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Have you noticed that now more and more of our lighting is using led lighting.What is LED? Compared to the traditional light bulbs, LEDs have lower power consumption, longer lifetime and higher energy efficiency. In the PCB industry,when we say LED PCB, it refers to the pcb used for LED lighting, if you are looking for a suitable LED PCB for your lighting system, this article may bring you something. WHAT ARE LEDS COMPOSED OF?LED is an initial light-emitting diode that produces light when an electric current passes through. LEDs typically have negative and positive electrodes, which generate light in the visible light region.The LEDS are glued to the PCB by soldering process and have electrical connections for lighting.Since light-emitting diodes dissipate a lot of heat when they are in use, when you are designing LED, the metal core is usually the best choice for LED PCB, it is because that it dissipates heat more faster. Among them, the metal material aluminum is the most widely used
The high degree of customization is the most important characteristic of PCBs. There are significant differences in the usage scenarios, products, performance, materials, areas, and other aspects of PCBs, resulting in significant changes in the types of components used, the thickness of connecting wires, and the density of wiring. This requires PCB companies to have strong customized production capabilities. Although the PCB industry has some common basic processes, the most important thing is to determine different production processes and equipment based on the accuracy requirements of substrate thickness and material, line width and distance, design structure and production scale, as well as other specific requirements specified by customers, resulting in significant differences in production prices. So, do you know what the cost components of PCB circuit boards are? The production process of PCB is relatively complicated, usually involving more than 40 processes such as inner
1. One side adopts red glue technology, and the other side adopts solder paste technology This method is suitable for PCB boards with dense components and different sizes of components on one side. Especially when the gravity of large components is high, there will be detachment phenomenon after reflow soldering, and at this time, the red glue will become more firm when exposed to heat. The process flow is as follows: incoming material inspection -->A-side screen printing solder paste on PCB -->SMT -->AOI or QC inspection -->A-side reflow soldering -->flip board -->B-side screen printing red glue or dot red glue on PCB (note that both dot red glue and dot red glue apply to the middle part of the component, and do not let the red glue contaminate the solder pad, causing the component feet to not solder) -->SMT -->drying -->cleaning -->testing -->repair. It should be noted that the solder paste surface must be welded first before drying the red adhesive surface. Because the drying t
Wave soldering is a batch soldering process used for manufacturing PCBs. The basic equipment used in this process is to move PCB through conveyors in different areas, solder trays used in the welding process, pumps that generate actual waves, and spray and preheating pads for flux. Solder is usually a mixture of metals. Wave soldering is mainly used for welding through hole components. 1. There is green oil inside the component hole, which leads to poor tin plating inside the hole. The green oil in the hole should not exceed 10% of the hole wall, and the number of holes in the internal green oil should not exceed 5%. 2. Insufficient coating thickness leads to poor tin plating in the hole. 3. The coating thickness on the component hole wall is insufficient, resulting in poor tin plating inside the hole. For example, copper thickness, tin thickness, gold thickness, etc. Usually, the thickness of the hole wall should be greater than 18 μ M. 4. The hole wall is too rough, resulting
What matters do customers need to explain to the PCB sampling manufacturer when submitting PCB sampling orders? Next, let the editor tell you. 1. Material: Describe the manufacturing material used for PCB proofing, the most common being FR4, which is mainly epoxy resin peeled fiber cloth board. 2. Board layer: Indicate the number of layers made. 3. Resistance welding color: There are many colors available, which can be selected according to your own requirements, usually green. 4. Silk screen color: The font and border color of the silk screen on the PCB board are generally selected as white. 5. Copper thickness: The thickness of copper is generally scientifically calculated based on the current of the PCB circuit, and generally the thicker the better, but the cost will be higher. 6. Is the through-hole covered with solder mask: solder mask is used to insulate the through-hole, otherwise it will cause the through-hole to become uninsulated. 7. Surface coating: with tin spray
There are many factors that contribute to the price of PCB samples, and it is difficult for new salespeople to quote a standardized price without understanding the factors that contribute to PCB price composition. So, what are the components of PCB quotation? 1. Urgent or not For customers with tight delivery requirements, they can apply for expedited order service. For general single and double sided boards that require 12 hours of expedited delivery, PCB sampling manufacturers may charge an expedited fee of approximately 800 yuan. 2. Invoice fees Some customers' companies have very formal financial procedures, so they need to provide invoices for every PCB procurement project, and invoicing is subject to taxation. Therefore, PCB sampling manufacturers generally add this invoice tax to the PCB sampling price. 3. Express delivery fees Generally, customers with long-term cooperation and relatively close geographical locations will be delivered free of charge by drivers appoint
PCB sampling refers to the production of a small quantity of PCB samples for functional debugging before starting mass production of circuit boards; After the functional debugging is completed, subsequent batch production can be carried out, which can avoid production risks and reduce losses caused by product errors. There are two methods for PCB sampling, namely formal PCB factory sampling and professional sample company sampling. So, what are the differences between the two types of sampling? Next, let the editor tell you. 1. The purpose of regular PCB factory sampling is to have bulk orders and hope that customers can have a return order; Professional sample companies themselves only produce samples or small batches, and if there are large orders, they generally cannot do so. 2. In terms of quality assurance, it is certain that regular PCB factories do better than professional sample companies. Professional sample companies usually charge for samples upon delivery, do not eve
High frequency circuit board refers to a special type of circuit board with high electromagnetic frequency, used for PCBs in the fields of high frequency (frequency greater than 300MHz or wavelength less than 1 meter) and microwave (frequency greater than 3GHz or wavelength less than 0.1 meter). It is a circuit board produced using ordinary rigid circuit board manufacturing methods or special processing methods on microwave substrate copper clad board. Generally speaking, high-frequency boards can be defined as circuit boards with frequencies above 1GHz. High frequency circuit boards are one of the high difficulty boards, so what are the requirements for making high frequency circuit boards? 1、 Drilling 1. The drilling feed speed should be slow, with a speed of 180/S. A new drilling nozzle should be used, with aluminum plates placed on top and bottom. It is best to drill with a single PNL, and the hole should not be exposed to water; 2. The ground plate copper sinking circuit i
The product quality of circuit boards is produced, not inspected. Only by strictly following the production process and operation instructions at every stage of the production process can the quality of the products be guaranteed. Therefore, in the production of PCB circuit board products, circuit board manufacturers must do the following 8 points: Firstly, establishing the awareness that quality is the lifeblood of an enterprise To recognize: poor product quality; Products have no market, products have no market, and enterprises lose their source of profit. Of course, for companies, even if the product market is good, they should "be prepared for danger", improve product quality, and create a better corporate reputation. Secondly, establish a customer awareness of quality Everything is customer-centric, treating oneself as the customer, the operator of the next process, and the consumer of the product. If you cut corners in your work, it will harm your personal interests. Thi
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