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Mammano explains that these are simple, low-noise, and fast-responding. However, their fatal flaw is inefficiency . They dissipate excess voltage as heat. As he succinctly puts it, a linear regulator dropping 5V at 1A acts like a 5-watt heater. They are best for low-power or noise-sensitive applications (e.g., audio preamps, low-current sensors). fundamentals of power supply design mammano pdf portable