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PCB circuit design bead selection techniques

Monday, July 25, 2016 11:51:15 AM Asia/Shanghai

PCB circuit design bead selection techniques

  Chip beads and chip inductors using reason: the use of chip beads or chip inductors mainly lies in the application. In the resonant circuit requires the use of chip inductors. And when you need to eliminate unwanted EMI noise, the use of chip beads is the best option.

       1. Beads in ohms instead of Hunter, it should pay special attention. Because the bead unit is in accordance with its impedance at a frequency generator to the nominal impedance of the unit is ohm. The beads DATASHEET typically provide frequency and impedance characteristic curve, generally 100MHz as standard, such as 1000R 100MHz, meaning that when the magnetic beads 100MHz frequency impedance is equivalent to 600 ohms.

       2. Common filter is lossless reactance element constituted, its role in the line is the stop-band frequency signal reflected back to the source, so this type of filter is called reflection filter. When the reflection filter does not match the source impedance, there will be a part of the energy is reflected back to the source, resulting in enhancement of the level of interference. To address this malady can be used in the filter into the online ferrite bead or beads sets, use mayonnaise or ring bead on the high-frequency signal of eddy current losses, the high-frequency component is converted to heat loss. Therefore, magnetic beads and high frequency components actually play absorption, it is sometimes also referred to as absorbent filter.

       Different ferrite suppression components have different optimal inhibition frequency range. Typically the higher the permeability, the lower the frequency of inhibition. In addition, the greater the volume of the ferrite, the better the inhibition effect. I love some of the online program, Daniel found: in a certain volume, the long, thin shape than the stubby suppressing effect, the smaller the diameter the better inhibitory effect. But in the case of AC or DC bias current situation, there is also the problem of saturation of ferrite to suppress the larger cross-sectional component, the more difficult and saturated, can withstand greater the drift. When EMI absorption ring / bead differential mode interference suppression, through its current value is proportional to its volume, both disorders causing saturation, reducing the device performance; common mode interference suppression, the power of the two wires (positive and negative) while passing through a magnetic ring, valid signal differential mode

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Posted in PCB Technology By judy judy

The Evolution of Printed Circuit Board Finishes

Wednesday, June 29, 2016 9:15:28 AM Asia/Shanghai

The surface you choose to use on your printed circuit board is actually the most important decision you will make. This finish will make all the difference when it comes down to the reliability of the product, the quality, the manufacturability, and of course, the cost.

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Posted in PCB Technology By Alice Alice

Instructions for providing the required files for PCB assembly

Wednesday, June 22, 2016 3:25:22 PM Asia/Shanghai

- Bill of Materials - Assembly Drawings - Pick-and-Place file - Gerber files - Additional Product-specific instructions Welcome visit ! More interest pls contact : Skype:raypcb02 Email:sales02@raypcb.com, Wechat:008613714039315Read More
Posted in PCB Technology By judy judy

PCB Mechanical Construction

Wednesday, May 25, 2016 4:50:03 PM Asia/Shanghai

PCB Mechanical Construction

GRADE DESIGNATION MATERIAL/COMMENTS

Noise Sources

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Posted in PCB Technology By judy judy

PCB Layout

Tuesday, May 24, 2016 3:03:31 PM Asia/Shanghai

Circuit Board Layout Techniques

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Posted in PCB Technology By judy judy

Hot Air Solder Leveling(HASL), Rout,Fabrication,Score,Bevel

Friday, May 20, 2016 10:00:13 AM Asia/Shanghai

Hot Air Solder Leveling(HASL), Rout,Fabrication,Score,Bevel

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More interest pls contact :

Skype:raypcb02 

Email:sales02@raypcb.com,

Wechat:008613714039315

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Posted in PCB Technology By judy judy

Low Volume PCB Assembly

Thursday, May 5, 2016 5:28:52 PM Asia/Shanghai

Low volume PCB Assembly means a small quantity of circuit board assemblies (25 to 5000 boards) with DFM and DFT. RayMing offers PCB Turn-Key service in low volumes including PCB fabrication, parts procurement and final assembly.

Design-for-Manufacturing (DFM) should be considered in low volume board assembly. We will review your documentation for any possible Engineering concerns in your Gerber files, BOMs, assembly drawings and circuit diagrams. As a Turn-Key solution provider, we will handle panelizing your PCBs to lower costs and facilitate the assembly process.  We will recommend a solder mask opening to get a high yield rate while preventing solder bridging. We will also thoroughly check your parts list against your PCB files and seek clarification from you before we order parts. This avoids wasting your money and delaying delivery of your boards.

Similarly, Design-for-Testing (DFT) should be involved in your circuit designing job, even for low volume board assembly. Various probe models, fixture styles and tester limitation notes are available to support you. You will have our professional guidelines on how to distribute the test points across the PCB after reviewing your test procedure. We can fulfill your test requirements by following your troubleshooting guidelines, diagnostic tests, and associated documentation to get your boards fully tested.

We have various ways to get your low volume assembly job risk free. In our Turn-Key service, all the printed circuit boards must be electrically tested. A few assembled PCB boards can be sent to you for testing before building the rest. X-ray inspection is available to check BGA and leadless part assembly quality. We are able to resolve any possible assembly issues before shipment.

We take reducing costs seriously for low volume orders. NRE and stencil charges will be waived for repeat orders. We reduce your per-part cost by shopping each part number with the major distributors and choosing quantities to get the lowest per-part price. We have built strong relationships with major suppliers in the USA and other countries to keep part purchasing cost competitive without sacrificing quality. We guarantee that you will get the best combination of PCB Turn-Key service quality, price and delivery.

How to get an official quote before placing your order:

To get a small run PCB assembly quote, email your BOM List and Gerber files to SALES@RAYPCB.COM 

Posted in SMT News By RayMing Technology

how to use lead free solder for PCB assembly and for prototype PCB assembly?

Tuesday, April 26, 2016 4:16:10 PM Asia/Shanghai

Lead free soldering is now a major issue on the agenda of companies manufacturing electronics equipment. Lead is a major constituent of traditional solder and as a result there are concerns over the amount of lead entering the environment. As a result there has been legislation in many areas of the world and a consequent impetus to move to lead free soldering.

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Posted in PCB Technology By sally sally

how to use solder paste and gain the most from the PCB assembly process?

Tuesday, April 26, 2016 3:34:09 PM Asia/Shanghai

Solder paste is a form of solder that is used in PCB assembly, and including prototype PCB assembly, especially when using reflow soldering techniques. The solder paste is a mixture a solder spheres and a specialized form of flux. This means that the solder forms a form of paste that can be printed onto the surface of the printed circuit card in the required There are a number of types of solder paste, but that used for electronics manufacture is a form that can effectively be "printed" onto the surface of the electronic printed circuit board in the required place.

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Posted in PCB Technology By sally sally
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