For starters, this is NOT an MP2307 chip, it's an MP1484. The MP1484 is a cheaper little brother with a smaller input range and lower efficiency. If you tell me it's MP2307 in the description and you give me something else, well. It's dishonesty at best, cheating at worst, brother. So far, 50% of devices do nothing when turned on. Trimpot is possibly the cheapest e-waste from China. It's bulky, difficult to set up, and the output voltage will fluctuate around +/- 0.4 volts before leveling off. until the next time you touch it or the temperature changes. Many of them are returning.
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