process is completed. At ordinary
    times, when the owner opens and closes the door normally. A1 was vibrated for less than 1Os. Although the ② pin of Al also has a high-level output, due to the
short time, the charging voltage at both ends of C2 cannot reach 1.3V, VT1 is still cut off, and the subsequent circuit does not work. At the same time Rz. C2 delay. It also avoids
false alarms caused by short-term external interference.
    If the alarm music video can be replaced with a language recording and playback board, it will be more practical and convenient.
    During production, A1 uses the XDZ-01 emblem-shaped chip vibration module, which has internal circuits such as amplification, filter shaping, integration, delay and level conversion
. Its main electrical parameters: working voltage range 2. 4-6V. Typical value 3V. The limit value is 9V*3V, the quiescent current is less than
50ru:A, the output current is greater than or equal to 5mA, and the output time is greater than or equal to 1Os. AZ chooses NE555. A3 uses an alarm sound music circuit, and K
uses a JAG4-3 HA type dry reed relay. Other components are as shown in the figure, no special requirements.