LM386 based audio amplifier

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LM386 based audio amplifier: circuit and working. 




we will show you how to build LM386 Audio Amplifier Circuit. It is a very low-cost audio amplifier and can power any speaker. For the cost and size of the circuit, the sound from the LM386 Audio Amplifier can be adequately loud.
There are many Audio Amplifier Circuits designed using LM386 IC. The main problem with these circuits is noise and interference. The noise from the Amplifier Circuit designed in this project is considerably less and if designed on a proper circuit board, this will make a great Audio Amplifier.

  • Introduction to LM386

The LM386 is an all–in–one Class-AB Audio Amplifier IC that can be used in a variety of applications. LM386 IC has been in use for decades and is still being used as an Amplifier in Computer speakers and Portable Stereos.

LM386 is a low voltage power amplifier with an inactive power draw of 24mW, which makes it suitable for battery-controlled applications. The most common package for LM386 is an 8 – pin DIP. 

                

Schematic of LM386 Audio Amplifier Circuit



Before using this project, test it using the 6V battery. Connect the 8-ohm, one-watt speaker to output pin 5 of IC1 through C3. Switch on S1 and keep VR1 to its mid position. Now, take a screwdriver and gently touch it on input terminal pin 3 of IC1. You should hear a humming sound from the speaker. This will confirm that your circuit is working and ready to use.

  • Features of IC LM386

The main features of LM386 chip include the following.

  1. IC LM386 is obtainable in the package of 8-pin MSOP
  2. Exterior components are minimum
  3. Operation of Battery
  4. Low static power drain- 4mA
  5. The range of supply voltage is wide which is ranges from 4Volts to 12Volts or 5Volts to 18 Volts.
  6. Input is referenced by ground
  7. Distortion is less 0.2%
  8. Self-centering o/p static voltage
  9. The voltage gain range will be from 20 to 200

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