Aim

To understand the working of infrared transmitter and reciever and to design the circuit to understand their working.

Introduction

Infrared transmitter is a LED which transmit the photons in wavelength range of infrared waves.

Infrared transmitter is a photodiode which is used in reverse biasing and it enters into break-down region when any infrared photon is incident on it.

Apparatus used

IR transmitter

IR reciever

Circuit board

Wires

9V batteries and battery connectors

LED (5mm, 1.5V)

Resistors

Theory and working

Working of IR transmitter or IR LED

Working of IR reciever or IR photodiode

Circuit used in designing of IR transmitter and IR reciever

Sources of errors

Write yourself

Precautions

Do not connect any electronic component without resistance in series, it can burn the component.

Applications

In automatic switching on-off of lights, counters, security systems, theft alarms.

Bibliography

NCERT textbook of class 12

Physics by S.L.Arora

Circuits available on internet