Hobby grade R/C cars with high voltage batteries require some form of voltage regulation. The batteries in those vehicles are typically 11.1V to 22.2V, while the required voltage for the radio system components is 6.0V to 7.4V depending on their ratings. Current draw with some of these systems normally ranges from 3A to 6A, as well. Some electronic speed controls in the R/C industry have this capability, but many do not, and it is a common point of failure for those that do.
This circuit provides the necessary regulation and power supply for high powered R/C systems common today. The center of the circuit is the RT8298, a synchronous high voltage Buck Converter that can support the input voltage range from 4.5V to 24V and the output current can be up to 6A. The voltage dividers that set the output voltage to 6V or 7.4V are controlled by a simple switch that the user sets to the voltage they want.