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power supplies +5v and -5v will be given to 7 and 4 pins respectively,therefore it is used for giving power suppply to ic 741
5v
5V
Some simple 3 terminal single chip linear regulators are:+5V - 7805, LM309, LM323-5V - 7905, LM320Some high efficiency single chip switching regulators are: +5V - LM2574-5.0, LT1076-5-5V - LT3015-5Note: always read the datasheet carefully to make sure a part meets the requirements of your application before designing around the part.
It is depend on your requirement .suppose you need a voltage regulator of 5V than you need 5V Zener diode.