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This mixer is designed around the use of a bipolar power supply, and so here's the one I'm using. It makes use of a MAX1044 which acts as a charge pump (using C1) to supply negative voltage. Notice that pin 1 is connected to +9V. Because the MAX1044 (and similar devices) operate in cycles, they produce a hum at whatever frequency they cycle. The MAX1044 supplies the option to move the frequency of the cycles up out of audio range. With pin 1 not connected, there is something of a whine in the upper frequency spectrum. Ensure that whatever method you use for supplying negative power does not operate in audio frequencies.