Sold in the market which is connected to the car’s cigarette lighter socket usb charger kit circuit input voltage of 24 volts to 12 volts 24v batteries used in larger vehicles use the phone, can be used to charge... Electronics Projects, 5V USB Car Charger Circuit with MC34063 Stepdown DC DC Converter "battery charger circuit, dc dc converter circuit, power electronic projects, " Date 2014/06/22