An electronic control for determining knocking in an internal combustion engine having an intake injector for injecting fuel into an air intake port and an in-cylinder injector for directly injecting fuel into a combustion chamber. The beverage insulator includes a body for receiving and insulating a bottle or a can, and one or more foldable members to insulate a bottle neck in the bottle configuration, and a can in the can configuration. A slide-out extension mechanism extends and retracts the slide-out room in a cantilevered manner. At least one of the rectifying circuits comprises a phase shifting element that provides a phase shift at the AC line frequency. The process is repeated for each of the other two sets of pins.