ESP8266 Community Forum

- Mon Jun 05, 2017 3:42 pm #66767

no, not realy.
looking at the datasheet of some diodes you will see that the voltage drop depends on the drawn current. Less current, less drop.
there is good reason why low dropout, low power regulators are manufactured and sold ...

i only have ams1117, this need +1.5v to drop to X voltage, i need 3.3, battery has nominal 3.7, doesn't work!

i need the most simple and chep way, without buyed_circuits or any simillar. I supply my esp01 with 5v normally (more then 2 months!), but nodemcu i never try.

- Mon Jun 05, 2017 5:42 pm #66772 You need an ultra low dropout regulator. I've used LP2981 3.3 for NRF24L01 based project. Power supply was a 3.7V battery just like yours and it worked.

Current output of LP2981 is very low; 100mA and ESP8266 needs 80mA on average, according to datasheet. It may not work. You can look for different ultra low dropout regulators.

- Tue Jun 06, 2017 2:41 am #66789 If he likes to gamble - like with his esp-01 - he can supply nodemcu via 3.3V pin from LiIon.
I don't know about the reverse capability of the on board regulator, he will find out sooner than later.