You would need TWO DC supplies as they use AC so they can create both a plus and minus 15 volt power source to run the internal op amps.
Here is a schematic for the 1202 which has same power supply configuration as the 802.
http://elektrotanya.com/behringer_xenyx_1202.pdf/download.html
Scroll down to the little link "Get Manual" and download the service manual and schematic. You will find the power input in the upper left corner of page 5.
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