Switchers
Sneakers
Switchers
Swatches
These things are everywhere. Sometimes called (the unfortunate name of) wall warts.
Calculators
TI's LM63460
Some manufacturers will have calculators in addition to the app notes that you can use. These are often based on excel/spreadsheet software. Reference: https://www.eevblog.com/forum/projects/buck-loop-stability-tuning/msg5453216/?topicseen#msg5453216
Tips/Techniques
Stock 5V and 12V
These are the most common voltages. Always try to standardize on the most common barrel plug (which is I think 2.1 or 2.5mm, and 5mm or thereabouts).
Diodes Gone Wild
He has a number of videos that diagnose broken switching power supplies and is reasonably knowledgeable about them.
Example of 5V 8-pin DIP Regulator
https://www.eevblog.com/forum/repair/need-help-to-identify-a-blown-chip-in-skynet-for-z12c-switching-power-supply/msg5445107/ It's always easy to spot the capacitor and diode.
