Home > Circuit Bricks > Audio 1W Power Amplifier
UPDATED:.20:53 21 October 2013

FUNCTION BLOCK
DESCRIPTION
  • This is an audio power amplifier, designed to amplify audio signals loud enough to drive a speaker.
  • This amplifier can produce up to 1Watt of power.
  • It has very few components.
CIRCUIT DETAILS
  • The gain of this amplifier is set at 20.
  • The gain can be increased to 200 by placing a 10uF capacitor between pin1 and 8, (positive terminal to pin 1)

WARNING - At higher powers and voltages, the IC may get hot and need a small heatsink. Take care not to burn your fingers if checking it.

Input

Circuit Diagram

This should come directly from the wiper of a volume control or other decoupled audio source.

With the gain set at 200 it can amplify microphones directly via a volume control.

Output

The output should go directly to a speaker. Since the output already has a capacitor, another one in series with a speaker is not needed.

PACKAGE DETAILS
The LM386N amplifier comes in an 8pin DIL package.

Pin
numbers

When using ICs, it is always best to use an IC socket so the IC can be removed easily if needed.

Written by Phil Townshend - 2008
www.edutek.ltd.uk - Working Electronics For Students & Teachers