VERTER 5V USB Buck-Boost - 500mA from 3V-5V / 1000ma from 5V-12V [TPS63060] : ID 2190 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Régulateur abaisseur 12V à 3V DC max 15W Converter / HaverCo | bol.com
Amazon.com: 12V to 3V 3A Step-Down Waterproof Miniature DC-DC Converter Power Supply Module : Electronics
12v To 3v Converter Circuit | DC To DC Converter - YouTube