Who invented the PCB?
The creator of the PCB is the Austrian Paul Eisler, who first used printed circuit boards in radios in 1936. In 1943, Americans mostly applied this technology to military radios. In 1948, the United States officially recognized this invention for commercial use. Printed circuit boards have only been widely used since the mid-1950s.
Why is the PCB green?
If you are careful, you may find that most of the PCBs are green (there are fewer PCBs in black, blue, red, etc.), why is this? In fact, the circuit board itself is brown, and the green we see is Solder mask. The solder mask is not necessarily green, there are red, yellow, blue, purple, black, etc., but green is the most common.
As for why the green solder mask is used, there are mainly the following arguments:
1) Green is less irritating to the eyes. Our teachers have told us since childhood that green is good for the eyes, protects the eyes, and fights fatigue. Production and maintenance personnel are not prone to eye fatigue when staring at the PCB board for a long time, and the damage to the eyes is less.
2) The cost is lower. Since green is the mainstream in the production process, the purchase volume of natural green paint will be larger, and the purchase cost of green paint will be lower than other colors. At the same time, the use of the same color paint in mass production can also reduce the cost of line replacement.
3) When the board is soldered by SMT, it has to go through tinning, patching and final AOI verification. These processes all require optical positioning and calibration. The green background color is better for the identification of the instrument.
How is the PCB designed?
To manufacture a PCB, the layout design of the PCB must first be carried out. PCB design needs to rely on EDA design software tools and platforms, such as Cadence Allegro, MentorEE, MentorPads, Altium Designer, Protel, etc. At present, due to the continuous miniaturization, precision and high speed of electronic products, PCB design not only needs to complete the circuit connection of various components, but also needs to consider various challenges brought about by high speed and high density.
The basic process of PCB design is: preliminary preparation→PCB structural design→PCB layout design→PCB constraint setting and wiring design→wiring optimization and silk screen placement→network DRC inspection and structural inspection→PCB board manufacturing.
What is the white trace on the PCB?
We often see white printed lines on the PCB, have you ever wondered what they are? These white printed lines are actually used to mark components and print important PCB information on the board, called "silk screen printing" . It can be screen printed on the board or printed on the PCB with an inkjet printer.
What are the components on the PCB?
There are many individual components on the PCB, each of which has a different function, and together they constitute the overall function of the PCB. Components on the PCB include resistors, potentiometers, capacitors, inductors, relays, batteries, fuses, transformers, diodes, transistors, LEDs, switches, and more.
Are there any wires on the PCB?
Beginners may not know that PCBs are actually connected without wires. This is interesting because most electrical devices and technologies need to be connected with wires. There are no wires in the PCB, but copper traces are used to guide the current throughout the device and connect all components.
