There are three major kinds of power supplies.
Unregulated power supply circuit diagram.
Simple dc regulators 12v 15v 30v.
The output of the transformer is a pulsating sinusoidal ac voltage which is converted to pulsating dc with the help of a rectifier.
For example digital circuits preamplifiers etc.
1 5v 3v adapter usb to 1 5v or 3v converter circuit small uninterruptible ups.
A lot of 6v supply diagrams.
Which now i will explain to you learn the unregulated power supply first.
An unregulated power supply is the most rudimentary type consisting of a transformer.
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Some called these power supply that ac adapter.
It is good for a normal load.
The circuit diagram indicates that the output of the power supply can be connected to the mains earth the dotted line.
Unregulated also called brute force linear regulated and switching the fourth type of power supply circuit called the ripple regulated is a hybrid between the brute force and switching designs and merits a subsection to itself.
The circuit diagram of unregulated power supply above is designed to supply a 25 watts power amplifier based mosfet.
In india a 1 ΓΈ supply is available at 230 volts.
Unregulated power supply diagram as shown in the figure above a small step down transformer is used to reduce the voltage level to the devices needs.
You need to use a regulated power supply.
Digital dc regulator if you are looking for 5v dc power supply for the digital.
If you use other specific loads.