[sdiy] Best way to get a +3.3V rail from +15V?

Oscar Salas osalas at electronic-sea.net
Thu Mar 7 14:36:29 CET 2013

How much current do you need?

> Hi all,
> I'm putting a little dsPIC prototype dev board together for mucking about
> on. I've done such things before, but I've always had a +5V supply
> available, so when I've needed a 3.3V rail for the dsPIC, I've stuck a
> regulator on the 5V supply. Which was fine, but that's not the situation
> this time.
> If I've only got +/-15V available, what's the best way to derive a 3.3V
> rail?
> I've used 3.3V regulators on the 15V rail before and found they got hot,
> which wasn't a surprise seeing how much voltage they've got to lose
> somewhere. But perhaps I was doing something wrong?
> Thanks,
> Tom
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