Hi everyone I have to design a power supply for my assignment but i struggle to find a right equation for smoothing capacitor... There are a few different equation i have found but they all giving me different result. The most common equation i came across is C=I/f*V and f is equal 100 Hz. But the one i have used is from a book. I have attached a pictures from the book. What i can't understand is why in they calculations the frequency timed by 2. Its already a 100 (supply frequency by 2)??? Thanks.