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The most complete review and detailed testing of the DC-DC converter based on the LM2596 chip with a voltage indicator and output voltage adjustment. Load test in different modes, measuring the heating of the chip, how the thermal protection works. Tests with an oscilloscope. These converters are very popular on AliExpress, eBay, Bangood and other online stores. They cost $ 4-5 with an indicator: http://goo.gl/VXtvRN And ~ $ 1 without an indicator: http://goo.gl/Y5LfPX