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Aim
To understand the working and design circuit of zener diode as voltage regulator using zener diode, potentiometer, multimeter and suitable resistances.
Introduction
Zener diode is a p-n junction diode with high amount of doping, so as to decrease the width of p-n junction depletion layer which leads to large amount of electric field in depletion layer for small potential difference across zener diode.
Voltage regulator circuit have application in various filed of electronics where a constant voltage is required, zener diode is its important component without which voltage regulation is not possible.
Apparatus used
Zener diode
Circuit board
Wires
9V battery and battery connector
LED (5mm, 1.5V)
Resistors
Push button type toggle switch
Potentiometer (10KΩ)
2.)Understanding the functioning of zener diode as voltage regulator
3.)Circuit diagram used in making of voltage regulator using zener diode
Conclusion
The output of zener diode is constant and equal to its breakdown voltage, rest of the potential difference is dissipated across a series resistance in form of heat.
Sources of errors
Write yourself
Precautions
Do not connect any electronic component without resistance in series, it can burn the component.
Applications
In inverters, voltage stabilizers, battery eliminators and almost all electronic devices.
Bibliography
NCERT textbook of class 12
Physics by S.L.Arora
Circuits available on internet