Andrew K Lindsey wrote:
> So - anyone have any ideas on how to scale a 0-90V source to 0-3.42V
> at about a third of an amp current, efficiently and compactly, and
> without requiring a seperate power supply?

Sounds like a good job for a buck switcher.  Instead of regulating down to a
fixed low voltage, have the switcher directly regulate the current thru the
LED.


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