[sdiy] Wallwarts and ground?

[John Blacet]

--How many wires are coming out of the wart?

If it is only two, then you just have a 9V supply. To have +/-, you would
need *three* wires and one of them is common.

> What if the wallwart is already putting out +/-9v *DC* how would I hook it
> up?  I think it would be easier to deal with the AC as I understand how to
> get DC and a relative ground from that, I'm just not sure what to do if I
> already have a supply with +/-9v DC.
>
> James R. Coplin
-- 
John Blacet