PCBWay Nov 21,2013 2295

PCB assembly enters reflow process

Since the introduction of automated PCB assembly and component lead soldering, wave soldering has been the mainstream method of applying solder automatically to the bottom The PCB is passed though the...

PCB assembly enters reflow process

PCBWay Nov 21,2013 1207

Re-flow Soldering Process

Reflow soldering is the making of solder joints by (re) melting previously applied solder, usually in the form of a paste. A re-flow machine is a conveyorised oven that transports the pasted and compo...

Re-flow Soldering Process

PCBWay Nov 21,2013 1234

Single Sided Surface Mount PCB Assembly

Single sided PCB assembly requires components to be assembled on only one side of the circuit board and is the least complex of PCB surface mount assembly processes. Double sided and variants of surfa...

Single Sided Surface Mount PCB Assembly

PCBWay Nov 21,2013 2056

Solder Pasting and Printing (surface mount process)

To achieve accurate positioning of components, surface mount assembly PCBs must be designed to ensure that component pad (land pattern) dimensions and layout are in accordance with good practice and t...

Solder Pasting and Printing

PCBWay Nov 21,2013 2803

Component Placement onto the Printed Circuit Board

The best-expected manual insertion rate of through-hole components is 200 to 400 components per hour. Automation has been a prime objective for printed circuit board assemblers since the electronics i...

Component Placement onto the Printed Circuit Board

PCBWay Nov 21,2013 804

Printed Circuit Board Designs

Fundamentally, there are two PCB design systems - through hole and surface mount. In through-hole process, components have connecting pins that are pushed through plated holes (vias) in the PCB and pr...

Printed Circuit Board

PCBWay Nov 20,2013 742

Surface-mount circuitry-PCB

Surface-mount circuitry of the PCBs does not require a hole for each component lead. Automated testing, however, may require vias on every node. The holes were never an issue with through-hole circuit...

Surface-mount circuitry-PCB

PCBWay Nov 20,2013 844

Through-Hole Considerations-PCB

The older technology for op amps and other components is through-hole. Components are constructed with leads that insert through holes in the board hence the name. Through-hole components, due to th...

Through-Hole Considerations-PCB

PCBWay Nov 20,2013 10699

PCB Trace-to-Plane Capacitance Formula

For example, if the capacitance formula is applied to the following trace: 4 Layer board signal routing next to ground planeBoard layer thickness: 0.188 mmTrace Width: 0.75 mmTrace Length: 7.5 mm A ...

PCB

PCBWay Nov 20,2013 1105

Trace Reflections-PCBs

Reflections and matching are closely related to loop antenna theory, but different enough to warrant their own discussion. When a PCB trace turns a corner at a 90 angle, a reflection can occur. This i...

Trace Reflections-PCBs

PCBWay Nov 20,2013 903

Board Stack-Up The Order of Layers

There has been a lot of confusion in the past over what is the optimum order for PCB layers. Take, for example, a 4-layer board consisting of two signal layers, a power plane, and a ground plane. Is i...

Board Stack-Up

PCBWay Nov 20,2013 719

Multi-Layer PCBs

Double-sided boards, in spite of their benefits, are not the best method of construction, especially for sensitive or high-speed designs. The most common board thickness is 1.5 mm. This separation is ...

Multi-Layer PCBs

PCBWay Nov 20,2013 831

Single-Sided PCBs

Very simple consumer electronics are sometimes fabricated on single-sided PCBs, keep-ing the raw board material inexpensive (FRC1 or FRC2) with thin copper cladding. These designs frequently include m...

Single-Sided PCBs

PCBWay Nov 20,2013 797

PC Board materials Materials Choosing the Right One for the Application

PC Board materials are available in various grades, as defined by the National Electrical Manufacturers Association (NEMA). It would be very convenient for designers if this organization was closely a...

PC Board materials Materials

PCBWay Nov 20,2013 673

Prototype of the PCBs

Normal design cycles, particularly of large digital boards, dictate layout of the PCB as soon as possible. The digital circuitry has been simulated, but in most cases, the produc-tion PCB itself is th...

PCB

PCBWay Nov 20,2013 828

The PCB is a Component of the Op Amp Design

Op amp circuitry is analog circuitry, and is very different from digital circuitry. It must be partitioned in its own section of the board, using special layout techniques. Pinted circuit board effec...

PCB

PCBWay Nov 20,2013 964

Printed Circuit Boards

A digital logic circuit consists of a collection of interconnected parts. Most parts are integrated circuits, but in practical designs there are usually a number of passive components and connectors. ...

Printed Circuit Boards

PCBWay Nov 20,2013 864

Fast Printed Circuit Board Routing

Even though printed circuit board routing is a venerable problem in computer-aided design, fully automatic routing of densely packed boards remains an elusive goal. In current industry practice, a pro...

Printed Circuit Board

PCBWay Nov 20,2013 1134

Printed-Circuit Board Routing Model

A printed-circuit board is like a multilayer sandwich of routing layers. In general, the current PCB technology offers as many as 30 or more routing layers. Referring to Figure 1, the PGA package and ...

Printed-Circuit Board

PCBWay Nov 20,2013 1064

Circuit Board Routing

With the viewpoint of electronics system design automation, a system design is usually divided into different levels of design processes. The effect of interconnect interface occurs when integrating d...

Circuit Board