--> read the datasheet.Also, this zener is listed as "small signal diode". Will it work for regulating the supply (few mA)?
Other informations you need to decide:
* What load voltage (output) range do you want for your circuit?
* is the output current considered to be DC, or are there times with higher or lower current?
* What power dissipation / temperature rise can you accept?
Unlikely. Besides temperature dependent variations, the current consumptions of most linear circuits is to some extent modulated by the signals level and operation mode transitions. In any case, even a constant load current causes a voltage drop across the series resistor. Question is how much you can tolerate?The output current should not vary.
Review your requirements.1) The circuit can operate at 3.3V or 5V, hence why I am using a 5.1V zener to protect the circuit from any voltage above this level.
Why two regulators?I will be using two regulators
Please explain: "The circuit" means:I need the circuit to operate at either 3.3V or 5V
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