Sensor alarm circuit
Source: InternetPublisher:公子李 Keywords: Sensors alarm circuits vibration signals monostable circuits Updated: 2021/12/04
Circuit working principle: HTD1~HTDn. It is placed underground to form an acoustic vibration sensor detector
to detect the acoustic vibration signal from the ground . When someone walks about 1 m away from HTD
, the vibration signal of the foot on the ground is transmitted to HTD1-HTDn through the ground. After being received and amplified by VT1 and IC1
, it is rectified and filtered by VD1, VD2 and C4. The filtered DC
voltage is applied to the base of VT2, causing VT2 to conduct, triggering the monostable circuit to flip into a temporary stable
state.
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