Anti-theft alarm circuit
Source: InternetPublisher:天天都吃好吃的 Keywords: anti-theft alarm circuit sensor mobile Updated: 2021/09/29
It is a simple anti-theft alarm circuit , and the sensor uses pyroelectric sensor IRA-E100SZI. When human body movement is detected , the piezoelectric
buzzer will sound the alarm. The signal received by the sensor is amplified by the AC amplifier, and then converted into a DC drive transistor VT1 through the rectifier circuit.
When VT2 is turned on. Piezoelectric buzzer alarm. The gain of the amplifier in the circuit near a few Hz needs to be about 70dB. When a single-stage amplifier is not enough,
a multi-stage amplifier can be used to ensure the necessary gain. When the input signal generated by human movement is very weak, an optical system is generally used to amplify it.
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