- Nov 6, 2002
I thought the regulators would be necessary because of variation in voltage vs. load. Why wouldn't that apply here?
Recent DC-DC converters have pretty good load regulation. And since you're using opamps with extremely good rail rejection at audio frequencies (where the PS will be modulated, higher frequencies will be dealt with by bypass caps), you should be fine. I wouldn't do it for a discrete design of course.
But one should take note of the switching frequency of the chosen converter and design an LC accordingly.