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A Simple Reliable Power Amplifier with Minimal Component Count

We study an audio power amplifier that has three essential active components: two power MOSFETS and one operational amplifier. Such an amplifier will be reliable because MOSFETS have good safe-operating area properties, and there are no small semiconductors that require high voltage ratings. The topology is that of an op-amp directly driving a grounded-source complementary class-B MOSFET output stage. The center-tapped power supply for such an amplifier is floating, so each channel must have a separate supply, and there must be a small ±15-volt supply for the op-amp as well. We discuss the design and study the amplifier with simulations and an experimental prototype. It achieves good performance.

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