The Power Supply
Unit can be identified as the metal box inside the cabinet that has a fan
attached to its rear. It provides the required and accurate power supply
to hardware devices and the motherboard, which in turn distributes it to
different circuit regions, channelling electric current to other smaller
devices and chips that need some voltage to perform embedded tasks, e.g.
the indicators and the computer speaker. The servomotors mainly control
the power supply unit, which is called as ‘Switch Mode Power Supply’
(SMPS). In a typical AT power connector based system, one set of wires
usually enclosed in a single cable casing connects to the power, turbo,
and reset switches on the front panel of the cabinet. The remaining set
of wires is usually grouped into a group of four wires that is used to
connect to hard disk drives, floppy disk drives and optical media drives.
A wider set of wires connects to the motherboard directly, powering all
the smaller components. Most SMPS come with enough sets of wires that allow
connecting to three hard disk drives, one floppy disk drive, and one optical
media drive.
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