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esp8266 - 3.7v to 3.3v voltage regulator - Electrical Engineering Stack Exchange
snapVCC 3.3/5 V regulator snaps onto 9V battery from Electronut Labs on Tindie
Amazon.com: ALAMSCN 3.3V 5V MB102 Solderless Breadboard Power Supply Module with 9V Battery Clip Power Cable 2.1x 5.5mm Male DC Jack Plug for Arduino (Pack of 3) : Electronics
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Variable Voltage Battery 3.3v - 4.8v w/ Charger — Extracts Academy