LM386 Audio Amplifier Circuit with Proteus Simulation
LM386 Audio Amplifier circuit is used in small battery operated audio devices like radio, audio players, etc. It is manufactured and design by Texas Instruments. LM386 is widely used for audio amplifier as it is specifically designed for low power applications. We will simulate the LM386 audio amplifier circuit using proteus simulation software. The circuit provided is tested and can be easily implemented. LM386 provides adjustable gain (a volume changing button) which helps to adjust amplification factor.
Know more about LM386 in Datasheet.
Internal Diagram of LM386 Audio Amplifier:
The default gain of the LM386 Audio Amplifier is 20 because of the 1.35K resistor attached internally between the 1st and 8th pin. The gain can be adjusted between 20 to 200 by connecting a RC circuit between the 1st and 8th pin.
Typical diagram of LM386 Audio Amplifier.
This is a basic diagram for the gain 20. Nothing is connected between 1st and 8th pin.
Complete Circuit Diagram of LM386 Audio Amplifier.
- LM386 supply
- 10K Pot
- 1uf Capacitor
- 47nf capacitor
- 10K resistors
Proteus Components Snap:
Select the below components in proteus.
Important Connections in proteus.
- At input select Generator from left panel and Select Audio and connect it.
- At output we have connected a speaker
- From left panel select the probe and connect at input and output sides.
- From left panel select graph and select Audio. Drag in the main screen.
- Select two graphs as we will require for input as well as output.
- Right click on graphs and click on Add traces. Select probe for each graphs respectively.
- At input audio right click and choose your .wav file. I have used bird.wav file. You can download from here: Bird.wav
Final Simulation of LM386 Audio Amplifier circuit.
- Right click on first graph and click run simulation. You will see a graph of your input audio waveform
- Right click on second graph and click run simulation. You will see a graph of your amplified output waveform.
Amplified Audio output: