I have a NodeMCU LUA Lolin V3 with an ESP8266 -12E.
I want to know if I can use an L7806CV votage regulator with it through the VIN pin?
The NodeMCU has an AMS1117 3.3 voltage regulator.
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You have to supply the L7806CV with at least 8V and up to 35V. But for thermal reasons, and depending on the input voltage and current drawn, a power switcher might be the better choice.