> > 2x voltage would actually be 6dB (this is one of those little
confusing
> > things they kinda slip past you. 3dB is double POWER, which would
only be
> > sqrt(2) times the voltage. 6dB is double voltage.

> Wait... now I'm confusered. I thought 3dB was double, regardless of
units.
> +3dB voltage -> +6dB power because you also got +3dB current, P=IE and
all
> that. But OTOH I'm just a hacker, what do I know? :)

When calculating power ratios the formula is 10*log(x1/x2) where x1 and
x2 are power measurements in e.g. watts. For voltage (or current) ratios
you use 20*log(x1/x2) where x1 and x2 are voltages (or currents).

If you double the voltage across a given load you will quadruple the
power dissipated since power is proportional to the square of the
voltage (p=v2/r).  Thus 6dB is a doubling of voltage but 3dB is doubling
of power.

Thus is the mighty Ohm's Law preserved.

















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