Touch Doorbell DIY Experiments Science STEM KIT

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Touch sensor used here as a touch detector. The variation in the sense of touch wanted can be easily done by touching touch sensor using finger. The circuit operates normally over a DC voltage of 5V which can be obtained by DC supply cable

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Touch Doorbell circuit is presented here is based on the readily available touch sensor, comparator IC LM393 and relay. The touch? sensor is used as the touch detector while IC LM393 used as comparator. In the absence of touch, no touch detected on the touch sensor. As a result touch sensor stop conducting and buzzer stays off. However, when touch sense on the touch sensor, touch sensor starts conducting and buzzer sounds.

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