Skyworth Incoming Smart Projector: Reflective Ultra-Short Coke Skyworth D1 has started Jingdong pre-sale
Skyworth D1 smart projector body is very small, the whole size of only 22.7 × 23.7 × 7.6cm, will not take up too much space in the home. The shape design of the machine is very good, the whole machine is round, and the magnesium alloy panel surrounds the body, which shows a full sense of science and technology. Behind the fuselage is the interface design, there is a USB3.0, a USB2.0 and an HDMI interface, users can access more peripheral devices. At the bottom of the fuselage is a metal mesh heat vent, large area of ​​the heat vent can quickly emit heat to the body to reduce the burden on the body.
In the system, Skyworth D1 smart projector is equipped with Skyworth πOS system. This system is based on the Android operating system optimized depth, support the installation of third-party software such as sofa butler to expand content resources, while operating more humane. Relying on the rich resources of Skyworth Box, Skyworth D1 Smart Projector aggregates many popular resources such as Tencent Video, Sohu Video, and Iqiyi Video. The viewing content is very rich and suitable for people of all ages in the family to watch and use.
It is worth saying that the Skyworth D1 smart projector supports the artificial intelligence voice system. Press and hold the above voice key on the remote control. Say your needs for it. The system will respond quickly to you and find relevant resources for you to complete. Instruction operation, this is very practical for the elderly and children in the family.
Skyworth D1 smart projector is a more practical home entertainment products, all aspects of performance are very good, its market reference price is 3999 yuan, is currently in the Jingdong Mall for pre-sale, interested friends can choose to start.
Smart TV/box information can focus on smart TV information network sofa butler (http://), China's influential TV box and smart TV website, providing information, communication, TV boxes, smart TVs, smart TV software, etc. Answering questions.
4 Layer PCB
4 Layer PCB
What is 4 layer PCB?
Four-layer circuit board is a kind of printed circuit board. It is made of four layers of glass fibre, which can reduce the cost of PCB.
Compared with Double Sided PCB, multi-layer PCB have many advantages. They can be designed more compactly. They can greatly improve noise resistance and make layout easier.
There are also great differences between the 2-layer and 4-layer PCB. For details, please click: What's the difference between 2 layer and 4 layer PCBs?
4 layer PCB stackup and thickness
4 layer PCB stackup include two inner layers, inner layer 1 and 2, are sandwiched between the top and bottom layers. From top to bottom, the 4-layer PCB stackup like below ,The top, i.e. the signal layer (0.0014 in. width) is followed by a prepreg layer with a thickness of 0.0091 in. and dielectric constant of 4.2. The top layer is copper material. The prepreg layer is followed by inner layer 1 (0.0014 in.), referred to as the plane. A core sublayer is part of inner layer 1, which has a width of 0.037 in. This is followed by inner layer 2, which is another plane layer made with 1 oz. copper and is 0.0014 in. thick. Another prepreg sublayer constituting two sheets that are 0.0091 in. thick forms part of inner layer 2. The final layer, the bottom layer, is also 0.0014 in. thick, and is a signal layer as well. Interconnects are soldered and placed on the top and bottom layers.
4-layer PCB has two stacking forms
The standard 4-layer PCB stack is shown below, and GND and VCC can be switched according to the layer with more signals.
If you don't want to connect all the ground pins through the hole, there will be different stacks and wide power routing on the signal plane.
For the following reasons, this may be a better stack to use a four-layer PCB:
- The signal layer is adjacent to the plane. The signal running on the reference plane (whose voltage is exactly at the VCC) will still return on the reference plane.
- Signal layers are tightly coupled to their adjacent planes.
- The ground surface can be used as a shield for the internal signal layer. You will get better results, so that your plane height is as low as possible.
- Multiple grounding layers reduce the grounding (reference plane) impedance of PCB and common mode radiation.
When the high-speed signal changes the reference plane, there should be a nearby path for its return current to move between the two reference planes. Using two horizons, you can do this by connecting two planes directly to a single channel. For grounding and power layers, the connection must be made through capacitors, which usually require two through-holes and one capacitor. This means worse signal integrity and more circuit board occupancy. On the other hand, having a power plane can reduce the voltage drop on the power rail, thereby releasing the space on the signal layer.
PCB Board Thickness
4 LAYER 0.8 MM STANDARD BUILD
4 LAYER 1.6 MM STANDARD BUILD
0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.6mm, 2.0mm, 2.4mm, Please contact us if your board exceeds these.
4 layer PCB Prototype
4-layer circuit board prototyping refers to the trial production of printed circuit boards before mass production. It is mainly used for electronic engineers to design circuits and complete PCB Layout, then to carry out small-scale trial production process to the factory, that is, proofing PCB. The production quantity of four-ply proofing generally has no specific boundaries. Generally, engineers call it proofing before product design has not been confirmed and test has been completed.
Notices for proofing of four-layer circuit boards
The precautions for the production of four-layer PCB samples generally include two groups, one is the Engineer group, the other is the PCB sample manufacturer.
As a group of engineers, the matters needing attention in proofing are as follows:
1. Choose proofing quantity carefully to control cost effectively.
2. Specially confirm device packaging to avoid proofing failure due to packaging errors.
3. Conduct comprehensive electrical inspection to improve the electrical performance of PCB board.
4. Make good signal integrity layout, reduce noise and improve PCB stability.
As a manufacturer of four-layer circuit boards, the precautions are as follows:
1. Check PCB files carefully to avoid data problems.
2. Conduct process approval in an all-round way and process configuration with self-manufacturer.
3. Control production quantity, reduce cost and maintain quality.
4. Communicate with customers who need samples to prevent accidents in advance.
4 layer PCB price and cost
We specialize in Quick Turn PCB services with an industry leading turnaround time as fast as 24 hours. Three low-cost options for a small number of PCB prototyping needs. At the same time, we also provided Flexible PCB , Rigid-Flex PCB, Metal Core PCB, High-TG PCB, Aluminum PCB , PCB Stencils, PCB Assembly Services and so on. Using the same high-tech equipment as our full-service PCB, it can be manufactured quickly and with virtually no limits.
Cost of four layer PCB is higher than double sided PCB because of complexity of design and higher sensitivity. The better quality of signals, achieved by reducing distortion and propagation levels, is also a factor. Because of the higher levels of signal integrity and reduced interference levels, more manufacturers prefer four layer PCB.
4 layer PCB manufacturing
We provide a full range of PCB functions to meet all your PCB needs. At present, we accept five PCB file formats (gerber file,.Pcb,.Pcbdoc.cam or.brd file format) for PCB manufacturing. But if you design a circuit board using Sprint-Layout software, you can send the. LAy6 file to us to manually generate the Gerber file.
JingHongyi PCB can provide you with multi-layer PCB board that meets RoHS standard. With laminated material, it can match high temperature in assembly process. It is important to remember that some lead-free assembly processes will require laminated substrates to withstand temperatures exceeding 260 degrees Celsius or 500 degrees Fahrenheit over a longer period of time. To solve this problem, we have high temperature laminates in stock, so that our customers can meet the higher temperature cycle requirements of some lead-free assembly applications.
Min. Order Quantity: 1 pcs
Material: FR-4
Finished Copper: 1oz/2oz/3oz(35μm/70μm/105μm)
Inner Layer Copper Thickness:1oz/1.5oz(35μm/50μm)
Silkscreen: White, Black, None
Surface Finishing: HASL with lead, HASL lead free, Immersion gold, Hard Gold ,OSP...
Shape: Custom Shape
100% Quality control
When making circuit boards, and after they are finished, we will test and inspect them strictly to ensure that the product reaches 100% eligibility rate. Preferential prices and higher quality have always been our constant pursuit:
- E-test
- AOI - Testing (Automatic Optical Detection)
- X-ray (check multi-layer registration accuracy)
- CCD-camera controlled drilling
- Impedance control
Videos for 4 layer PCB design and manufacturing
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JingHongYi PCB (HK) Co., Limited , https://www.pcbjhy.com