Pololu 12V 2.2A DC-DC Step-Down Voltage Regulator – ProgressiveRC
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Pololu 5V, 500mA Step-Down Voltage Regulator D24V5F5 - RangeVideo
DC-DC Adjustable Step-Down Voltage Regulator Module. 1.5-35VDC Output @ 2A
DC-DC Adjustable Step-Down Voltage Regulator Module. With Volt Meter.
12V, 4.5A Step-Down Voltage Regulator D36V50F12 - RobotShop
Voltage Regulator XL4015 Step Down Buck Switching DC-DC Converter 36V/ – Sunhokey Electronics Co., Ltd