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LM2596 DC DC Step Down Converter Voltage Regulator LED Display Voltmeter 4.0~40 to 1.3-37V Buck Adapter Adjustable Power Supply

5/10pcs DC-DC Buck Converter Step Power Supply Module 5V-30V To 3.3V 5V 9V 12V 3A Voltage Regulator for Car Motorcycle Battery

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Adjustable Output LM2596S Step Down Module DC to DC Buck Converter Voltage Regulator Conversion Power Supply Module LM2596