KnownPCB provides one stop service from PCB design,PCB fabrication,components sourcing and PCB Assembly including functional test.
Quality is the lifeblood of the company. A full set of the latest production equipment, testing equipment and clean workshop from abroad have been introduced to KnownPCB to improve the updating technical and outstanding quality requirement.
Our products are widely used in communication equipment, industrial control, electrical energy, medical equipment, automotive electronics, intelligent security, consumer electronics, aerospace and other fields.
Thanks to our worldwide clients’support in more than 15 years, KNOWNPCB has established a flexible system platform to enable us develope well and better benefit our clients.
Founded in 2008
More than 800 employees
More than 80000sqm factory size
More than 4,000 famous
Total investment of
RMB 200 million
Our sales and engineers work as three shift to give 24 hours support to different time zone customers
We have more than 15 years' experience working on oversea projects
We manufacture all standard orders in house without outsourcing so we can offer you an extremely competitive price.
We will respond to your enquiries within 2 hours
We accept small quantity & large-scale order started from 1pcs
We offer flexible payment terms from T/T, L/C, Paypal, Western Union to assist your business
The first PCB uses a hole technology, inserts the hole on one side of the circuit board through the lead, and welded the circuit component to the bronze traces on the other side. The board can be single -sided, with an unpopular component side, or a more compact double panel, welded with components on both sides. By bending 90 degrees in the same direction in the same direction, inserting parts into the circuit board (usually a curved lead on the back of the circuit board), can be installed horizontally with two axial leads (such as resistors, capacitors, and diode). Essence Provide boards in the opposite direction to improve the mechanical strength of parts), welded the lead, and trim the end. The lead can be welded manually or welded with a peak welding machine. Tongkou manufacturing increases the cost of the circuit board by requiring accurate drilling, and limits the available wiring area of the signal wiring on the front of the top layer on the top layer of the top layer of th
There are wiring on both sides of Double-Sided Boards. However, to use the wires on both sides, there must be an appropriate circuit connection on both sides. The "bridge" between this circuit is called a guide hole (VIA). The guide hole is a small hole full of metal on PCB, which can be connected to the wires on both sides. Because the area of the double panel is doubled than the single -panel, and because the wiring can be intertwined with each other (it can be around the other side), it is more suitable for more complicated circuits than a single panel. Strictly speaking, double panels are a very important PCB board in the circuit board. His use is very large. Is it easy to watch the PCB board? Make it, the double panel is the extension of one -piece one -piece, which means that the lines of the single -to -surface are not enough to turn to the opposite side. There is also an important feature of the double panel. There is a guide hole. To put it simply, it is double -sided, and
Each trace line is composed of the flat narrow parts of the residual on -carved copper foil. The resistance determined by its width, thickness, and length must be low enough to be carried by the conductor carrier. Power and ground wiring may need to be wider than signal wiring. In the multi -layer board, the entire layer can be mainly solid copper, for ground planes for shielding and power returned. For microwave circuits, transmission cables can be arranged in a plane, such as band lines or micro bands, and their size is carefully controlled to ensure consistent impedance. In radio frequency and fast -switch circuits, the inductance and capacitors of the printing circuit board conductor become an important circuit component, which is usually unwilling; on the contrary, they can be regarded as a conscious part of the circuit design without additional separate components.
Surface installation technology appeared in the 1960s, developed a development momentum in the early 1980s, and was widely used in the mid -1990s. Recetishment of the component to make it have a small metal piece or end cover that can directly weld on the PCB surface, rather than the wire through the hole. The component becomes smaller, and the components on both sides of the circuit board are more common than the installation of the hole, allowing smaller PCB components to have higher circuit density. The surface installation is very suitable for highly automation, reducing labor costs and greatly increasing productivity. The components can be installed on the load. The size and weight of the surface installation element can be one -quarter to one -tenth of the hole components, and the passive component is much cheaper. However, the price of semiconductor surface installation devices (SMD) depends more on the chip itself rather than packaging. Compared with larger packaging, there