AC to DC split supply rectification/filtering info ?

[petemoore]

  Recent edit:
  I've decided to simplify the question about how to do up a power supply, but any information like schematics showing the actual power supply with the CT transformer putting out +/-AC, rectified for use as DC input for a SS amp, please help me find the reading material on that.
  Here's the question..
  I have a transformer providing +/- 14VAC from the secondary tap.
  I would like that to be +/-18VDC, ground in the middle, for the GGG LM3886 amp.
  Is there something I can look at which will show the topology of what is needed between my transformers split AC output and the DC supply for the LM3886 amp supply, +/-18VDC from +/-14VDC...I think I can work with just the topology and get it from there.
  in all the wrong places I guess.
  Ahh...maybe here's one
   http://www.geocities.com/TimesSquare/1965/se_sv811.htmlI need to
  The bottome part of bobs PS schematic on this page where 120VAC mains into primary/180V CT on the secondary, and shows the diode configuration which equates the secondary output to +/-130VDC, and also shows filtering caps.
  Looking for more info to provide...BRB....see top.
  I wouldn't ask before typing everything I could think of into google, studying data sheets, I'll go see Zen again, it's probably in one of those pages.
  Here's one by John Linsey Hood, the bottom right corner looks pretty good ?

[R.G.]

You have some reason why you don't like the second illustration in

http://geofex.com/Article_Folders/Power-supplies/powersup.htm

?



In fact, give the whole thing a read, then come back and ask the fine points.

[petemoore]

  I'll take care of my calculator, you can count on it !
  ...I only read a little so far...there's the page I need !
  

[petemoore]

  Great pages !!
  Thanks RG...how many times 'till I learn..lol.
  +19.3 /"0"/ -19.3
  DCV's is what I've measured.
  I started kind of noticing there really isn't that much difference between single and split supply diode bridges [none], which is what the board I salvaged to use has on it...single or split supply...the difference in wiring was exactly...move 1 wire, add 1 wire....very easy with the plug in wire connectors.
  So it's alot like I thinking is was going to turn out to be:
  I walked right by the page on PS's, and I was already 90% 'there', just a very minor task to convert from single supply to 'X-0-X' voltage split supply.

[R.G.]

Woo hoo! You bad, baby.

Go!

[petemoore]

  Bad but gettin' better.
  That read was quite the welcome, greatly satisfying, and seemed much lighter this time, I don't know why, looks like the article is exactly the same as last time I read it, sometime ago. Very clear now, very well written article.
   Works perfect too. Now I know why !
    From the group and myself, for the wealth of excellent reading material written and offered...even linked to, thank you RG !
 

[alextheian-alex]

That power supply configuration is also known as "dual complementary" sometimes.  If you need more info, just do a search on Google for that.

[petemoore]

  Thanks Alex ! Will check that out.

[R.G.]

It's called dual complementary because each half - positive or negative - is actually a full-wave-centertapped power supply all by itself.

If you draw the schematic, then erase the two diodes in the negative side of the bridge, what you have left is the positive-side full wave rectified supply. Works fine that way, and that's what's in most tube amps where there is a tube rectifier.

If you erase the positive-half diodes instead of the negative half, you get the inverse, a negative-going full wave rectified supply. This is the inverse of the usual centertapped supply on tube amps.

Put them both together by using all four diodes and you get a bipolar supply.

[petemoore]

http://www.mcitransformer.com/i_notes.html
 The ripple can be reduced by changing the filter capacitor to an ic(inductor-capacitor) filter but the cost to make this change would make use of the regulated linear power supply a more economical choice...they're taking about a diode bridge filter cap alternative.
 '2.' looks to be something to try..'if and if'...are explained.
 '3.' ...heavy and ~'noise'
 '4.' ...specially designed transformerS...daghh, I ever happen to notice I happen to have all that layin' around meaybe...lol...or have need for a very nice high end PS.

 "Dual Complimentary shown there is what I have going on now, the amp chip hopefully tomorrow...and initial application testing soon after.
  Huge tranny has two 1''x1''x6'' boards connected to look like a 'forklift fork' from the 'framing ring' [kinda like a pickup mount ring] that comes with these trannys [a feature of these salvaged Onkyo power tranny's!], The PS board [probably also came from the Onkyo..] mounts across the forklift' boards, the heat sink 'a big huge 'L' shaped item, [which also will be shielded..] is on the other side of the mounting 'forks'..works out good, the tranny is heavy enough so the resting point is its side...[total size is 10.5'' x 10.5'' x4.5'']should be good!...me hopes high !![epectations, low of course, 'till I see what it actually does].