Monday, February 13, 2012

stereo power amplifier circuit with BA5417

BA5417 is a stereo audio amplifier IC with a lot of good features such as thermal shutdown, job readiness, soft clipping, and a wide operating voltage and so on. IC can deliver 5W per channel to the loud speakers 4 ohms at 12V DC supply voltage. BA5417 and excellent sound quality and low THD (total harmonic distortion) is about 0.1% at F=1kHz; Pout=0.5W.


Setup and working of this stereo power amplifier circuit is somewhat similar to the BA5406 based stereo amplifier circuit published previously. C10 and C11 are DC decoupling capacitors which block any DC level present in the input signals. C2 and C6 couples the amplifiers left and right power outputs to the corresponding loud speakers. C1 and C5 are bootstrap capacitors. Bootstrapping is a method in which a portion of the amplifiers is taken and applied to the input. The prime objective of bootstrapping is to improve the input impedance. Networks R1,C3 and R2,C7 are meant for improving the high frequency stability of the circuit. C4 is the power supply filter capacitor. S1 is the standby switch. C8 is a filter capacitor. R3 and R4 sets the gain of the left and right channels of the amplifier in conjunction with the 39K internal feedback resistors.

Circuit diagram.

 BA5417 stereo amplifier circuit


  • Supply voltage range of BA5417 is from 6 to 15V DC.
  • The recommended supply voltage for this circuit is 12V DC.
  • The power supply must be well regulated and filtered.
  • BA5417 requires a heatsink.
  • The circuit can be assembled on a perf board without much degradation in performance

 tags: supply, voltage, stereo, circuit, power amplifier


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