- Joined May 18, 2020
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.