Hi all,

Got a slight supply issue question.

Ok, I have a main circuit that requires 12 Vdc - no problem.  I also have a
set of smaller circuits that require 5 Vdc, 15Vdc and -15Vdc.

The main supply in is 12 - 15Vdc (12 min, 15 max, never greater then 15).

I'm thinking some sort of switching or voltage doubler, but I don't know
enough about post-rectified/filtered DC to come up with a circuit of my own
to do this.

the 5Vdc is for my logic IC's.  The 15Vdc and -15Vdc are for an LCD screen.
The 12Vdc circuit that runs off of the main supply feed right now will need
to communicate with the IC's in the logic section (so the main 12Vdc feed
ground will need to be connected so they have a common reference).

I'm just not sure how to do this.

The power supply is an external supply over which I have no control.

I've built power supplies before, but not like this.  I have never done a
switching DC-DC converter before.

Does anyone have any good references or suggestion circuits?

-Tony

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