Power Supply for 3 different stompboxes

[yeeshkul]

I am gonna house these workalikes in one pedal board:

Rangemaster: 9v, positive ground
Fuzz Face: 9V, positive ground
TS808: 9v, Negative ground
Univibe: 20/15v, negative ground

I guess i need a custom power supply for this project.
Guys do i need one transformer and split the voltages with 2 different 78xx or do i need 2 transformers, one 78xx each?
(2x 9v positive ground, 1x 9v negative ground and 1x 20v negative ground coming out of it).

[petemoore]

Rangemaster: 9v, positive ground
Fuzz Face: 9V, positive ground
  + must be separate from - [to prevent PS shorting]
  consider a MAX1044 to get an inverted supply for them.
TS808: 9v, Negative ground
  9V supply for pos. gnd. and MAX1044 used as inverter would do the above effects
Univibe: 20/15v, negative ground
  For this one...I would say start with a different transformer, then use an LM317 regulator to get the 15v going.
  There are other possibilities...
  Spyder with special outputs for the Univibe supplies.
  A bunch of WW's...easy wire and cheep if you got 'em like that, but might have more ripple on the DC outputs.
  Use an ~11vdc output, put 1x MAX1044 in for -gnd. inversion,
  You might want lower voltage supply for the -gnd. effects [add an LM317].
  Another MAX chip wired as voltage doubler could be used to '2x' the 11v to = ~20v for the 'HV' univibe supply, then into an LM317 to drop that down for use as the 15v supply.
  I'd look for the 20v UNI supply in a transformer...perhaps there is something available which could be rectified and filtered for 20v then regulated for the 15v...see how that approach looks as far as availabill, pricing.
  @@Rate working with some WW means possible inadequate filtering to reduce DC ripple, LM317's seem to help with that though, and require about 2volts to operate [ie for 9v output you'll need at least 11v input].
  Starting with a transformer or transformers is a pretty good approach.
  A small handful of voltage regulators like LM317, and some MAX1044's [which can invert polarity of 9v, or, almost double voltage of DC input], you can get what you want,
  many options gets confusing...at least there's some suggestions..

[yeeshkul]

peter thanks! i'll think about that and put something on paper and then here.

[yeeshkul]

I am thinking about a right transformer. R.G. mentioned that torroid transformers are quiet (in the Univibe thread). What can be the totall DC current i need here for the mentioned 4 circuits?