This is a precision ±15V regulator designed on a single side PCB. The original project is based on EB-802 and belongs to zerosoft. The author took the original project and modified it by replacing some of the components with others that are easy-er to find on the market.
The board has a really nice symmetry design and fits nicely into a case. You could use the regulator to power a pre-amp or a headphone amplifier with great results.
+/- 15V Power Supply: [Link]