Audio power amplifier

  
Output-clamp diodes are mandatory because loudspeakers are inductive loads. Output LR isolation is also used because audio amplifiers are usually expected to handle up to 2 µ¥ load capacitance. Large, supply-bypass capacitors located close to the IC are used so that the rectified load current in the supply leads does not get back into the amplifier, increasing high-frequency distortion.
Audio power amplifier  - schematic

Single-point grounding for all internal leads plus the signal source and load is recommended to avoid ground loops that can increase distortion.




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