I'm trying to figure out if my power distribution setup is hurting my circuitry.
Below is a picture of the setup for one device:
The power supply is a wall adapter rated for 6VDC/900mA output.
The middle item is a special power hub I created from two pins of each USB plug and it is powered from the wall adapter through an LM2940 regulator with the 10uF cap on the input and the 22uF cap on the output.
I then connect various USB to C+ plugs to power other circuits off the same hub (hence the right-most box in the diagram). Power to those circuits is passed through its own LM2940 regulator as well.
Some circuits contain a max232 chip for interfacing the circuit with a PC but when I test the circuits in my setup, my baud rate must be very limited, and I'm thinking with two LM2940 regulators in series, I'm not getting enough voltage or current to the max232 and I feel my only way(s) out could be to ditch the hub and power each circuit from its own wall wart or use a wall wart that can deliver higher current.