HELP-Transformer for diy pedalboard P.Supply

[Bullet79]

what kinda transformer (230v) i should use to build a pedal board power supply..
i'm having trouble buying the tranny coz i dunno what kind/type & spec to choose... kindly anyone please help me..??

here's where i usually shop for parts...
http://malaysia.rs-online.com/web/search/searchBrowseAction.html?method=browseSuperSection&Ne=4294960157+4294964839&N=4294862356

[petemoore]

  There's lotsa ways to power a pedalboard.
  It depends on what the pedalboard and the owner choose though.
  Spyder is worth a look, GEO.
  Typical wall wart power, regulated ain't bad.
  Pick your supply voltage, find a WW which is at least 2v above that when loaded, say you want a 9v output...start with 12v WW>regulate to 9v [7809 regulator], filter, excellent supply.
  It's safe, but watch the polarity.
 
 

[head_spaz]

It's not absolutely mandatory, but it's a better practice to use a isolated power for each individual stompbox to prevent "ground loop" conditions that cause hum and noise. That way signal ground can be daisy-chained thru the signal cables alone, rather than the via the power jacks AND the signal cables together.

A standard power transformer is not going to give you that option, because it doesn't have enough isolated secondary windings.
You could build an isolated supply using several individual transformers, such as the Spider Project uses, but that's not much different than using individual walwarts.
A better solution would be to use something like Ted Weber's WPDLXFMR-2, because it incoporates a single primary winding that supports nine individual secondary windings : 8 x 11V @ 300mA windings, and 1 x 9V @ 2 amp winding.
It also accomodates 120-220-240 VAC inputs.
You can find it near the bottom of this page at Weber's site.
Small Bear sells a similar product, but it doesn't appear to support 220VAC.

Good luck with your project.

[Bullet79]

how about these...?? will it work?



input v: 230vac
out :  2x12vac   
out current : 0.25A

[JKowalski]

how about these...?? will it work?



input v: 230vac
out :  2x12vac   
out current : 0.25A

Yeah... those would work.... Are the 12VAC windings connected together or separate? Cause if they are separate, you could have two isolated outputs.

Make sure 250mA is all you would need. Digital pedals are killers in terms of power usage, some go up to amps!  How many pedals do you want to power of of this transformer?

[Bullet79]

Yeah... those would work.... Are the 12VAC windings connected together or separate? Cause if they are separate, you could have two isolated outputs.

Make sure 250mA is all you would need. Digital pedals are killers in terms of power usage, some go up to amps!  icon_eek How many pedals do you want to power of of this transformer?

the 12VAC are separate... if its ok i'm gonna build 2 units (1 for gain stuff and the other for color stuff)
should i look for bigger than 250mA..??

[G. Hoffman]

Yeah... those would work.... Are the 12VAC windings connected together or separate? Cause if they are separate, you could have two isolated outputs.

Make sure 250mA is all you would need. Digital pedals are killers in terms of power usage, some go up to amps!  icon_eek How many pedals do you want to power of of this transformer?

the 12VAC are separate... if its ok i'm gonna build 2 units (1 for gain stuff and the other for color stuff)
should i look for bigger than 250mA..??

It depends on how much current your pedals draw.  You need to add up the total draw of all your pedals, and then plan accordingly.  Commercial isolated power supplies (such as the Voodoo Labs Pedal Power 2, though there are a couple others) tend to have a 200mA output.  Most pedals are not drawing nearly that much power, though.  If you are using commercial pedals, they should say right by the power jack how much current they draw.  If they are DIY, you'll have to figure it out.

Personally, I would want to have more current available, but then I have a Pedal Power 2+ that mostly just drives my delay pedal, and some indicator lights for my amp switching.


Gabriel