How to make a Fix 5V DC Power Supply using Zener Diode and OPM || What is a Zener diode & BJT?

How to make a Fix 5V DC Power Supply using Zener Diode and OPM || What is a Zener diode?

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Zener Diode as a Voltage Regulat.

What is a Zener diode and how is it used as a voltage regulator?
How does the breakdown voltage of a Zener diode affect its operation as a voltage reference?
What is the difference between a Zener diode and a regular diode?
Can a Zener diode be used as a voltage comparator? How does it compare to an OPM?
What are the advantages of using an OPM as a comparator instead of a Zener diode?
How do you choose the right Zener diode or OPM for a given application as a comparator?
What are the typical applications of Zener diodes and OPMs as comparators in electronic circuits?
How do you calculate the voltage output of a Zener diode or OPM as a comparator in a given circuit?
What are the limitations and challenges of using a Zener diode or OPM as a comparator?
What are the potential sources of error when using a Zener diode or OPM as a comparator and how can they be mitigated?