Mini Audio Amplifier

Rajkumar Sharma      http://www.rajkumarsharma.com  
6335
Project tested

MINI_AMP_PIC

This project is a mini Audio Amplifier based on LM386 IC.

Description

The Mini Audio Amplifier project is a good choice for battery operated gadgets.  It is based on Texas instruments LM386 IC, provides high quality Audio.

Specifications

  • Wide power supply input 6 to 12 VDC
  • 500 mW output @ 8 Ohms load
  • Takes standard audio signal as input
  • Low quiescent current drain 4 mA IC
  • The quiescent power drain is only 24 mW when operating from 6 VDC
  • Onboard preset for volume adjust
  • Header connector for connecting power supply, audio signal and speaker
  • Onboard power indication LED
  • On/Off PCB mounted slide switch for power supply
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 41 mm x 41 mm

Schematic

MINI_AMP_SCHEMATIC

MINI_AMP_Details

Parts List

MINI_AMP_BOM

PCB

One Response on “Mini Audio Amplifier

  1. The LM358 has crossover distortion and is too noisy for audio.
    The inverting opamp circuit shorts away most of the signal from the mic, it should be non-inverting with a much higher input resistance.

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