hello. i have a question. i built a power supply whose desired to have an output of regulated 12vdc, the problem is when i've done the assembly, when i test it the output becomes 20vdc right after bridge rectifier, while i've supplied it with 18vac. what shoul i do to make its output 18vdc or lil bit lower.? also when it passes thru regulator, it doesnt change the output voltage. i really hope for your help.
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