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By Saphareas
#81756 I'm observing a strange behavior with my ESP-01. I have this programmer on which I can run the ESP successfully as it converts the USB 5V to 3.3V. I also have a USB-to-TTL cable, which outputs 5V straight from the USB port. I build a voltage devider with R1=560 Ohm and R2=2x560=1120 Ohm to convert the 5V from the TTL cable. I measure 3.3V behind this devider, but when I try to run the ESP on these 3.3V it won't power on.

Where is the difference between the 3V from the programmer and the 3V from my voltage devider?

EDIT: I am also unable to power the ESP with 3V from 2x AAA batteries.