On Mar 4, 5:39 pm, "James Littlejohn" <nargut...@yahoo.com> wrote: > You would not hapen to have a schematic for a dc-dc converter for the > -5v, would you? Dallas/Maxim makes a number of DC/DC converter chips. Have a look at: http://para.maxim-ic.com/cache/en/results/4636.html