DC-DC 12V To 3.3V 5V Buck Step down Power Supply Module (2 Pack) – phillipjfry
Amazon.com: ACEIRMC 3pcs USB Buck Boost Converter 3.5V-12V to 1.2V-24V DC-DC Step Up Step Down Power Supply Module Voltage Regulator 5V to 3.3V 9V 12V 18V 24V : Electronics
Ac-dc 3.3v/5v/12v Precision Buck Converter Ac220v Todc 3.3v/5v/12v Dc Step Down Transformer Power Supply Module 1a 12w | Fruugo NO
3a 4ch 4.5-30v To 3.3v 5v 12v Dc Dc Step-down Buck Converter Module Lm2596 Ams1117 7805 7812 Mp2307 Mp1584 | Fruugo DK
12v to 3.7v Buck Converter, DROK DC 8-35V to 3.7V 3A 11W Voltage