₹380 – ₹666
- Product Code: LGKT125
- Power supply: No battery included, Includes DC adapter if required with the kit
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This circuit simulates a seismic sensor to detect vibrations/sounds. It is very sensitive and can detect vibrations caused by the movement of animals or human beings. So it can be used to monitor protected areas to restrict entry of unwanted persons or animals.
In the circuit, IC TLO71 is wired as a differential amplifier with both its inverting and non-inverting inputs tied to the negative rail through a resistive network comprising both the inputs receive almost equal voltages, which keeps the output low. When the piezo element is disturbed (by even a slight movement), it discharges the stored charge. This alters the voltage level at the inputs of IC and the output momentarily swings high as indicated by green LED. This high output is used to trigger switching transistor, which triggers mono-stable IC 555. The timing period of IC 555 is determined by resistance and capacitance value.
- Dimensions (cm) LxWxH: 15 x 15 X 10
- Weight (kg): 0.5