| Author | Message | | | eric | | Posted: Wed Aug 30, 2006 8:15 am Post subject: Vibration Detector | | | | Site Admin Joined: 01 Jan 1970 Posts: 311 | Pradeep G.
This little circuit may act as a vibration-activated burglar alarm.
The sensor, which may be secured unobtrusively to a door or
a window, is a an inexpensive piezo buzzer. Piezo ceramic
material deforms under application of voltage, but the reverse
also applies, i.e., a piezo ceramic element will produce a voltage
if it is deformed in any way, by acoustic waves (sound) or
mechanical vibration.
The first amplifier, T1, raises the piezo signal by about 100
times. Transistor T2 acts as a detector with a collector voltage
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