Re: LCD refresh rates - don't understand

In article <313030303737303648B5FDEA02@xxxxxxxxxxxxxxxx>, Johnny B Good
wrote:
I'm not decrying the use of a "Rock Solid" power supply, hell. I've
designed my 50w per channel mini stereo PA amp with a 35v regulated PSU
(just below the max voltage rating of the op-amp chips used in that
design :-). I'm just pointing out that there is no advantage to the
manufacturers of consumer grade Hi-Fi amps to add the extra complexity.

They can 'legitimately' claim significantly higher headline "Total
PMPO" figures for their product when they forego such a nicety and use
devices that can handle the higher transient voltages involved. Provided
the "smoothing caps" are selected to handle the lowest audio frequency
rather than for 100Hz ripple suppression, this can be a quite effective
tactic.

I'm sure it is, but the difference in running an amplifier from a 35V
regulated power supply and running it from the slightly higher voltage of
the unregulated source that would have fed the regulator if you'd used one
can only be a dB or two.

So I'll grant you it's a real improvement and it enables you to make quite
legitimate claims, but I think the increase in the numbers in the spec
sheet must be more impressive than any audible increase in loudness.

Of course we shouldn't underestimate the importance of those numbers if
you're designing those amplifiers to sell them....

Rod.
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