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Some problems about the circuit of my source
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:http://www.kynix.com/uploadfiles/pdf9675/LM7812CT.pdf )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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