DC power supply is very important instrument used in laboratory. All electronic circuits work ONLY on DC power supply. They cannot work on AC. DC supply can also be obtained from batteries. But the batteries are costly and require maintenance. So a DC power supply is used, in which mains AC voltage of 230V is converted into DC voltage of the required value. This DC voltage is pure and almost resembles the DC voltage of a battery. Such DC power supply is economical also. It does not require maintenance and it consumes very little electrical power. So such DC power supply is preferred over the battery supply.
In this chapter, we shall study the three types of power supply circuits which convert AC voltage into DC voltage. They are HWR, FWR and BR. This chapter also covers the regulator circuits to keep the DC voltage to a constant value, irrespective of changes in mains voltage.
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