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Some problems about the circuit of my source

By ling1995 ·
Tags: Hardware
Good afternoon~

My transformer can electrolysis the capacitor through rectifier bridge by output two 18V (three threads in here) and then give LM7812(this is its datasheet: )and 7**2 electricity.Now my trouble is :
When the outputted voltage of transformer passing rectifier bridge ,the outputted voltage is 18V normally.However,when the voltage became odd after going through electrolytic capacitor--50V1000uf. The positive voltage rose into 28V from 18V. This situation leads to the 7812 burned.Why? How to solve ?

Thanks a lot!

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