How can I make an easy power supply?
I want to make a really easy power supply that uses direct line voltage (120) using just a capacitor(WITHOUT a transformer). I've seen the instructable where Tool Using Animal (https://www.instructables.com/id/LED-Lightbulb/) made one for LEDS. I measured it and got around 2 volts. That was with a .47uf cap. I want to get around 12 volts but I don't know how to get it without buying 20 different caps to see which one works. Is there a formula? Thanks in advance for your help..