Bi-Polar power supply +/- 12V. Need advice

[Vallhagen]

Hi Forum. I guess its correct to ask a question like this under "General". If not, admin, feel free to move it.

The project im soldering on at the moment needs +/- 12VDC. And... i just cant find a wallwart with such outputs (sometimes i AM an internet illiterate, but yea, i cant find them)...

So... question #1 should be: If the product (a +/-12VDC Power Supply) even exists, can someone point it out as a link? Preferably on mouser.com, as i guess i will put my next order to them.

Question #2: I maybe have to build it myself. I have found schematics
on generalguitargadgets (http://www.generalguitargadgets.com/pdf/ggg_bipolar_ps.pdf),
and MFOS (http://www.musicfromouterspace.com/index.php?MAINTAB=SYNTHDIY&PROJARG=WALLWARTSUPPLY/WALLWARTSUPPLY.php&VPW=1150&VPH=588)
... and i wont rush for the PCB-s, but can build it up on a piece of perf board. The MFOS design is more complex (among other things it includes a load), so i guess thats the one to go for. Or? Advice?

... and i need to input 12VAC into that circuit. Here i need advice about which transformer to choose. Mouser link, anyone? We have 230VAC in our walls here in sweden. If i not include the transformer to the design, i guess i can go for a 230VAC-12VAC wallwart. That would be the easy/safe way too, as i dont have to deal with 230Volts in that case. On the other hand im not too afraid of that, ive been there before.

So... how would you guys solve it?

Cheers
Bengt

[TNblueshawk]

I recently went through an exercie in futility if you will trying to find a 12v 500ma center negative PS. I needed it regulated and NON switchable.

What I ended up getting through a Google search was a 12v center POS, 500ma regulated but it was switchable. I cut the cord, flipped the wires and made it NEG and it works fine.

Then after I posted my build pickdropper came on and pointed me to Jameco



http://www.buildyourownclone.com/board/viewtopic.php?f=8&t=36771&p=312955&hilit=murder+one#p312955

[Vallhagen]

I recently went through an exercie in futility if you will trying to find a 12v 500ma center negative PS. I needed it regulated and NON switchable.

What I ended up getting through a Google search was a 12v center POS, 500ma regulated but it was switchable. I cut the cord, flipped the wires and made it NEG and it works fine.

Then after I posted my build pickdropper came on and pointed me to Jameco



http://www.buildyourownclone.com/board/viewtopic.php?f=8&t=36771&p=312955&hilit=murder+one#p312955

Thanx for reply. Im not sure that helped me though; or if i put up my question a bit unclear.

I need
+12VDC and
Ground and
-12DC

...from preferably the same power supply.
Cheers

[TNblueshawk]

My bad. I need to slow down and actually read

But, Jameco seems to have a good selection of PS so I'm thinking I would scour their website.

[Vallhagen]

My bad. I need to slow down and actually read

But, Jameco seems to have a good selection of PS so I'm thinking I would scour their website.

All cool:)

...and thanx for the link to jameco. Something like this would suite me well:
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_20626_-1#

...ill see if i can find something similar closer to sweden (non-overtheseashipping). Or i just build something like it on some perf board. I still dont find any ready-to-go-product though, so im pretty convinced by now that i have to build it myself. Kit or not.

Cheers
/Bengt

[DutchMF]

Check out the "Notes" section of the Boneyard docs, there's some info ther on getting + and - 12V from just a +12V supply. It's basically a modified Road Rage. Read it carefully, because you will have to use the correct parts to not fry the IC's!!

Paul

[badgerific]

This is pretty big but if you can't find another way it'd be useful: http://www.musicfromouterspace.com/index.php?MAINTAB=SYNTHDIY&VPW=1910&VPH=740

[Vallhagen]

Thanx Dutch, i read through the boneyard documentation. Definately an alternative to solve it that way.

Badgerific: I guess you meant to link to the MFOS DIY power supply, but happened to link to the SubCommander? Coincidentally, its the SubCommander i am building:)

Cheers

[badgerific]

When I click the link it goes to the power supply :S But yeah that's what I was trying to link to

[Vallhagen]

When I click the link it goes to the power supply :S But yeah that's what I was trying to link to

Funny... when i click it right now - again - it takes me to the right place too...

***

Anyway, i have decided to what to order; i found it at a semi-local (swedish) dealer; trafo, regulators and stuff. Pretty much similar to the MFOS thingy, and about the same pricing.

Thanx for replying, folks:)

/Bengt