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DC 3.3V 3.7V 5V 6V to 12V Step-up Power Supply Boost Voltage Regulator Converter | eBay
DD0603SA_3V3 Auto Buck-Boost DC DC 0.9-6V to 3.3V Step-UP Step-Down Converter Board Power Supply Module DD0603SA_3V3 - AliExpress
Step-Down & Step-Up Converter DC-DC 1.8V-5V 3V 3.7V to 3.3V Power Module - Buy and Sell Hardware Products, DIY Electronics and Kits, HuaQiangBei Online Store - PCBWay
Amazon.co.jp: 5A DC-DC Mini DC-DC Boost Step-up Converter, 3V, 3.2V, 3.3V, 3.7V, 5V, 9V Voltage Regulator PCB Board Module Can Set 5V/8V/9V for Golf Cart Club Car : Industrial & Scientific
Pololu 3.3V Step-Up Voltage Regulator U3V16F3 | The Pi Hut
DC-DC 1.8V-5V to 3.3V Boost and depressurization module - Pixel Electric Company Limited