Introduction to Power Supply

In this article, we will focus on introducing the fundamentals of electronics. What we aspire to do in is to empower the users by providing hands-on tutorials that will help our customers learn and design their very on embedded electronics.

Needless to say, the part used within this tutorial is available in the BitByteLab’s Shop section.

So what is a power supply?

A power supply is a collection of electronic components that supplies power to a systems i.e. computer, mobile phone, TV and the list goes on. Power comes in varying sizes and capacity. A typical computer power supply looks like this.


A typical computer power supply
A typical computer power supply

One of the fundamental job of a power supply is to provide constant power to the components to make them tick. All electronics runs on electricity, that’s the harsh reality of our world. The power that we get in our home socket is Alternating Current (AC) but most microelectronics require a fixed Direct Current (DC) Supply.

Recall, AC changes its polarity at a fixed interval while DC stays fix as shown in the image below.

In order for your microelectronics to function, it is necessary to provide DC power to each components. The systems that converts AC voltage to DC voltage is a Power Supply. Moreover, a power supply is also able to reduce, increase and stabilise a voltage by means of internal components such as a Voltage Regulator, Bulk Convertor and Boost Convertor.

In the next part of this tutorial, we will focus on creating a power supply that can help you reduce your 9V battery in to a constant 5V power source by means of simple off-the-shelf components.


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