This project is a simple audio amplifier. It amplifies the audio signal to some extent. For amplifying purpose it used an IC and few more components. The heart of this amplifier is IC LM 386. The input to this circuit is given through the mobile phone or pc or any device which have 3.5mm connector.

1. NAME-JYOTI RAWAT

2.  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.

4. 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

5.  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.

7.  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.

8.  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 applications
 AC power supply and filter applications
 Bypassing applications
 Resonant circuit applications

9.  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.

10. 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.

11. 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.

12.  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.

13.  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.