In this tutorial, I will show you how to make an LM386 audio amplifier circuit. The LM386 is a low power audio frequency amplifier which is very commonly used in small audio amplifier circuit project. The IC consumes very little power, and it can be operated by a 9V battery. It can easily drive an 8 Ω speaker or two 4 Ω speakers. We can use volume control and treble control in this circuit. The IC also comes with an 8 pin PDIP package and requires very fewer components to work.
So, it is a low-cost audio amplifier IC which can be powered using a battery and also a portable device to drive an 8 Ω speaker then this IC might be the right choice for you. Here is a simple circuit schematic is given below.
The IC is powered using the pin 6 directly to the positive power supply and the ground pin 4 is directly connected to the ground. The inverting pin 2 is normally grounded and the Non-inverting pin 3 is provided with the audio frequency. This audio signal can be inputted from a 3.5 mm coaxial cable. A 10 KΩ resistor is also added in series with the audio signal to control the volume.
The pin 1 and pin 8 of the amplifier IC are used to set the gain of the amplifier. You can skip the pins for default gain which is 26 dB, but we can connect a 10 uF capacitor across it to get the maximum gain of which is 46 dB. Pin 7 is used to connect a filtering capacitor (0.1 uF) to avoid unnecessary oscillations. The amplified audio signal can be obtained from the output pin 5 which is connected to an 8 Ω speaker. It is also connected with a filtering capacitor whose value is 220 uF.
For Full Project Details Follow This Link Audio Amplifier Circuit Using LM386