Here, we are going to Discuss a simple telephone system. It is only possible for one way communication.

simple telephone circuit

The circuit consisting of a MIC, an Inductor, a battery and a loudspeaker.

Lets take a look on

How This Simple Telephone Works

A mic or microphone consisting of a cylinderical body in which its upper portion is covered by a diaphram and it is almost filled by carbon granules.

At normal condition the microphone offers a resistance and when we speak the diaphram vibrates and the offered resistance increase or decrease. Thus our sound waves are converted to Variable resistance and it will control the output Voltage.

This alternating voltage is fed to a loudspeaker after the amplification of signal, the amplification is made possible by means of an Inductor and a battery, finally the amplified voltage is converted back to sound waves.

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