Training to use XL4015 DC-DC Step Down Adjustable Module?

How to use XL4015 DC-DC Step Down Adjustable Power Supply Module? for beginners step by step.
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In this video, I show the correct installation method of input and output wires. After connecting the wires, I use a 12V adapter to power a 5V MP3 player module. I also increase the output voltage to 12 with a power supply and turn on the 12-volt fan. We will measure everything with a multimeter and show you.
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Input: 7-38VDC
Output: 1.25-36VDC adjustable
Output current: 0-5A
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my Tools:
Step Down Adjustable Power Supply Module: https://tinyurl.com/yr5a2amb
DT9205 multimeter: http://bit.ly/3HomdEb
24V 2A Power Supply Adapter: http://bit.ly/3Pjfyx8
12V 5A Power Supply Adapter: http://bit.ly/3W7HuGt
fan 4*4mm 12V: http://bit.ly/3Yb456J
MP3 PLEAYER module 5V:    • How to install Bluetooth MP3 Player D...  
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DC DC Step Down XL4015 Buck Converter

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