BA5406 stereo amplifier.

BA5406 is a monolithic integrated stereo amplifier from ROHM semiconductors. It can deliver 5W per channel into a 4 ohm loudspeaker at 9V supply. Amplifiers based on BA5406 does 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, low thermal resistance and is available in a 12 pin SIP package.


In the circuit diagram shown below, BA5406 is configures 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 forms a Zobel network for the left output while C6 & R3 forms the same for the right channel. Purpose of the Zobel network is to reduce oscillations and improve high frequency stability of the amplifier. Potentiometers R5 and R6 serves 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.

stereo amplifier
BA5406 stereo amplifier


  • BA5406 requires a proper heat sink.
  • 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.


  1. Hi, what kind of a heatsink does BA5406 need? I tried to search for SIP package heatsinks, but nothing good came up.

  2. What is the function of capacitor and resistor at pin 4 and 7

  3. Can anybody let me know that what will be the capacitor’s voltage rating for this circuit?

    • Seetharaman

      All capacitors are 16 Volt DC working voltage or more up to 40 volt DC.

  4. Can anyone tell how to use single pot volume control for both channels??

    • Seetharaman

      Hi Rahul use a 22k stereo control (ganged control)

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