October 24, 2023

The principle and application of multilayer pcb board


I. Principles of multilayer pcb boards.

multilayer pcb fabrication with single-sided and double-sided board between the biggest difference is that the enterprise increased the company's internal control power supply layer and grounding layer. Power and ground for the network is mainly routed on the working power layer. pcb multilayer board on each substrate layer on both sides of the development of a conductive metal, and can use some special adhesive will be combined together with the board connection, and the purpose of the existence of insulating structural materials between each board. However, PCB multilayer wiring systems are mainly studied based on social top and bottom layers, supplemented by intermediate wiring layers.

Therefore, PCB factory the design method of multilayer printed circuit boards is basically the same as that of double-sided printed circuit boards. The key is how to optimize the wiring of the internal electrical layer, so that the circuit board wiring is more reasonable. Multi-functional development of inevitable products with large capacity and small size.

PCB is a kind of printed circuit board, so the common PCB is several layers bonded together, each layer has a resin insulating substrate and metal line layer. The most basic PCB is divided into four layers, the top and bottom circuits are functional circuits, arranging the most important circuits and components, and the two middle circuits are the grounding and power supply layers. This has the advantage that the signal lines can be corrected and are better shielded from interference.

Generally, 4 layers are sufficient for PCB operation, so the so-called 6, 8 and 10 layers are actually more circuit layers added to increase the PCB's electrical capacity, i.e. its ability to withstand stress. Therefore, an increase in the number of PCB layers means that more circuits can be designed in-house.

For memory, when is it necessary to increase the number of PCB layers? Based on the above, it is clear that it is when the electrical strength of the PCB is too high. When is the voltage and current of the memory PCB strongest? Gamers who have played with overclocking will know that memory must be pressurized to increase the operating frequency for better performance. So it's not hard to conclude when memory can be used at high frequencies or overclocked.

Advantages of multi-layer PCB boards.

The laminate is smaller and lighter, which makes it ideal for smartphones or computers, or other products that require versatile packaging. There are also some special benefits:.

1. Multi-layer PCBs allow the product to gain more functionality.

High assembly density means the product can extend the life of the board.

3. The structure is simpler when the product does not require multiple connectors on separate PCBs.

4. In the manufacturing development stage students carry out management rigorous testing workflow Q means that high quality, efficient products will be obtained.

The electrical characteristics of multilayer printed circuit boards are faster than single layer printed circuit boards.

6. Depending on the number of layers to be added, multilayer PCBs are usually well suited for both rigid and flexible structures.

Currently the frequency of high-end memory generally starts at 3600 MHz, for safety and electrical stability, 8-layer PCBs are basically standard, some even up to 10. The performance difference between 8-layer and 10-layer PCBs of the same format is negligible for everyday users, but for professional overclocking players, the latter allows them to obtain higher frequencies.

Third, the use of multilayer PCBs.

Many different industries and product information can benefit from the use of multi-layer PCBs and from us, especially because of the durability, functionality and lightweight nature of multi-layer PCBs. Here are some of the products that companies can often use as well as these boards:

Computers

Heart monitors

Fire alarms

GPS and satellite systems

Industrial controls

相關文章:

Do you know what the four layers of a PCB are called?

Protection engineering technology for the use of multilayer circuit boards on PCBs

How do printed multilayer circuit boards work?

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July 13, 2023

Kitchen too hard to clean? Showcasing organic tips for cleaning your kitchen

One of the best, cheapest and most natural ways to clean your kitchen is to use common kitchen items such as salt and water, salt and vinegar, and salt and lemon juice. These methods can clean plates, pots and pans as well as any kitchen items. Think about it, you can clean a room in your house for as little as $15 for a packet of salt, $30 for a bottle of vinegar, and $40 for a packet of baking soda, whereas it would cost you several times as much to buy chemical cleaners for the same sponges & scouring pads amount of use.

[The Wonderful Uses of Vinegar

Vinegar is like an all-purpose cleaner, because vinegar is acetic acid, which can be dissolved in oil, and can easily take away oil stains after wiping. In addition, vinegar can be used to wipe the metal handle on the cabinet can also prevent rust.

1. The treatment of non-stick pan is very simple, do not have to pour the remaining oil into the sink, as long as the cooking is completed so that the grease condensation with paper towels after wiping. If there is still residual grease, just clean it directly with vinegar. Alternatively, you can pour out all the oil in the pan, then sprinkle two cups of salt on the bottom of the pan to completely soak in the oil and wipe with a paper towel.

2. Whenever you clean the outer edges of a skillet or deep fryer, wipe them with a rag soaked in vinegar to quickly remove the oil.

3. Soak a baking tray in the oven in a mixture of two cups of vinegar and one litre of hot water for one hour to remove any residue immediately. If you have metal or aluminium baking trays,eco washing up spongewipe them with a 1:1 mixture of salt and vinegar and then dry them.

4. If you're used to baking in the oven in regular pans, but you're having trouble washing them, mix a cup of apple cider vinegar with three tablespoons of sugar and pour it into the roasting pan after baking, wait for it to cool down, then wash it with hot, soapy water, and then rinse it with clean water. Because sugar can absorb oil, if the sugar is dissolved in water can make the oil easier to dissolve with sugar water.

Rust Removal Tips

Potatoes can prevent rust spots. Sprinkle some salt onnatural luffahalf a potato, and wipe the rusted area with the salt-soaked side of the potato, and the rust spots will naturally disappear. This is because the potato is coated with granular salt, which can be used to rub or friction to produce a sandpaper-like effect that brightens metal objects.

Tips for removing odours

To remove the burnt flavour of onions, peppers or eggs left in a pan, simply wash the pan with vinegar to get rid of the strange smell. The principle is that vinegar can combine with certain chemicals that produce the smell, and after a chemical change, the smell disappears. Maintenance of Small Kitchen Appliances In the kitchen, appliances can easily become greasy from fumes.

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September 17, 2019

小兒皮膚病有哪些症狀

白癜風是一種常見的皮膚疾病,而且皮膚漂白現象。這主要是因為我們皮膚中的黑色素紊亂。發病後,白色斑塊出現在身體的不同部位,可以發生在身體的任何地方。銀屑病常被稱為銀屑病,是一種常見的慢性皮膚病。主要發病年齡以青少年為主。發病後,患者的主要症狀是全身出現粉紅色鱗片。疾病的主要部位是四肢和頭皮。這種皮膚病在冬季最為明顯。

正品鱷膚油能用於、主婦手等問題,天然無添加、不含類固醇、防腐劑、不加香料、人造色素,孕婦幼兒都適用,100%澳洲製造,值得信賴。每日2-3次輕塗於患處,有效消炎殺菌,舒緩紅腫過敏痕癢症狀,更可促肌膚自療癒修復力,萬寧獨賣。

蕁麻疹是一種快速治療皮膚病的方法。它主要是皮膚水腫的症狀。通常情況下,它會愈合一周左右,但很容易會一次又一次的攻擊。濕疹後,患者全身會有不同程度的瘙癢。這種皮膚病的主要原因是濕疹的顏色是淺紅色,由於外部刺激。痤瘡在生活中尤為常見,主要由毛囊和皮脂腺發炎引起,主要見於20歲左右的年輕人。臨床表現以面部病變為特征,如痤瘡、丘疹、膿皰和結節。

嬰兒常見的皮膚病非常多,有癬,傳染性紅斑,水痘,膿皰病,疣,熱痱子,過敏性皮炎,手足口病等皮膚病。遇到這些皮膚疾病後,寶媽誰一定要注意了,千萬不要抱有僥幸心理,應該帶孩子到醫院進行檢查和治療的第一次。

如何預防皮膚病:

1、保持皮膚的清潔衛生: 經常保持皮膚的清潔衛生,這對於預防皮膚病的發生具有一定的意義。通常積極參加體育鍛煉和運動,適度的曬太陽,能增強體質,保持健康的皮膚,提高皮膚的抗病能力。

2、皮脂腺分泌過多所致皮膚病的預防:較常見,如痤瘡、脂溢性皮炎等,應主要控制脂肪、糖類的攝入,少吃辛辣、油炸食物,常用溫水洗患處,避免用手擠捏。

3、瘙癢性皮膚病的預防: 要積極尋找原因,勸戒患者不要搔抓和外用刺激性強的藥物,勿用熱水燙洗,禁食酒類、辛辣刺激的食物,防止皮膚病加重和複發。

4、感染性皮膚病的預防:對於某些感染性皮膚病,如疥瘡、麻風、性傳播疾病、膿皮病、真菌病、皮膚細菌感染等,發現傳染源應及時隔離治療,切斷傳染途徑,早發現、早診斷、早治療,防止接觸傳染。同時,要做好衛生宣傳和教育工作,注重衛生,改變不良衛生習慣,宣傳和教育預防傳染病和流行皮膚病的病人。

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