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三端正电源稳压电路系列78XX系列是用于各种电视机、收音机、电子仪器设备的三端稳压电路。目前该系列主要有以下几个品种：7805,输出电压为5V；7806,输出电压为6V；7808,输出电压为8V；7809,输出电压为9V；7812,输出电压为12V：7815,输出电压为15V,7818,输出电压为18V；7824,输出电压为24V。78XX系列电路的主要特点是：输出电流最大可达1．5A,内含过压保护、过流保护以及温度保护功能。
Three-terminal positive power regulator circuit series 78XX series is used for a variety of TV sets, radios, electronic equipment, three-terminal regulator circuit. At present, the series has the following varieties: 7805, the output voltage is 5V; 7806, the output voltage is 6V; 7808, the output voltage is 8V; 7809, the output voltage is 9V; 7812, the output voltage is 12V: 7815, the output voltage is 15V, 7818, the output voltage is 18V; 7824, the output voltage is 24V. 78XX series of circuit’s main features are: the maximum output current up to 1.5A, including over-voltage protection, over-current protection and temperature protection.