"Richard Crowley" writes:
"Jeff Findley" wrote ...
Most people think volume control as controlling the power output of
the amplifier. As you point out, it's not really since power
depends on the impedance of what you're driving with the amplifier.
It is equally dependent on both.
It wouldn't work any other way.
If you're driving a 100kohm cmos preamp from your headphone jack,
your ipod ain't gonna be burning a lot of battery life wiggling that
headphone output voltage against such a light load. It'd down in the
noise next to spinning the hard disk.
--
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