Monday, November 22, 2010

2x3W Stereo Amplifier based on BA5406

The following diagram is the schematic diagram of stereo audio amplifier which able to deliver the power output up 3 W on each channel. The amplifier circuit powered with single power amplifier chip BA5406.

2x3W Audio Amplifier with IC BA5406 circuit
Component part list:
R3, R4 = 2R2 ohm
R1, R2 = 120 ohm
C1, C2, C11, C12 = 220nF
C3, C4, C5, C6, C7, C8 = 47uF/16V
C9, C10 = 470uF/16V
IC = BA5406

The BA5406 is a dual-OTL monolithic power IC with two high-output, low-frequency power amplifiers. With a 12V power supply, it has a rated output of 5W x 2 into a 3W load, and with a 9V power supply, it has a rated output of 2.8W x 2 into a 3W load.

The BA5406 has good low-voltage characteristics, and the “pop” sound when power is applied is small. It generates little radio-band noise, and is ideal for use in stereo radio cassette players.

Download 2x3W Audio Amplifier with IC BA5406 in PDF version
Download BA5406 datasheet

About Audio Amplifier
An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain.

The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification, equalization, tone control, mixing/effects, or audio sources like record players, CD players, and cassette players. Most audio amplifiers require these low-level inputs to adhere to line levels.

While the input signal to an audio amplifier may measure only a few hundred microwatts, its output may be tens, hundreds, or thousands of watts. More explanation about power audio amplifier can be found at

This is a video tutorial about how to a very simple audio amplifier based on the LM386 amplifier chip. It can be built for less than $20 (or might be less than $8 in some countries) and used to amplify any low level audio signal including a guitar, bass or mp3 player.

Watch the video:

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