Is it a good idea to use a Zener before a voltage regulator to drop Mains voltage, say 120v to 12v and then regulate to 3.3v? - Quora
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What are the disadvantages of using a Zener diode over a linear voltage regulator? - Electrical Engineering Stack Exchange
![Why does voltage drop in a simple zener diode based voltage regulator? - Electrical Engineering Stack Exchange Why does voltage drop in a simple zener diode based voltage regulator? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/q6AHI.png)
Why does voltage drop in a simple zener diode based voltage regulator? - Electrical Engineering Stack Exchange
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