Hello, I'm new to electronics currently working on building a power supply. My plan is going from a simple unregulated one
and then build on it until I understand how all parts work, and so get to something like this one
1. My problem now is that I want to add digital voltage and amp meters and also I'll need a fan for the heatsink that goes with the 2n3055, but I'm not sure if I should add an independent power supply that provide power for them independent from the rest of the circuit or draw power directly from the main circuit.
2. The fan I have requires 12v while the meters need 5v which in the spirit of learning, I'm thinking of building a linear voltage regulator for them, but for what I understand they are not very efficient, any suggestion how would be better to approach this?