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power supply -5 V


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why I use IC 7905 with 1 gnd 2 input and 3 output not afford -5 V but when I saw in multimeter one with other multimeter have report -2,... V not -5 V. And i ever buy 7905 other but consistent with the report is same. Why ??? please help me and thanks very much :)

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lukas,

you must be sure of your input voltage, your connections should be correct from the first time, i mean if you reversed 2 and 3 and then discoverd your mistake, the ic may be burnt out and you will use it defected in the next time.
note that the input max voltage is -7 and input min voltage is -25

try again ;)

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