BUY KA7909 https://www.utsource.net/itm/p/11300028.html

The KA7909 is a three-terminal positive voltage regulator with a TO-220 package. It is designed to provide a constant voltage output of 9V and a maximum output current of 1A. The device is suitable for use in a wide range of applications, including on-board regulation for personal computers, instrumentation, and other systems. It features a thermal shutdown circuit that protects the device from overheating, and a reverse-battery protection circuit that prevents damage to the device in the event of a reverse-polarity connection. The KA7909 also features low dropout voltage and low output noise, making it an ideal choice for applications requiring high accuracy and low power consumption. (For reference only)