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7912 as negative voltage regulator issue

Kaash

Aug 16, 2013
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Aug 16, 2013
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hi guys..
im using 7912 as negative voltage regulator but when i connected it with 12v or 20v supply it got very hot without any output voltage.
i wasted 4-5 regulators but get no output -12, is there other any way to connect it?
help plz.
thanks

79xx Pin Out and Application Circuit.jpg
 

BobK

Jan 5, 2010
7,682
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Jan 5, 2010
Messages
7,682
You have the ground and power reversed. For a negative regulator the ground has to be higher than the input.

Edited: You also need the capacitors on the input and output. See the datasheet.

Bob
 
Last edited:

BobK

Jan 5, 2010
7,682
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Jan 5, 2010
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Look up the datasheet. It has a sample circuit.

Bob
 
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