A must have in any electronics toolbox is a 3.3V voltage regulator. So here is one that i built today with the help of Maxim’s MAX604:

The circuit is really simple too (both capacitors I used are 10uF) :

Here is the datasheet for MAX604.

If you know Romanian here is the translated article: https://www.descurcareste.ro/tehnologie/stabilizator-de-tensiune-de-33v-500ma-cu-max604-192