As a learning project, I'm trying to create a simple linear power supply using LM317. The basic circuit is well documented on internet, but I want to create a variant that allows me to have multiple output channels.
One of these output channels is for internals of the power supply: powering up an INA219 to measure current drawn, an atmega328 and an LCD for display.
Ideally I want to have two independant variable output channels (1.25V - 12V) and a single internal output channel (5V).
I think the following circuit should work, on paper, but I am not sure it will be really usable in practice. I have the feeling that sharing the same input lines (and grounds) between all channels will create undesirable side effects between them, especially with ICs using spike currents like the LCD.
The top part is the variable output channel, the bottom part is the internal 5V channel. They are both forked from the 15V input from a switching wall adapter.