The definition of Multilayer PCB
One single layer board has a single layer of conductive material.
Multi-layer boards have multiple layers of conductive material (almost always copper) with insulation between them.
And paths called 'vias' that allow different layers to conduct to each other.
What is multilayer PCB?
You may think this is very stupid question.
But for new PCB comers,What is multilayer PCB is basic question for their work.
Jim want to introduce multilayer PCB compare with single layer PCBs.
Multilayer PCB have different use area
Commonly in cheaper electronics you'll find single or double layer boards,
with expensive high end stuff (like cell phones or computer motherboards) using upwards of 9+ layers.
Multilayer PCB repair more difficult
With a single layer board, the conductive paths ("traces") are on the surface.
If there is an error on the board you can go in with a knife to cut the trace and you can solder wire to the surface traces to patch it to another location.
With a multi-layer board cut and patch is much harder.
Combine that with the cost and you have to be sure to get the multi-layer board right on the first go around.
You can think of the multi-layer board like some complex highway interchanges called stack interchanges.
If you have a couple highways coming together you have to stack bridges up one on the other so that everything can pass through the area.
Related multilayer PCB articles:
Tuesday, March 31, 2015
Wednesday, March 18, 2015
PCB’s need to be tested
PCB’s need to be tested
PCB’s need to be tested after production to ensure they are defect free.
There are 2 testing options to choose from, Flying Probe and Hard Fixture test.
For short runs or prototype boards that will not likely go to production, Flying Probe is a great option to consider as it is less expensive than Hard Fixture.
There are 2 testing options to choose from, Flying Probe and Hard Fixture test.
For short runs or prototype boards that will not likely go to production, Flying Probe is a great option to consider as it is less expensive than Hard Fixture.
PCB's Flying Probe tests introduce
With Flying Probe tests, no fixtures need to be prepared, only data files. Flying Probe tests are able to reveal not only shorts and opens produced during the manufacturing process but have also been known to expose design errors.
PCB's Flying Probe test process
Flying probe tests utilize four to eight test heads, each equipped with a precision probe which moves to test points, vias, component pads and circuit interconnects on both surfaces of the PCB at very high speeds. Boards are first probed to search for “opens”, i.e. broken traces or inadequately plated holes. Then a second pass looks for short circuits “shorts” between nets. These probes are controlled by XYZ servo-systems and can contact pads only a few mils (thousandths of an inch) across and a few mils apart.
Top 3 factors ensure HTD custom prototype PCB quality
Two factors effect custom circuit board printing order
Custom circuit board must list Guarantee to first place
HTD Group 2015 prototype PCB promotion flyer
Sunday, March 1, 2015
PCB stencil biggest features for PCB boards
PCB stencil and PCB board relationship is very close.
Not only due to PCB stencil name.
But also the function of PCB stencil.
About PCB stencil and PCB boards relationship,
Jim want to discuss about below parts:
1,PCB stencil for pcb not only one tool!
2,PCB stencil use way
3,PCB stencil biggest features
So let’s begin to disucss PCB stencil and PCB boards relationshiop.
PCB stencil for pcb not only one tool!
A companion to the Prototype stencil, PCB stencil is the solution for the double sided surface mount assembly you’ve been looking for.
PCB stencil use way
The PCB stencil utilizes the alignment brackets supplied with the prototype stencil to create a controlled holding area for the board.
PCB stencil biggest features
PCB stencil also features cut outs to create clearance for components that are already loaded on the opposite side of the board, creating a level printing surface for the secondary side of the board.
Related to stencil for PCB post:
Most important PCB stencil design is layout defined
You must know Inexperienced PCB stencil design Introduce
pcb stencil printer
http://www.chinastencil.com/pcb-stencil-printer-not-only-stencil-making-equipment.html
pcb stencil design
http://www.chinastencil.com/top-4-pcb-stencils-design-factors.html
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