Re: 7815 Regulators. Voltage margin?

Posted by strewel_peterson on Jul 20, 2020; 12:52pm
URL: http://guitar-fx-layouts.238.s1.nabble.com/7815-Regulators-Voltage-margin-tp48987p49000.html

The maths-y bits come from assuming the AC voltage is a pure sine wave (which for mains and mains-derived electricity -eg from a transformer psu* - is more-or-less true). The difference between average value and peak value for a sine wave is about 1.41.

* all bets are off as to what waveform you'll get out of a switched mode psu.

The link below probably explains things way better than I'm managing to! I'm in danger of giving you my grossly simplified, and probably not really correct explanations otherwise.

https://electronics.stackexchange.com/questions/175474/why-do-rectified-voltage-boosts-after-adding-a-capacitor