bipolar supply from a wallwart?

[littlewing]

hi all,

i'm trying to avoid having to use two 9v batteries to power my soundlab. will a 9v wallwart output a bipolar supply? if not, i assume there's some way to create a bipolar supply from it - perhaps with a voltage regulator?


thanks
vito

p.s. will the SL run off 4.5v?

[expanoncolin]

hi all,

i'm trying to avoid having to use two 9v batteries to power my soundlab. will a 9v wallwart output a bipolar supply? if not, i assume there's some way to create a bipolar supply from it - perhaps with a voltage regulator?

thanks
vito

http://geofex.com/circuits/+9_to_-9.htm

-Colin

[littlewing]

thanks for that ridiculously fast response colin. i saw a post about the MAX1044 on this same board, but is that the only method or is there a more discrete way to do it with more common components like opamps and caps?

i also edited the post right after you posted, wondering if the soundlab will run off ±4.5v

[expanoncolin]

thanks for that ridiculously fast response colin. i saw a post about the MAX1044 on this same board, but is that the only method or is there a more discrete way to do it with more common components like opamps and caps?

i also edited the post right after you posted, wondering if the soundlab will run off ±4.5v

I'm prety sure the soundlab won't work on +/-4.5V.  There is a tiny chance you could use something from here (the 555 circuit)
http://www.experimentalistsanonymous.co ... 0Ideas.gif

But the 1044 is by far your best bet.

-Colin