Consolidation of Multiple Power Supplies to Single One

[The13thParish]

Dear all,

I'm working on a project which requires 18 V, 6-12 V (the exact voltage in this range doesn't matter) and 5 V for a microcontroller. For prototyping purposes, I've been using separate supplies but this is just lazy and looks a mess. I understand that shifting 3.3 V to 5 V (and vice versa) is easy using a level shifter, although is this technique more general and hence applicable to my problem?

I could use a multi-branched voltage divider however I've never quite understood what the effect of the high-frequency microcontroller switching would be on the other branches of the divider and all the filtration that I would need to make that work.


All the best,
Ryan