[How to do instruction] Raspberry Pi power Supply

[Malefoda]

(...) DIYAudio there will be a GB run by Tea-Bag for member Salas's new wonder, a nice linear supply. (...)
I plan to use it for my RPi & Allo DigiOne (...).
https://www.diyaudio.com/forums/power-su...apter.html

I've pulled the trigger for the L-Adapter. Easy to build, high current peaks, fine voltage adjustment, relative low power wasted in heat. (here with a Pi)
And if you supply your Pi via the GPIO header (hence bypassing the Pi supply protection): "Turn on time to 5V output: 200mSec, Turn on voltage peaking: None". Quite safe.

If one want other alternatives, to be fair with other gifted designers out there, have a look at:
DIY options:
Glassware LV Regulator 5V/2A, if no accessories on your Pi and just maybe a DAC hat should be enough current,
better:
AMB Labs σ11 adjustable and top specs, maybe more work and adjustments required,
if money is no object, a jewel:
Teddy Pardo Teddy5/3