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This is a 5-piece set of DC-DC step-down power supply module built with high-quality AMS1117 LDO chip. It efficiently converts 5V input to steady 3.3V output with maximum 800MA load current. Featuring low noise, low ripple and high conversion stability, it provides reliable voltage regulation for MCU, sensors and various small electronic devices. Compact board design is easy to install and wire, ideal for electronic DIY projects, Arduino development, circuit power matching and laboratory use.