5V DC Power Supply | Circuit Connections |

Summary

In this tutorial, Rasha Karilingar, an Electronics and Communication instructor, demonstrates how to build a 5V DC power supply circuit using a bridge rectifier, capacitor filter, and a 7805 voltage regulator. The process includes step-by-step instructions on wiring components like diodes, capacitors, and the regulator IC on a breadboard. By connecting a step-down transformer, the system provides the desired 5V output. The video also covers component identification and grounding, making it a comprehensive guide for creating a reliable power supply for electronics projects.

Takeaways

• 😀 The video demonstrates how to build a 5V DC power supply circuit using a bridge rectifier, capacitor filter, and a 7805 voltage regulator.
• 😀 The components required for the circuit include a transformer (12V rating), 4 diodes (1N007), a 470uF electrolytic capacitor, two 0.01 ceramic capacitors, and a 7805 voltage regulator IC.
• 😀 The transformer steps down the AC voltage from 230V to 12V at the secondary winding for use in the circuit.
• 😀 The diodes are arranged in a bridge configuration to convert AC to DC, with special attention paid to identifying the anode and cathode on the diodes.
• 😀 An electrolytic capacitor of 470uF and two 0.01 ceramic capacitors are used to filter the output, smoothing the DC voltage after rectification.
• 😀 The 7805 voltage regulator is used to maintain a steady 5V output, with its pins identified for input, ground, and output.
• 😀 The ground of the circuit is a common point where the two diodes' anodes meet, and the regulator’s ground pin is connected to this point.
• 😀 Connections are made carefully on a breadboard, ensuring the diodes and capacitors are placed correctly in relation to each other.
• 😀 The video emphasizes the importance of correctly wiring the diodes and the transformer connections to ensure proper DC output.
• 😀 The expected output voltage of the circuit is approximately 5V, with a final check using a multimeter, showing 4.93V as the measured voltage.
• 😀 The video concludes with a request for viewers to subscribe to the channel for more educational electronics content.

Q & A

What is the purpose of the circuit described in the video?

The circuit is designed to provide a stable +5V DC output using a bridge rectifier, capacitor filter, and the 7805 voltage regulator.

What are the key components required for the circuit?

The components required are a transformer, four diodes (1N4007), a 470 µF electrolytic capacitor, two 0.01 µF ceramic capacitors, the 7805 voltage regulator IC, connecting wires, and a breadboard.

What is the function of the bridge rectifier in the circuit?

The bridge rectifier converts the AC voltage from the transformer into a pulsating DC voltage.

How can the diodes in the bridge rectifier be identified physically?

Diodes can be identified by a silver strip on one side, which marks the cathode. The opposite side is the anode.

What is the purpose of the 7805 voltage regulator?

The 7805 voltage regulator ensures a stable +5V output by regulating the voltage, making it suitable for powering low-voltage electronic components.

What type of capacitors are used in the circuit?

An electrolytic capacitor of 470 µF is used for filtering, along with two ceramic capacitors of 0.01 µF for further smoothing and stabilization.

How do you identify the pins of the 7805 voltage regulator?

The 7805 has three pins: Pin 1 is the input, Pin 2 is ground, and Pin 3 is the output.

What is the role of the ceramic capacitors in the circuit?

The ceramic capacitors are used for further filtering and noise suppression to ensure the output is stable and clean.

What AC voltage is required for the transformer in this circuit?

The transformer should have a 230V AC input and a 12V AC output at the secondary winding.

How do you test the final output of the circuit?

You can test the final output using a multimeter set to DC voltage mode. Connect the multimeter probes to the output and ground, and the expected output should be approximately 5V DC.