Hi All, I have two designs using a zener diode for volatge regulation at 24V supply volatge. I like to know which is a better design to go with. Please see attach image. The load device is an active buzzer, that uses 15ma at 4v. Design #1: I have a shunt zener regulator using a resitor that would need to be a high power resistor at least 500mw. On design #2: which I intent to use becuase is much simpler and seem to be okay after doing some calculations. For instance, with a 20V and 1W zener diode, will allow the buzzer device to have its 4v and will consume 15ma which will be below the zener max current of I=p/v=1W/20V=50ma. Will I be okay using design#2.
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