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Zener Diode as Voltage Regulator





Insert Key Button:This is used to insert key on the switch connected with battery. This key is only activated when the connection is perfect.

Choose Zener Diode: This combo box is used to select different zener diodes having different zener voltage

Series Resistance: Value of the Series Resistance can be directly input here.



Rheostat value: Rheostat can be controlled by using this slider

Load Resistance: Value of load resistance can be set or change by using this slider



Reset Button: To reset all the connections




Using the circuit diagram, identify the connections in the given platform. Connections are made as shown in the below diagram.


How to make connections in simulation ?


Click one end node of the battery and drag to the next position, where we want to connect the wire. Just like shown in the figures below:


                                            (a)                                                         (b)                                                      (c) 

 Like this, make all the connections are perfect.


Full connection diagram 



 If the connections are correct, Insert Key option activated


Line regulation


  1. Choose the zener diode to start the experiment.
  2. Insert the series resistance value.
  3. Fix the load resistance value by using Load Resistance slider.
  4. Change the Rheostat value from maximum to 0 by the interval 100.
  5. Note down the corresponding input voltage and output voltage and tabulate it.
  6. Plot the graph in which VIN at x-axis VL at y-axis.


Percentage of Line regulation =«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mfenced close=¨]¨ open=¨[¨»«mfrac»«mrow»«mo»§#8710;«/mo»«msub»«mi»V«/mi»«mn»0«/mn»«/msub»«/mrow»«mrow»«mo»§#8710;«/mo»«msub»«mi»V«/mi»«mrow»«mi»I«/mi»«mi»N«/mi»«/mrow»«/msub»«/mrow»«/mfrac»«/mfenced»«mo»*«/mo»«mn»100«/mn»«/math»

 Load Regulation


  1. First 3 steps are same as above.
  2. Fix the Rheostat value, to get the 12 V at voltmeter across rheostat. 
  3. Change the load Resistance with the interval of 100 Ω/1000 Ω up to maximum range.
  4. Note  the reading and tabulate it.
  5. Plot the graph between V0 along x-axis and RL along y-axis.

Let us consider VNL is the output voltage when there is no load resistance (ideally VNL = Zener voltage) and VFL is the output voltage when load resistance is maximum. 

Percentage of Load regulation =«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mfenced close=¨]¨ open=¨[¨»«mfrac»«mrow»«msub»«mi»V«/mi»«mrow»«mi»N«/mi»«mi»L«/mi»«/mrow»«/msub»«mo»-«/mo»«msub»«mi»V«/mi»«mrow»«mi»F«/mi»«mi»L«/mi»«/mrow»«/msub»«/mrow»«msub»«mi»V«/mi»«mrow»«mi»N«/mi»«mi»L«/mi»«/mrow»«/msub»«/mfrac»«/mfenced»«mo»*«/mo»«mn»100«/mn»«/math» 

Note: This is an ideal circuit. For a real circuit, there will be small variations in output voltage with varying input voltage or load resistance.


Cite this Simulator:

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