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Try the following circuit ..
You can add 3 x 33V zener diodes (connected in series) in parallel with the potentiometer and, depending on the unregulated voltage, a resistor between (+) unregulated voltage and 500kΩ potentiometer//99V zener diode(s) ..
If you do it, you will have ≈99V voltage reference and the output voltage will be adjustable between 0 and 99V ..
There are several question abour ur need: 1)regulation on voltage? 2) out put watt? 3) linear or switching P.S.? 4) average current and peak curren? 5)........ n) what is ur application?
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