It is an LM317T Adjustable Voltage Regulator.?They are designed to supply more than 1.5 A of load current with an output voltage adjustable over a 1.2 to 37 V range. The nominal output voltage is selected by means of a resistive divider. This makes the device exceptionally easy to use and thereby eliminating the need for stocking of many fixed regulators.
? Output Current in Excess of 1.5 A
? Output Adjustable between 1.2 V and 37 V
? Internal Thermal Overload Protection
? Internal Short Circuit Current Limiting Constant with Temperature
? Output Transistor Safe?Area Compensation
? Floating Operation for High Voltage Applications
? Eliminates Stocking many Fixed Voltages