NAME-JYOTI RAWAT

AUDIO amplifier

It is a simple audio amplifier.

It is a low voltage power amplifier

It amplifies audio signal to some extent.

The heart of this amplifier is IC LM386.

Input is given through phone or pc.

INTRODUCTION

CIRCUIT DIAGRAM

Sr. No.

Name Value

1 IC LM386

2 Capacitors 100,220 micro farad

3 Capacitors(Ceramic) 0.01,0.047

4 Resistors 5kilo ohm,100,10 ohm

5 Power supply 12v,5v

6 Stereo jack 3.5mm

7 Copper clad 1

8 Speaker 8ohm

Component used

IC LM 386 is a low power audio amplifier integrated circuit.

It is an 8 pin IC.

In this amplifier only 7 pins are used. This IC operates on 9v supply.

This supply is given to pin number 6.

4th pin is always connected to ground.

IC lm386

PIN CONFIGURETION

An electrolytic capacitor is a type of capacitor that uses an electrolyte to achieve a larger capacitance than other capacitor types.

The voltage on the positive, terminal must always b greater than the voltage on the negative terminal.

ELECTROLYTIC CAPACITOR

A ceramic capacitor or disc capacitor a fixed value capacitor in which ceramic material acts as the dielectric.

Some applications of single layer ceramic capacitors are:-

Temperature compensation.Coupling and decoupling applicationsAC power supply and filter applicationsBypassing applicationsResonant circuit applications

CERAMIC CAPACITOR

There are many types of resistors, both fixed and variable. The most common types for electronics use is the carbon resistor. They are made in different physical sizes . The resister value and tolerance determined from the standard resistor color code.

RESISTORS

The signal to be amplified is coupled through a male 3.5 mm connector and then the signal fed to the input pin of LM 386. After that the internal circuits of IC amplifies the level of signal and then gives the output at pin number 5. The output signal is then pass through the 220 microfarad capacitor and then the signal goes to output by passing through a variable resistor. By varying the value of resistor the level of volume can be controlled. Then the output is fed to the speaker.

WORKING

This is a low voltage power amplifier according to its amplification factor it has some advantages as follows:-

The circuit of this amplifier is not so much complex so it is easy to make it.

This amplifier circuit uses capacitor and resistor and an IC, due to this the cost is very low.

By doing the proper matching of impedance a medium output can obtained.

The reliability of this audio amplifier is also high.

Advantages

The level of output is not that much high. To obtain high output multistage may be required.

The quality of sound is also low.

There is some amount of noise present in the final output.

 

Disadvantages

These are required in function, competitions, parties, speeches etc.

Audio amplifiers are used in devices like TV, Radio etc.

It can be used to listen songs in a single room.

Applications

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