Teknicircuits

Teknicircuits, printed circuit board, pcb, prototype, printed circuit board fabricator, circuit boards, assembly, multi-layer, pcbs, prototype circuit boards, fast printed circuit boards, quick turn, electronic circuits, low cost circuit boards, custom printed circuit boards, No Touch PCB, NoTouch PCB, HDI circuits, Microelectronics PCB, MilSpec Circuits, Assembly services, printed circuit board design printed circuit board repair printed circuit boards made rak printed circuit boards making printed circuit boards soldering printed circuit boards ipc printed circuit board printed circuit board fabrication 

Didn't find what you were looking for? JUST GOOGLE IT! 
Custom Search
A printed circuit board, or PCB, is used to mechanically support and electrically connect electronic components using conductive pathways, or traces, etched from copper sheets laminated onto a non-conductive substrate. It is also referred to as printed wiring board (PWB) or etched wiring board. A PCB populated with electronic components is a printed circuit assembly (PCA), also known as a printed circuit board assembly (PCBA).

PCBs are rugged, inexpensive, and can be highly reliable. They require much more layout effort and higher initial cost than either wire-wrapped or point-to-point constructed circuits, but are much cheaper and faster for high-volume production. Much of the electronics industry's PCB design, assembly, and quality control needs are set by standards that are published by the IPC organization.

Drilling

Holes through a PCB are typically drilled with tiny drill bits made of solid tungsten carbide. The drilling is performed by automated drilling machines with placement controlled by a drill tape or drill file. These computer-generated files are also called numerically controlled drill (NCD) files or "Excellon files". The drill file describes the location and size of each drilled hole. These holes are often filled with annular rings to create vias. Vias allow the electrical and thermal connection of conductors on opposite sides of the PCB.

When very small vias are required, drilling with mechanical bits is costly because of high rates of wear and breakage. In this case, the vias may be evaporated by lasers. Laser-drilled vias typically have an inferior surface finish inside the hole. These holes are called micro vias.

teknicircuits 
electronic circuit boards 
electronic circuits 
circuit boards 
circuit board
circuit board fabrication and repair 
how to solder multi-layer circuit boards 
laser imaging printed circuit boards 
pcb fabrication 
printed circuit board design 
printed circuit boards usa vendor 
sierra circuits danbury ct 
single layer printed circuit boards usa vendor 
solutions used to attach the copper foil onto the printed circuit 
through hole plating inc 

It is also possible with controlled-depth drilling, laser drilling, or by pre-drilling the individual sheets of the PCB before lamination, to produce holes that connect only some of the copper layers, rather than passing through the entire board. These holes are called blind vias when they connect an internal copper layer to an outer layer, or buried vias when they connect two or more internal copper layers and no outer layers.
The walls of the holes, for boards with 2 or more layers, are plated with copper to form plated-through holes that electrically connect the conducting layers of the PCB. For multilayer boards, those with 4 layers or more, drilling typically produces a smear comprised of the bonding agent in the laminate system. Before the holes can be plated through, this smear must be removed by a chemical de-smear process, or by plasma-etch.

Originally, every electronic component had wire leads, and the PCB had holes drilled for each wire of each component. The components' leads were then passed through the holes and soldered to the PCB trace. This method of assembly is called through-hole construction. In 1949, Moe Abramson and Stanislaus F. Danko of the United States Army Signal Corps developed the Auto-Sembly process in which component leads were inserted into a copper foil interconnection pattern and dip soldered. With the development of board lamination and etching techniques, this concept evolved into the standard printed circuit board fabrication process in use today. Soldering could be done automatically by passing the board over a ripple, or wave, of molten solder in a wave-soldering machine. However, the wires and holes are wasteful since drilling holes is expensive and the protruding wires are merely cut off.

In recent years, the use of surface mount parts has gained popularity as the demand for smaller electronics packaging and greater functionality has grown.

 

Another Website By  World View, Inc.

Questions, Comments, Problems
Contact Web Master
904-247-2865

9-11  NEVER FORGET!! Pearl Harbor  Dec. 7, 1941

Remember "SNEAK ATTACKS' don't just happen, they are planned!

CoastalGa.com  RealEstateInformation.us  WorldGolfVacations.com.com  Nefla.com  RealEstateOnlineUSA.com

printed circuit board design printed circuit board repair printed circuit boards made rak printed circuit boards 
making printed circuit boards soldering printed circuit boards ipc printed circuit board printed circuit board fabrication