I had a lot of trouble with some of Uncle Clive Sinclairs monolithic power
amps that operated in a bridge config, so the speaker was not really
earthed at either end. Worked great until one of power op amps, for in
effect that was what they were, popped its clogs and cooked the speakers and
firied the other chip.



Those circuits used to pop up in car output stages as I recall.
Brian

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"Theo" wrote in message
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"Dave Plowman (News)" wrote:
I can see that. Just odd I've never seen it used before.

FWIW it's not wrong to use separate capacitors V+ to 0 and 0 to V-, but
effectively what you have there is half the capacitance from V+ to V- and
double the ESR, so you're adding components to make it worse. It might
make
sense where there are single-rail loads running between V+ and 0 - for
example digital logic, which are more the kind of thing decoupling
capacitance is intended for (high frequency switching loads rather than
general audio ripple).

Theo