Cheap And Discounts LM2596S DC-DC DC Adjustable Step-down Power Supply Module Regulator Board 3A 3.2V~40V to 3.3V/5V/12V Wholesale. Buy Directly From Merchant All modules Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.