![]() Otherwise depending on your input voltage you may need to find a 2A adjustable output boost/buck module (which can take an input voltage both lower or higher than the output voltage) to power this. You could (as they suggest) use a LIPO battery (3.7 to 4.2V) directly. The LM2596 is a step down regulator and thus would need 5V to produce a 4V output. Specification Supply voltage: 3.8V - 4.2V Problem number2, the GSM module wants 4V not 5V There are 2A boost modules readily available some even have Fritzing parts (the lm2596 for instance, which is recommended in the data sheet, is on core parts.) In any case here is the requested booster as it is made now. The sim800l under some circumstances can draw 2A and thus this power supply is not big enough. ![]() After I made this module, I read the sim800l manual.
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