So here this figure has to use the 3-volt battery as a power supply and regulate R2 register to obtain the necessary sensitivity.So fix the sensor firmly to the surface, where ever you place it and it is always good to place the sensor near to the doorknob. This is because, when inverting input has little effect when the LM358 IC is triggered and the state can't be easily inverted. The buzzer remains beeping for some time even f the vibration is detached.When the piezoelectric sensor has not activated the output from the piezoelectric sensor will be low and so do the output of the IC, So at a time output of the sensor is high and activates as a Schmitt trigger.The port R1 sets the threshold voltage of the circuit. Here shown in figure LM358 is connected in the inverting Schmitt trigger.In this circuit, a piezoelectric sensor is used as a shock sensor that has to mount on the door which you have to guard. The lousy old LM358 dual opamp (the LM324 is a quad) was designed to use a very low supply current therefore the output transistors are not biased properly which produces severe crossover distortion. The main application of this circuit is to as an anti-theft alarm in automobiles.The shock alarm circuit using LM358 is very easy to design and it has many applications from home automobiles.
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