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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\$\begingroup\$ What does NodeMCU documentation say about VIN pin? \$\endgroup\$– JustmeOct 14, 2022 at 10:30
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\$\begingroup\$ You should add some links to the datasheets. I cannot find a NodeMCU LUA Lolin V3 with an ESP8366. Maybe a typo? \$\endgroup\$– VelvetOct 14, 2022 at 10:56
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\$\begingroup\$ Errata - should read ESP8266-12E. \$\endgroup\$– tlfong01Oct 14, 2022 at 11:25
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\$\begingroup\$ @Seir: It was a typo. I meant ESP8266. \$\endgroup\$– abdusalam7474Oct 14, 2022 at 11:58
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According to the "Schematics", VIN (5V .. 9V) is tied to the AMS1117 3.3V. Therefore you're safe to use a L7806CV to provide regulated 6V input voltage.
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.