Stereo Amplifier Circuit using IC BA5406

IC BA5406 is small chip with two power amps which are made for stereo sound.

It works well, easy to use and needs few extra parts to build.

The circuit is good for home audio, portable devices and stereo projects.

This article for Stereo Amplifier Circuit using IC BA5406 tells how BA5406 works, its design and how to make stereo amp circuit with it.

Circuit Working:

Parts List:

This circuit uses BA5406 chip, resistors, potentiometers, capacitors and two speakers.

It gives stereo sound with good quality.

Audio signals (left and right) go to pin 5 and 8 through R5, R6, C11 and C12.

These parts adjust and filter sound.

BA5406 makes signals stronger to power the speakers.

Left and right sounds are handled separately for real stereo.

Stronger signals come out from pin 4 and 10.

Signals go through C2 and C5 to remove DC and then through R1, R2 (left) and R3, R4 (right) to filter.

C3 and C6 keep circuit stable and improve sound.

Two 4 ohm speakers give stereo sound.

It works on one +12V DC power to pin 1.

C9 and C10 keep power clean and stable.

Formulas:

Formulas for Simple Stereo Amplifier with IC BA5406:

Input Capacitor C11, C12 220nF:

These capacitors pass signal but blocks DC.

Keep low frequency safe with no sound loss.

Cutoff freq (fc) formula:

fc = 1 / (2 * pi * Rin * Cin)

where,

• fc is the cutoff frequency
• Rin is the input resistance of IC
• Cin is the input capacitor value

220nF capacitor value keeps fc low, so full audio passes.

Output Capacitor C2, C5 47µF:

These block DC and pass only AC sound to speaker.

Big capacitors keeps bass means with low frequency strong.

Cutoff frequency (fc) formula:

fc = 1 / (2 * pi * Rout * Cout)

where,

• fc is the cutoff frequency
• Rout is the speaker resistance
• Cout is the output capacitor value

47µF capacitor is good to keep low sound clear.

How to Build:

To build a Stereo Amplifier Circuit using IC BA5406 follow the below mentioned connections steps:

• Pin 1 connects to +12V DC supply
• Pin 2 connects to speaker1 one end through C4
• Pin 2 connects to C3 and R2 in series and then GND
• Pin 3 connects to pin 2 through C1
• Pin 4 connects to other end of speaker1 through C2 and R1
• Pin 5 connects to C11 and one leg of potentiometer R5
• Pot center leg is connected to audio left input
• Pot third leg is connected to GND
• Pin 7 goes GND through C10
• Pin 8 goes C12 and one leg of pot R6
• Pot center leg connects to audio right input
• Pot third leg connects to GND
• Pin 9 connects to other end of speaker2 through C7 and R4
• Pin 10 connects to pin 11 through C5
• Pin 11 connects to one end of speaker2 through C8
• Pin 11 connects to C6 and R3 in series and then GND
• Pin 12 goes to GND

Conclusion:

This Stereo Amplifier Circuit using IC BA5406 is low-cost, easy and gives good sound.

It is small and great project for many audio uses.

With good design and parts it works well for both hobby and for professional use.

References:

Datasheet IC BA5406