The RY3708/RY3750 booster power supply board costs 3 yuan on Taobao, but it costs 1.5 yuan to make it yourself. I feel like I am losing a lot. RY3708 https://item.szlcsc.com/344516.html RY3750 https://item.szlcsc.com/344520.html The performance is very good, and the 1A output is real.
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