Powersupply? +9v, +15v -9v simultaneously?

[Jaicen_solo]

Ok, i'm still building my Hendrix in a box, and it's now time for the dreaded PSU phase.

I'm powering a Univibe, Octavia and Two Fuzz Faces, hopefully from a single supply.
I also want to have a + and -9v available for NPN and PNP FF's at the same time.
I was thinking that I could rectify the 15-0-15 AC to 20-odd volts and use three seperate regulators, but is there a better way?

[R.G.]

"Better" implies some way to judge the differences. Simpler? Cheaper? Smaller? Lighter weight? Sturdier? Uses mostly parts you already have?

I think that making +/- 20 and then using three terminal regulators is certainly a very straightforward way.

[Jaicen_solo]

By better, I mean performance wise.
As you may be aware, given that you've helped me most of the way R.G, this is my 'big' project that i've been planning since day one in this hobby.
I'm building a custom chassis to house all the parts including the PSU, which will be well shielded including shielded wiring all round.

The main thing that was worrying me was that I would be using the same supply for + and for -ve ground pedals, and i'm not sure why that should be a problem if each supply is regulated seperately.
Also, if I rectify one side of the transformer 15-0, that would give me ~20VAC, so a 9v regulator is going to eat something like 11v as waste, so that might get a bit hot. Should I look for a second smaller transformer and make a +9v - 0 - -9v supply with that?

[Processaurus]

you can cascade regulators, and run the +9 off of the regulated +15 supply.

[Jaicen_solo]

Yes, that had occured to me, because the FF isn't going to load the current too much, however that still leaves me with a -9v problem.

[smallbearelec]

These transformers:

http://www.smallbearelec.com/Detail.bok?no=1012

are cheap, reliable and very satisfactory for +/- 9v jobs. I have built several bench "bricks" around them

http://www.smallbearelec.com/Projects/SmWart/SmWart.htm

and we use them constantly in our shop. Where you need more current, this transformer is good:

http://www.smallbearelec.com/Detail.bok?no=339

[Jaicen_solo]

Thanks Steve, i'm in the UK so I usually source transformers locally to save on postage costs.
I already have my 15-0-15 transformer which i've wired to the Neovibe, and I was hoping that would suffice for the whole box.