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TPS62827 3.3V Buck Converter Breakout - 3.3V Output 2 Amp Max : ID 4920 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: 5pcs High Efficiency Output 3.3V 5A mini560 Step Down DC-DC Converter Voltage Regulator Buck Stabilized Power Supply Module : Electronics
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Amazon.com: 2PCS DC-DC Boost Converter, DC-DC 3.3V-13V to +15V/-15V Positive Negative Dual Step-Up Converter Board : Electronics
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