In this video, I have designed a simple 5 volt 1 amp DC power supply from AC mains (230V/120V AC) using an LM7805 voltage regulator.
After watching this video you can easily make the 5 v power supply within 5 minutes.
You can use this 5-volt regulator to supply your Arduino circuit or any 5v USB gadgets. This 5 volt supply can also be used as the mobile charger.
In this project, I have not used Heat Sink with LM7805 but I will suggest you use a heat sink with 7805 ic.

The whole process of making this 5 v supply is shown in steps so you can easily design this 5v regulator.

The required components are:
1. LM7805 regulator
2. 0.1uF Capacitors (2nos)
3. 470uF Capacitor (1 no)
4. Diode 1N4007 (4nos)
5. Step Down Transformer [230/120V - 9V]
6. Connector
7. Connecting wires
8. Zero PCB

Working Principle of this 5 v DC source:
First, we are using a step-down transformer [Secondary rating 9V and 1 amp] to step down 230V/ 120V AC supply to 9 Volt AC. Then we rectify the 9V AC to 9 V DC using a diode bridge rectifier [Full wave rectifier]. After the rectifier, we have used Capacitors to filter the ripple from the circuit and fed it to the input of LM7805 voltage regulator. LM7805 regulate the 9 volt DC to 5 Volt DC and at the output of 7805 ic, we get constant 5 Volt DC output.

To design a 5 volt DC power supply from 9-volt battery please refer the following link:
[ Ссылка ]


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