I wanted to start working with my ESP8266 and needed a 3.3V regulator to get enough current. I had ordered some 1117 regulators, but went looking through what I had laying about, and "created" this simple circuit.
It is not very efficient, and would benefit from a Darlington in place of Q1, but it gets the job done with enough current for the ESP8266. If the output voltage is just a tad to large, try replacing D1 with a Schottky type.
Adding a 10uF capacitor from 5V to ground is a good idea.
Generated on 2018-05-03 01:14:21.915777