Audio Amplifier
Summary LM386 is a very popular and widely use 8 pin audio amplifier used to amplify sound signals. The circuit describe below can be used to amplify the sound signals from mobile output, CD player or it can be used in cars to amplify sound signal.
Description
To understand the working of circuit first we should understand its pin description-
Pin 1 and pin 8 is used for gain control of the amplifier.
Pin 2 and pin 3 is used to feed the input signal which is required to be amplified. Pin 2 is used for negative input and pin 3 is for positive signal.
Pin 4 is used as ground.
Pin 6 is used to connect DC power supply.
Pin 5 is used as output.
Pin 7 is used as bypass terminal with a capacitor to prevent oscillation.
Working of the circuit is very simple first we have to adjust its gain factor through pin 1 and 8 if it is left open the gain will be 20 as it is internally set in IC but it can be vary by adding a resistor and a capacitor up to 200. Now feed the required signals to pin 2 and 3. A variable resistor is connected to pin 3 to adjust the sensitivity of input signal and we will get output on pin 5.
C6 is used as current bank for output means when demand for current become low it supplies electrons or when sudden surges of current occur. C5 act as a coupling capacitor remove DC signals and passes only AC signals through it. And we will get the amplified signals through speaker.
Components Used
| IC | |
| IC1(LM386) |
1
|
| Resistor | |
| R1(1.2K) |
1
|
| R2(2.2E) |
1
|
| VR1(10K) |
1
|
| VR2(5K) |
1
|
| Capacitor | |
| C1(470uF) |
1
|
| C2,C3,C6(.1uF) |
3
|
| C4(10uF) |
1
|
| C5(47uF) |
1
|
| Miscellaneous | |
| Speaker |
1
|
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