Telephone Locator. Sensor Circuit.3

You can easily attend a Telephone call in darkness using this White LED lamp. When the Telephone rings, the White LED flashes in sympathy with the rings. So sufficient light will be available to locate the phone to attend the call. This circuit is provided to explain the working of Optocoupler.
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IR Beam Alarm. Sensor Circuit.2

This is a highly sensitive broken beam alarm active both day and night. It uses invisible Infrared rays to inhibit the working of alarm generator. When the IR beam breaks, by a moving person, alarm will be activated. Ideal circuit as door protector.

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Morning Alarm. Sensor Circuit.1

This LDR based alarm can be used as wake up alarm. The Alarm turns on in the morning automatically and turns off only when manually switched off ,so you will have to wake up. It is a simple LDR based light sensor circuit.

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