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    The power supply has a small board holding the control circuitry. This board compares the voltages against a reference to generate the feedback signals.

    I am curious how the board stores a reference voltage, if anyone knows. Dissimilar metals?

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      Check out footnote 8, which mentions the voltage reference, and has a link to another of his posts which has information about just that component: http://www.righto.com/2014/05/reverse-engineering-tl431-most-common.html

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        Neat, thanks.