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By abat
#10847 I have very small space inside some device for adding ESP-01. Since only AC 100V is available there, i will obviously need 3.3V power suply of some sort. Does anyone have smart ideas about the schematics of the simplest possible 3.3V power supply with minimal number of components with just enough wattage to power ESP? I hugely appreciate your brainstorming on the subject!
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By MK1888
#10883 Some consumer AC-powered devices have microcontrollers with unorthodox methods of supplying power (without a transformer).

The guys at electro-tech-online.com should be able to tell you exactly what it is.