Wednesday, September 7, 2022
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Circuit Board Evolution

So, in today’s post, I hope to talk about the transmission of circuit boards from the past to today. So now let’s talk about it.

Awesome Screenshot
Awesome Screenshot

What do they think when they see the picture above? It looks like a mess, right? In the early days of electronic technology, those electronic devices were not atomically connected. Therefore, electronic instruments were connected to each other with conductive materials such as wires or pieces of wire. In that case, the devices were connected to each other with wires from one end to another. That is, “one hundred thousand leads to one hundred thousand.” That’s why this way of making circuits got the name “Point To Pont.”

But when making complex circuits in this way, it was very difficult to find the errors in them. Because when the wires are tangled like this, the head gets confused. But even today, beginner-level people are creating simple-level circuits in this way.
However, to overcome the shortcomings here, the concept of “PCB” was born. Now let’s talk about it…

PCB (Printed Circuit Board)


Due to this PCB technology, which was first introduced during the Second World War, many shortcomings of the previous point-to-point system were avoided.
In this method, conductive copper parts are installed on an insulating plate such as plastic so that electricity can flow. Because the copper strips on the circuit board look printed to us, we call this type of circuit board “Printed Circuit Board -PCB.”

Copper Clad Board

Copper Clad Board

So, a special copper board called “Copper Clad Board” is used to produce PCB boards in this method.

First, we draw the circuit diagram we need on this copper-clad board using a type of ink that does not dissolve in water.
Then holes are made on the board with the drawn circuit diagram as required, and the board is immersed in a ‘ferric chloride’ solution.
Except for the circuit diagram we drew from it, all other copper parts melt. In the end, the paint we applied is removed and cleaned with a liquid-like “Thinner” and used as we need.

This is how a PCB board is made.
So these PCB boards are mainly divided into three parts.

  1. Single Layer PCB
  2. Double Layer PCB
  3. Multilayer PCB

Now let us discuss these PCB types separately.

Single Layer PCB

This is the simplest type of circuit board among PCBs, and this type of circuit board has copper strips on one side only, and the other side includes details and symbols about the devices applied to the board.

Often this type of circuit board is used to build pretty simple circuits. And often, we use only “PTH” type devices to make these circuits.

Double Layer PCB

These types of circuit boards have copper strips on both sides, and both sides contain descriptions and symbols of the devices connected to the board

Generally, these circuit boards are used to build quite complex circuits. Also, both SMD and PTH devices can be easily used for this.

Multilayer PCB

Multilayer PCB

In this type of circuit board, the two sides of the board, as well as the inside, are made of several layers of copper strips.

Generally, these circuit boards are used for building very complex circuits. Also, SMD-type devices are commonly used for these circuit boards, and PTH-type devices are also used. And these circuits are almost completely machine-made.

So the types of circuits produced in this way are included in complex devices such as mobile phones and computer devices.


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