Why it matters
An amplifier cannot deliver power the supply cannot provide.
The supply voltage sets the available swing. The current rating affects how long the amp can deliver power into the load. Noise, grounding, and protection behavior can add hum, hiss, shutdowns, or failures.
How it works
A linear supply uses a transformer, rectifier, and large capacitors. It is simple and can be quiet, but it is heavy and inefficient.
A switch-mode supply switches at high frequency. It is compact and efficient, but layout, filtering, and quality matter. Many modern Class D builds use switch-mode supplies.
Batteries are also supplies. They need correct voltage, current capability, charging, fusing, and low-voltage protection.
Common mistakes
Simple example
Related concepts
Related concepts
Discussion
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