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The LM2596 Constant Current / Constant Voltage Buck Regulator Module is great for charging batteries, driving LED’s and measuring electrical outputs.
If you need to buck high voltages down to workable voltages for electronics, this LM317 DC-DC Step-Down Module is a simple & elegant solution.
This DC-DC Boost 3A 30V is based on the LM2587 Boost IC, and boosts an input of 3.5V-30V up to an output of 4V-30V – At a maximum output current of 3A.