No great problem, just put in a resistive voltage divider on the voltage sample line, so the regulator sees 28/80 th the output voltage. Then the limits are the voltage rating of the field pass transistor and the voltage ratings of the rectifier diodes. Long ago, car alternators used to be able to run 120 volts DC with an adapter between the regulator and the alternator, but these days they fry the diodes because while diodes are better controlled the makers choose lower voltage rated diodes to save money.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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