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Check the listing for details. DC Voltage Regulator Module with Built in XL4016 Chip and Heat Sink Cooling. Condition: New. Listed at 21.41 USD. High-power digital DC step-down module with built-in XL4016 chip. Copper core with high inductance. Inductors operate with limited AC current. Can be combined with resistors or capacitors to form high-pass or low-pass, phase-shifting circuits, and resonant circuits.