Linus Torvalds 4ea2fbfbc9 Update 1590B board for sanity
I had entirely forgotten the activity LED, which was really annoying
when testing.

Also, while the transistor follower / capacitor multiplier on the analog
power supply was interesting for some low frequency power supply ripple
removal in simulation, it doesn't actually make any sense with any
modern power supply, so just do a regular RC filter for high
frequencies, which is what actually matters.

Together with the fixed potentiometer board, I think this should now
work nicely.

Famous last words.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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