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  • Earthquake Detector Circuit

  • Created: Sep 08, 2014

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Summary

A seismic tremor (otherwise called a shake, tremor or temblor) is the consequence of a sudden arrival of vitality in the Earth's hull that makes seismic waves. The seismicity, seismism or seismic movement of a territory alludes to the recurrence, sort and size of tremors experienced over a time of time. The seismic tremors are measured utilizing perceptions from seismometers. The minute extent is the most widely recognized scale on which quakes larger than roughly 5 are accounted globally. The larger number of various quakes lesser than magnitude 5 reported by national seismological observatories are measured basically on the nearby extent scale, likewise alluded to as the Richter scale.


The MCP6143 is a single 600 nA op amp with chip select offering rail-to-rail input & output over the 1.4 to 5.5V operating range. This amplifier has a typical GBWP of 100 kHz with a maximum quiescent current of 1 microampere.


This design is a sensitive earthquake detector circuit that can be used to detect vibrations in the planet. The circuit utilizes the direct piezoelectric property of the piezo element used in buzzers. The Lead Zirconate crystals present in the piezo element can readily store current and can release the current when the orientations of the crystals are disturbed through mechanical vibrations. The MCP6143 (IC1) amplifies the signals from the piezo element and triggers the base-to-emitter junction of Q1. When Q1 conducts, pin 2 of the 555 timerwill be shorted to ground, to give a 3 minutes high output. This high output is used to sound alarm and to light LED. The variable resistor (RV) adjusts the sensitivity of piezo element. Glue the fine side of the piezo element on the floor (if used as an entry alarm) or inside a metal box (if used to bury in soil to detect earth borne vibrations).


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