Seektronics

0 ohm resistor, also known as a bridge resistor, is a special purpose resistor. 0 ohm resistor is a resistor with a very small resistance value, rather than zero resistance value. Two points in the design of the circuit board can not be connected with the printed circuit, often in the front with cross line connection, which is often seen in the ordinary board, in order to make the automatic chip machine and automatic insert machine work normally, with zero resistance instead of cross line. 0 Ohm resistor for span lines on single sided PCBs   A summary of the role of the 0 ohm resistor can include the following: l  No function in the circuit, just on the PCB for debugging convenience or compatible design, etc. l  Can be used as a jumper to avoid high frequency interference (becoming an antenna) caused by using jumpers. l  When the parameters of the matching circuit are uncertain, 0 ohm is used to replace them. In the actual debugging, the parameters are determined and then the specific

In general, the system is always composed of multiple subsystems, which in turn are composed of smaller subsystems, until the subsystems are subdivided into a complex combination of resistors, capacitors, inductors, transistors, integrated circuits, mechanical parts, and other small components, any one of which will be the cause of the system failure. Therefore, the hardware reliability design should consider both the reliability design of a single control unit and the reliability design of the entire control system based on ensuring the reliability of the components.   1. Factors affecting hardware reliability   (1) Component failure.  There are three kinds of component failure: one is the defect of the component itself, such as silicon crack, air leakage, etc.; the second is the processing process, environmental conditions change to accelerate the failure of components and assemblies; the third is the process problems, such as poor welding, screening, etc.   (2) Improper design.  In

1. Let purchasers find manufacturers to provide specifications, safety information, environmental protection information, insurance information - E-document 2. Verify that the information is true and complete, such as the applicable period of the document, so as not to be fooled by the manufacturer. 3. Let the buyer find the manufacturer to provide samples, specifications, safety information, environmental information, insurance information - Paper files 4. Environmental test: send several samples to the environmental laboratory for ROSH halogen test. 5. Electrical specifications and high-temperature testing - e.g. electrolytic capacitors :  A: measuring capacity and deviation withstand voltage, PIN foot tin is good B: go through the production line to see if the capacitors are deformed after the high temperature of the furnace and if the capacity and the deviation voltage are okay. 6. Body size check - e.g. electrolytic capacitors . Body height and diameter, PIN pin spacing, PIN pin d

Many people have encountered the situation of being rejected for small quantities when asking about SMT, and most of the reasons given for the rejection are "small quantities are not cost-effective" and " High  start-up losses". What are the so-called losses? Before SMT processing, you need to do the same preliminary work as when you receive a large order, such as SMT machine programming, PCB positioning, start the first piece of confirmation of this type. In the case of a small amount, the so-called loss, more is the loss of time. Because in the same time, the production efficiency of SMT with large processing volume is higher, so as not to waste time on the preliminary work after a morning or a day of production. And in the machine in and out of the time, so we prefer to receive the kind of area is not very large, but the patch point is very concentrated, so that both high efficiency, but also greatly save a variety of labor costs, machine losses, etc.   To quote

In the process of purchasing electronic components, the most worrying thing for buyers is not the price, but the quality of the product. There are a variety of IC chips on the market, of all kinds, and without paying attention to the distinction, it is sometimes difficult to see the difference between various materials, whether it is true or false, new or refurbished. The following is a compilation of some methods to identify genuine and fake chips, for your reference. Common chip counterfeiting methods Material A counterfeit material A Original manufacturer's tailor loose material: the original packaging has been disassembled or is no longer available, but product functionality and yield may be lower due to storage time or handling process, etc. Original manufacturer scrap or defective products: mainly products that have not passed factory inspection by the original manufacturer, such as scrap products after reliability testing, poor packaging quality, bad test products, etc. Orig