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About 5V Buck Converter Module: It is a mini DC-DC step-down power module based on MP1584 and it output 5V voltage. It is small size£¬ light weight£¬ especially for model airplanes£¬ smart car£¬ Arduino DIY and other items. Features: - Module type: Non-isolated step-down module (buck); - Input voltage: 7-28VDC; - Output voltage: 5VDC+/-2%; - No load current: less than 0.5mA; - Output Current: 2A (MAX); - Continuous current: 1A (MAX); - Conversion efficiency: 92% (MAX); - Switching Frequency: 1MHz typical. About Adjustable Buck Converter Module: It is a mini DC-DC step-down power module based on MP1584 and its output voltage can be adjusted via the on-board potentiometer. Features: - Module type: Non-isolated step-down module (buck); - Input voltage: 7-28VDC; - Output voltage: 0.8V-20VDC; - No load current: less than 0.5mA; - Output Current: 2A (MAX); - Continuous current: 1A (MAX); - Conversion efficiency: 92% (MAX); - Switching Frequency: 1MHz typical.