The LM 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 speaker with a variable gain of 20 to Volume control and gain control is also possible in this. 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.
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The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to PDF , 1. Extract from the document. The primary equipment used for the measurements consists of the System Two audio measurement system by Audio Precision , a digital multimeter DMM , and a dc power supply.
PDF , Kb , Revision: A , File published: Sep 1, This application report explains the different types of audio power amplifier configurations, such as the single-ended SE , the bridge-tied load BTL , and the fully differential audio amplifier. Each configuration is illustrated with a block diagram, gain equations, and an example using realistic scenarios to illustrate to engineers how to calculate the gain of their audio amplifier.
LM386 Amplifier. Datasheet pdf. Equivalent
Datasheet Texas Instruments LM386