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Description: circuit diagram with full detail======tinyurl.com/yxfaml7e video no 2 for more detail=========tinyurl.com/y5sxxng9 LM 317 Regulator It is a type of positive-linear-voltage regulators used for voltage regulation ,designed by Robert C in 1976 while he worked at National Semiconductor. It is a three-terminal-adjustable-voltage regulator and is easy to use Because it has only three terminal to use. It is majorly used for local and on card regulation. If we use fix resistors with this regulator then it can also be used as fix output like 7805,7806,78XX and so on, The LM317 is a fully adjustable positive voltage regulator that can control 1.5 amps with an output voltage from 1.25 volts to 30 volts. By using the ratio of two resistances one of a fixed value and the other variable or both fixed,.we can set the output voltage to our desired level. Total input can be given to this regulator from 3 to 30 volts DC.