I know there is a similar question but it did not solve my doubts, I will be clear and concise.
I recently bought the SIM800L module and then I started to try it, at the beginning it restarted itself and I realized it was due to voltage problems. After this I decided to make my own voltage regulator, using an LM317T and some other components. This worked well and placed the voltage in 4v, this way the module stopped re-starting if it was not used with a SIM but if you put one the voltage went up and down and the module was reset logically since its voltage parameters were exceeded. My question is what can I do to have a stable voltage? And if this will be my problem?
Thanks in advance!
P.D: The battery provides the required amperage, that is if the regulator can not affect it.