[sdiy] Battery power for eurorack

[Mattias Rickardsson]

Mike Bryant <mbryant at futurehorizons.com>:

> I don’t know why people think switchers have to be noisy.  To me there’s
nothing worse than 50/100Hz still leaking through umpteen thousand
microfarads of smoothing.    Apply that much smoothing to a >50kHz switcher
and the noise would be below the cosmic background noise level.

Low audible noise, but perhaps that's not the only aspect. The RF energy
from switchers is often clearly visible on a scope, in repetitive spikes at
frequencies and amplitudes that vary a bit with temperature and current
draw.
What happens when these spikes are added to a comparator threshold level in
a VCO core designed with only linear power supplies in mind? :-)

/mr
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