The LM386 is a low power audio frequency amplifier which is very commonly used in small audio amplifiers. The IC consumes very less power and hence can be operated using a 9V battery easily. It can easily drive an 8-ohm speakerwith a variable gain of 20 to200. Volume control and gain control is also possible in this. The IC comes in a 8-pin PDIP package and requires very less components to function hence it is highly easy to use.
So, if you are looking for an audio amplifier IC which can be powered using a battery for a portable application to drive an 8-ohm speaker then this IC might be the right choice for you. For driving heavy speakers you have to use the power amplifier ICs.
LM386 Pin Configuration
Pin Number
Pin Name
Description
1,8
GAIN
Used to set the gain of the IC by connecting to a Capacitor
2
Inverting Input (IN-)
The Inverting Pin of amplifier is normally grounded
3
Non-Inverting Input (IN+)
The Non-Inverting pin is provided with the audio signal
4
Ground
The ground pin is connected to the ground of the system
5
Vout
Provides amplified audio output, connected to speaker
6
Vss/Vcc
Connected to power
7
Bypass
Bypass pin is used for connecting a decoupling capacitor
LM386 Audio amplifier features and specifications
Supply Voltage: 4-15V
Quiescent Power: 24mW @ 6V
Analog input voltage 0.4V (maximum)
Voltage Gain: 20 to 200 (26dB to 46dB)
PSRR: 50dB
Speaker impedance 4Ω
Available in 8-Pin PDIP,SOIC and VSSOP packages
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