BA5406 stereo amplifier schematic circuit diagram

BA5406 is a monolithic integrated stereo amplifier from ROHM semiconductors. It can deliver 5W per channel into a 4-ohm loudspeaker at a 9V supply. Amplifiers based on BA5406 do not require an output coupling transformer and can be operated from a single supply. The operating voltage range is from 5 to 15V DC. This makes the IC suitable for low-power car audio applications. Other applications of BA5406 are portable audio players, stereo component systems, television, etc. The BA5406 has great channel separation, good channel isolation, small pop-up noise, low noise, and low thermal resistance and is available in a 12-pin SIP package.

Features of BA5406

  • Good low voltage characteristics (Operation from Vcc=5 V)
  • Ripple filter (6pin) also can be used as a muting pin (Make 6pin GND potential)
  • Small thermal resistance package and simple heatsink design


In the circuit diagram shown below, BA5406 is configured to deliver 5×2 watts into 4-ohm loudspeakers at a supply voltage of 9 volts. Capacitor C3 is a power supply filter capacitor. C11 and C12 are input DC decoupling capacitors for the left and right channels. C3 and R2 form a Zobel network for the left output while C6 & R3 form the same for the right channel. The purpose of the Zobel network is to reduce oscillations and improve the high-frequency stability of the amplifier. Potentiometers R5 and R6 serve as the volume control for the left and right channels. CapacitorsC4 and C8 couple the outputs of the amplifier to the speakers. C9 and C10 are noise-filtering capacitors. C1 and C5 are bootstrap capacitors for the left and right channels.

Circuit diagram

BA5406 stereo amplifier schematic circuit diagram


  • BA5406 requires a proper heat sink.
  • The supply voltage range is 5 to 15V DC.
  • I used 9V DC for powering the amplifier.
  • The power supply must be well-regulated and filtered.
A capacitor is a device that stores electrical energy in an electric field. It is a passive electronic component with two terminals. The effect of a capacitor is known as capacitance.

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