What are the advantages and disadvantages of transistor series voltage regulator?

Advantages:

• The transistor series voltage regulator has series loss element to maintain the output DC voltage constant.
• It has output voltage remains constant in spite of change in temperature.
• The output impedance is very low.
• The transistor series voltage regulator has low ripple content in the output DC voltage.
• It has series loss element to maintain the output DC voltage constant.
• It has better voltage regulation than that of shunt regulator.
• It has good efficiency even for small currents loads.

Disadvantages:

• It has not so good voltage regulation for large loads currents.
• The series pass transistor should be power transistor and it has to be mounted on a suitable heat sink. This makes the series regulator circuit bulky and heavy.
• The output voltage cannot be changed easily as no such means is provided. Therefore the DC output voltage is not adjustable.