Re: audio amplifiers: +/- X VDC vs 0-X VDC

On Sep 25, 11:33 am, mrdarr...@xxxxxxxxx wrote:
I've noticed some audio amplifiers, like this one, need +/-
35VDC:http://www.national.com/mpf/LM/LM3886.html

and some amplifiers are happy with 9 to 18VDC, with respect to
ground:http://focus.ti.com/lit/ds/symlink/tpa1517.pdf

Besides the obvious difference in power, how come one needs +/-
power,
and the other is happy with 0-X power?

In the second case, for "no audio signal", is the speaker suspended
halfway between rest and max, resulting in only half of the
available
speaker movement range?

Michael

Split supplies don't require an output capacitor on the amplifier.
Those can get big and expensive for high power levels.

GG

.

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