Both Secondaries for Positive Voltage?

[Stocker]

Given a transformer with a center tapped secondary...

Could you take both secondaries and make them give you positive voltage using 3-pin regulators? That is to say, use the "top" secondary as normal, and then use the "bottom" with the center tap as positive, and use a regulator to get a second set of +V out of it?

general idea drawing (sorry about the quality)

/edit: Probably couldn't use them for circuits that were connected at all, but for independent devices...

[dmfraser]

Yes you can but you forgot the rectifiers and filter capacitors.

[paulb]

You don't have to have separate grounds for the positive supplies. You can use two full-wave centre-tap rectifiers (two diodes each) to get two positive supplies, then run it to your two regulators.
http://sound.westhost.com/power-supplies.htm#fullwave
Or if ripple isn't a problem, you could use two half-wave rectifiers, one diode each.

[Stocker]

Originally posted by dmfraser
Yes you can but you forgot the rectifiers and filter capacitors.

those are my magic regulators with infinite PSRR.

that's why the drawing is called a general idea drawing.

I had completely forgot about the ESP page (seen it before) thanks.