simplest voltage regulator

For projects where you use a microcontroller for example which works at 5V, if you want to interface a 3.3V module (accelerometer, sd card, bluetooth adapter, etc.), you need to somehow convert 5V to 3.3V. There are many cheap voltage regulators on the market, but if you rapidly need one, you can use this simple circuit instead, which will do the job pretty well.

With the given values, the output voltage is about 3.04V for 100 Ohm load, 2.95V for 33 Ohm load, and 3.14V for 2 KOhm load. You can ajust the output voltage by modifying the R1 and R2 vlaues.