Indian Institute of TechnologyHyderabad

AM TRANSMITTER

SHANTH IC SHANTHI TEJA

S VIJAY SUSHRITH

P SHIVA KUMAR P SHIVA KUMAR

Amplitude modulation

Frequncy modulation

It is modulation frequency of the wave.

This type of transmission is complex.

FM radio ranges in a higher spectrum from 88 to 108 megahertz. (OR) 1200 to 2400 bitsper second.

Can send two channels at a time.

WHAT IS MODULATION?

• Modulation is process of varying one or more properties like frequency , amplitude, phase of periodic waves.

• AM and FM are two very popular and very different methods of sending information over the airwaves.

It is modulation of amplitude of the wave.

This type of transmission is simple and easily disturbed.

AM radio ranges from 535 to 1705 kilohertz (OR) Up to 1200 Bits per second.

Can send only one channel at a time.

Amplitude modulationAmplitude modulation is a technique used in electronic

communication, most commonly for transmitting information via a radio carrier wave.

AM works by varying the strength of the transmitted signal in relation to the information being sent.

In AM, a radio wave known as the "carrier" or "carrier wave" is modulated in amplitude by the signal that is to be transmitted.

It is used in both analog and digital communication and telemetry.

Range of modulator is small as compared to FM.

How does the signal transmitted?• This circuit designed to transmit the input signal with the

help of a carrier wave.• The input signal is too weak to travel long distance , so

we assist a carrier wave to the wave.• Now here we create carrier wave

by the help of RC oscillator in 555

timer chip.• The electrical signals are change

to electromagnetic wave with the

help of antenna.

SIMPLE AM TRANSMITTER CIRCUIT

ABOUT THE CIRCUIT

Potentiometers are commonly used to control electrical devices such as volume controls on audio equipment.

The 555 timer chip makes easy to connect the circuit.This chip creates the carrier wave of higher frequency. The audio signal is weak signal which cannot travel

long distances . So we assist carrier wave to carry

the our to the destination.