7805 outputs 5 volts. Like carnut101 already pointed out, wall transformers are usually nonregulated. That means that 12 volt transformer might be outputting 17 volts when not loaded. That is why you should use this regulator so that the output of the unit will never exceed that 5 volt limit. If you need 12 volts, you can use 7812 for that. I did the same with my
ModLab.
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