Who invented PCB?
The creator of PCB was the Austrian Paul Eisler, who first used printed circuit boards in radios in 1936. In 1943, Americans mostly used this technology in military radios, and in 1948, the United States officially recognized this invention for commercial use. Printed circuit boards have only been widely used since the mid-1950s.
PCBs are ubiquitous and are widely used in communications, medical, industrial control, automotive, military, aviation, aerospace, consumer and other industries. In all kinds of electronic products, PCB, as the main component of product hardware, plays an indispensable and important role.
Why are PCBs 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 board itself is brown, and the green we see is the solder mask. Solder mask is not necessarily green, there are red, yellow, blue, purple, black, etc., but green is the most common.
1) Green is less irritating to the eyes. The teacher told us from a young age that green is good for the eyes, protects the eyes, and resists 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 changing lines.
3) When the board is soldered by SMT, it needs to go through tinning and patching and the final AOI verification. These processes all need to be calibrated by optical positioning. The green background color is better for the recognition effect of the instrument.
How are PCBs 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, Mentor EE, Mentor Pads, 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 considers various challenges brought by high speed and high density.
The basic process of PCB design is: preliminary preparation → PCB structure design → PCB layout design → PCB constraint setting and wiring design → wiring optimization and silk screen placement → network DRC inspection and structure inspection → PCB board making.
What are the white printed lines on the PCB?
We often see white silkcreen on PCBs, have you ever wondered what they are? These white silkcreen are actually used to mark components and print important PCB information on the board, called "silkcreen printing". It can be silkcreen printed on a board or printed on a PCB with an inkjet printer.
What are the components on the PCB? There are many individual components on a PCB, each of which has a different function, which together constitute the overall function of the PCB. Components on a 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 require wires to be connected. There are no wires in the PCB, instead copper traces are used to carry the current throughout the device and connect all the components.
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