I just published two new lessons in the course How To Design A Power Supply:
Since messing with the high voltage in the wall plug can be dangerous, I’ve added a section on how to do it safely too.
So far, I’ve gone through the basic design of a 5V power supply.
Next up, I’ll look into how to use this to charge modern smart phones.
Keep On Soldering!
PS! I’ve just upgraded ohmify.com from http to https for higher security on the site. Let me know if you find any pages that don’t work or that give errors.