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Resistor Divider Calculator E96 . V s is the source voltage, measured in volts (v), r 1 is the resistance of the 1st. E3 50% tolerance (no longer used) e6 20% tolerance (now seldom used) e12 10% tolerance. Resistor Divider Calculator E12 from aboutwhatever-a.blogspot.com The best pair using e series can be found here. Which, as it turns out, can be obtained almost exactly by using two simple 3k9 and 36k resistors. Assumes the required output current to be negligible.