I am using ST 7812 regulator the problem I face is the voltage out I get
normally is constant 11.9 or 12.03 V.  Some of the parts after use for
fews day or 1 month, the voltage out drop to 8.9 V and it is unstable
waving between 8.9 to 11.9 V. What is the reason of this and how to
avoid this ?

James

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