avr_fred:
Please do. I have a 20 volt 16 amp transformer I've had laying about that I've wanted to build into a decent analog supply for awhile. I've just been too lazy to design something. Have a bunch of old hermetic packaged '723s that I had considered for the core but never got around to it...
Sure... here it is (outputs 13.9VDC):
(click pic for full size)
Sorry it's a kinda crummy quality image, but I used an image editor to draw it....