Designing 5v DC power supply from Domestic Power Supply

The only power source available in our house is the Domestic power supply which we use to run home appliances such as Fan, AC, Mixer, tube-light etc.

How these power is supplied to our home for domestic use and what are the voltage, current and power requirement for our different home appliances?

We also use this power supply to charge our smartphones, tablets, laptops, torch and various other battery operated gadgets with the help of charger/power adapter.
So here is something interesting happening inside the charger/power adapter, our domestic supply is converting into supply suitable for charging your gadgets battery.
This means for various gadgets we cannot use the domestic power supply directly, but we need some kind of intermediate device to do that conversion.

So would you like to tell us the nature of Domestic power supply and supply required for charging gadgets battery (consider smartphone)? You may like to read what is written on your smartphone charger.

Now lets make this discussion little more interesting by designing a basic regulated power supply.

So here is our mission:

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There are different blocks used in this conversion inside regulated power supply lets look at the physical circuit of power supply and figure out what are their duties.

Lets explore and discuss on this regulated power supply.

You can also try to make this circuit and simulate it on circuit simulator. One of the online open source circuit simulator is given below, you can use this.

Please feel free to ask any question.

You can also join us in live discussion during weekdays from 11:00 am to 12:30 pm about gadgets in our everyday life.

Here is the room link to Join: Chatshaala

Note: Please take some experts supervision/help while fabricating this circuit. The circuit deals with High AC voltage, if not handled carefully could lead to danger.

Below are some references you can read:


Step by step method to design 5V DC power supply
Step 1: The selection of regulator IC. …
Step 2: The selection of transformer. …
Step 3: The selection of diodes for bridge. …
Step 4: The Selection of smoothing capacitor and calculations. …
Step 5: Making the power supply safe.