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5 volt to 3.3 volt


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I showed and explained why a low voltage zener diode makes a lousy regulator.
IF the input voltage changes (but it doesn't here), and IF the load current changes (we didn't know that it doesn't here) then it is a lousy regulator when the temperature changes because its voltage changes.
Also, IF the load current drops then a zener diode wastes current.

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