Wall Wart Questions

[Siegfried Meier]

Do they make + and -  voltage rail Wallwarts?  Usually they just list the AC or DC voltage, but I don't think I've ever seen one?

 

[JohnRoberts]

I saw a vendor prototype of one, (a couple decades ago) but I didn't spec it in because it was too expensive. Much cheaper and more flexible to use a simple AC wall wart. That way I could use it more different ways, for different products. The +/-/0v also needed a more expensive 3 circuit power connector set, etc. etc...

JR

 

[mjrippe]

I have seen "line lump" supplies with +/- voltage, mostly computer PSUs, but not "wall wart" ones.  Like John said, it is easier to use an AC supply and then do rectification and regulation inside the unit.

 

[pucho812]

one could use  two dc wall warts together much like using 2 X single  PSU's to get bipolar voltages you know where there is a common.  But, I don't see why one would want to do something like that, space alone would be a pain.

 

[rkn80]

you don't need a +and a - voltage rail.
Use a wallwart with one + dc rail and buck/boost converters behind. Then you can generate any voltage you need for analog audio circuits from it. Check out the TI website for it.


R.