I need a power supply for a PCB that requires 3.3 V and 5.0 V for the MCU, LEDs and other peripherals but also requires about 10 V (positive and negative) for an audio circuit. My original idea was to bring in 20-24 V from a wall adapter and use a virtual ground circuit for the audio requirements. Reading into this, most virtual ground solutions can't handle much current and the PCB's collective power (worst case scenario ~26 Watts) must return via the virtual ground. Also, it seems that a lot of virtual ground solutions must have balanced power being drawn from the two rails to prevent the virtual ground from drifting. I looked into using multiple linear voltage regulators, but anything outputting negative voltage must also input negative voltage and Digikey does not list any wall adapters with negative voltage outputs.
Any ideas?
Any ideas?