PCB Explained | What is PCB ? Types of PCB | Fabrication process of PCB Explained @ALLABOUTELECTRONICS

Uploaded September 2025 | Updated September 2026, 3 weeks ago

*In this video, what is PCB, Types of PCBs and the Fabrication Process of 2-Layer and 4-Layer PCB is explained in detail.*

The following topics are covered in the video:
0:00 What is PCB? Why it is called Printed Circuit Board?
3:22 Why PCBs are used?
5:06 Types of PCBs
9:52 Fabrication Process of 2-Layer PCB
16:32 Fabrication Process of Multi-layer (4-Layer) PCB

*What is PCB?*
_PCB is a Printed Circuit Board, where a conductive path / copper traces of the electrical circuit are created on the insulating base through printing and etching process._

*Why PCBs are used in Electronic and Electrical System?*
The use of PCB offers following advantages.
_1) Compact Design and Space Efficiency_
_2) Enhanced Reliability and Durability_
_3) Time and Cost saving during mass fabrication_
_4) Superior Electrical Performance and Reduced Noise_

*Types of PCB:*
_Based on the No. of Layers_
1) Single Layer PCB
2) Two Layer PCB
3) Multi Layer PCB

_Based on the Flexibility_
1) Rigid PCB
2) Flex PCB
3) Rigid-Flex PCB

In this video, the fabrication steps of two-layer PCB and Multi-Layer PCB are also covered in detail.

_The link for the other useful videos:_

*1) Different IC Packages Explained:*
youtu.be/6UrTvTjGR4Q

*2) PLC vs Micro-controller:*
youtu.be/_g9j94XPnpQ

*3) What is Real Time Clock (RTC)? How RTC works? Applications of Real Time Clock*
youtu.be/cCBu2VN0fu0

This video will be helpful to all the students of science and engineering in understanding what is PCB, why it is used, types of PCBs, and the fabrication process of 2-layer and 4-layer PCB.

#allaboutelectronics
#pcb
#printedcircuitboard

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$Introduction to Feedback Amplifier | The concept of Negative Feedback and its advantages In this video, what is feedback in the electrical circuits, the types of feedback, the general structure of the feedback amplifier and the effect of negative feedback on the amplifier circuit are explained in detail. The following topics are covered on the video: 0:00 Introduction 0:50 What is Feedback and Types of Feedback 2:15 Advantages of Negative Feedback 4:00 Basic Structure of Feedback Amplifier 7:40 What is Loop Gain and Effect of Loop Gain on Amplifier 11:16 Concept of Virtual Ground / Virtual Short in op-amp (from feedback amplifier perspective) _For more videos on op-amp, check this playlist:_ https://youtube.com/playlist?list=PLwjK_iyK4LLDBB1E9MFbxGCEnmMMOAXOH&si=7HG0DXJmuhJjDNmt _For more videos on Oscillators and Multivibrators, check this playlist:_ https://youtube.com/playlist?list=PLwjK_iyK4LLCVdgBR30pSFVj-17TI_8ou&si=gNO6jGsO0s3xmKJ3 *Feedback in Electrical / Electronic Circuits:* In the electrical/ electronic circuits and in control systems, the fraction of the output signal is sampled using the feedback network and it is feed back to the input side. On the input side, using mixer / comparator circuit, the feedback signal is either added or subtracted from the source signal. *Negative Feedback:* In the negative feedback, the feedback signal is subtracted from the source signal. In this type of feedback, the actual input to the circuit or basic amplifier is less than the source signal. This type of feedback is used in amplifier circuits and control systems to improve the overall stability. *Positive Feedback:* In positive feedback, the feedback signal is added with the source signal. This type of feedback is used in oscillators and multivibrator circuits. _Effect of Negative Feedback on the Amplifier:_ 1) Desensitises the gain 2) Reduces Non-Linear Distortion 3) Reduces the effect of noise / interference 4) Increases the bandwidth 5) Depending on the feedback topology, it modifies the input and output impedance. 6) Reduces the gain of the amplifier In this video, the general structure of the feedback amplifier is explained and the expression of the closed loop gain of the amplifier is derived. Moreover, the concept of loop gain and its effect on the feedback amplifier is also explained. At the later part of the video, the concept of the virtual ground of the op-amp is explained from the feedback amplifier perspective. This video will be helpful to all the students of science and engineering in understanding the concept of the negative feedback in the amplifiers, and the effect of negative feedback on amplifier. #allaboutelectronics #analogelectronics #feedback #feedbackamplifier Support the channel through membership program: https://www.youtube.com/channel/UCBkOVp1Cqz4MR0LYR8vKpZg/join Follow my second channel: https://www.youtube.com/channel/UCGA2TO8ylVqFHpucwn_6Jlw Follow me on WhatsApp channel: https://www.whatsapp.com/channel/0029VaLeZrfAO7RDoKr7je0l Follow me on Facebook: https://www.facebook.com/ALLABOUTELECRONICS/ Follow me on Instagram: https://www.instagram.com/all_about.electronics/ Music Credit: http://www.bensound.com$