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Covert 12v dc to 15v and 3v?

hi guys, I need to convert to 15vdc and 3vdc from a 12vdc source... any ideas? Efficiency isn't the biggest concern, but size and simplicity really come into play. i promise credit if it becomes an instructable.

gschoppe (author) 8 years ago
that seems like a good balance between simplicity and efficiency, thanks.
gschoppe (author) 8 years ago
sorry, quick edit... i only need to drop 15v to 3v... I'm considering just a dropping resistor, as I am unfamiliar with the more efficient methods... if anyone has a better idea, please post.
you can try a 7805 and a resistor mehbe.