IC-LM2576-5.0. (DC to DC step down voltage regulator) It is a very interesting number. It maintains a constant the voltage of approximately 5 volts and current 3A. Compatible with the device easily. On the manufacturer’s manual. I smile with ease. It is very easy to use. as Figure 1. Will see that, there are only four more devices only are C1-100uF , D1-1N5822,L1-100uH, C2-1000uF. The input voltage levels is 7volts to 40volts. My favorite feature is the runs with high frequency. IC is not hot. It can hold a small cooler. And Used continuously for a long time.