LM386 IC Audio Amplifier Circuit

Share Button

With a few components, you can easily assemble a super amplifier using the lm386 IC.

The circuit consists of 1 electrolytic capacitor and a ceramic capacitor, resistor and one 10k pot. The main component is the operational amplifier IC.

The 10k potentiometer that adjusts the input audio signals and that has to be directly connected to the pin number 3 of the IC.

The battery connected in the PIN number 6 and the negative connection on the PIN number 4. The output will be taking from the PIN number 5 of the IC. we need to place A 1000uf capacitor in between the connections of the speaker to protect the IC.

LM 386 audio amplifier pin configuration and it’s working

The IC LM386 is a low power audio amplifier, that utilizes low power supply in electrical and electronic circuits. The IC is available in the package of 8 pin DIP.

PIN NUMBERDESCRIPTION
1Inverting pin connecting the IC to the external component.
2is the positive in that’s non-inverting pin is used to provide the audio
signal into the IC.
3is the inverting terminal and is normally connected to the ground
connection of the supply.
4is the ground pin connecting to the negative terminal of the battery.
5this pin used to provide amplifier on how to put and allied to the speaker.
6is connected to the power that means a positive voltage.
7the bypass connection is used to connecting the decoupling capacitor.
8is the gain setup pin

The features of LM386

  • The IC obtained in the package of 8 pins with DIP.
  • The exterior components are minimum.
  • low working voltage.

LM386 IC applications

bridge oscillator, power converters, ultrasonic drivers comma TV sound system, FM radio amplifier, preamplifier, audio boosters.

How to control the gain of LM386 IC

To make the LM 386 IC to the more versatile amplifier. Pin number 1 and pin number 8 are provided for controlling the gain of the IC.

a capacitor is put from the number 1-8 bypassing the 1.35 kilowatts resistor the gain will be 46 dB.

The resistor is placed in the series with the capacitor, the gain can be set in the value in between 20 to 200.

You choose the external circuit as your your comfort. Download circuit diagram

Leave a Reply

Your email address will not be published. Required fields are marked *