Hi all,

I've got 3V3 / 5V micros and an audio board

For a particular reason I'm using a 12V AC wall wart. Regulating
down to 3V3 and 5V is not a problem, but I want to keep as
much of the voltage from the AC as I can, at least over 12VDC.

The audio section seems particularly sensitive to hum. I've tried
adding more and more reservoir caps, up to 10,000uF, but the
hum is still quite noticeable

With the original 1000uF I started with, as the circuit draws only
250mA, there's about 2Vp-p of 50Hz ripple on ~ 14VDC

If I take a switching IC, something like an MC34063, and use
the rough DC as the input do you think the IC will chop it up
enough and re-assemble it to remove the ripple completely ?

Intuitively I think it will, and would try it if I wasn't a little pressed
for time, rather than asking

TIA

Joe


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