It's already fed with DC, not AC - you simply need a split supply with positive and negative voltages centred around a zero volts ground/chassis connection - there's no AC on that schematic at all.Supply is a DC15V . But is it correct to feed everything with DC not AC?
Thanks a lot for explaining. I dont understand everything but Im trying to.How is it that you are interacting with this board but do not have the correct power source? If the board already is in something, how is it powered?
You can try to use an isolated DC/DC Converter.I need to learn how to do the dual rail/split thing with positive and negative from a DC source that you explained about earlier.