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Via holes (vias) are provide in a PCB for taking signal traces from one layer to another. So all multi layer PCBs will have via holes. Vias are also provided for supporting and assembling through hole devices or connectors.
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How is a circuit board made in a school workshop?
You'll need a design, which you'll transfer onto a circuit board "blank" which has copper foil covering it completely (one side, or, maybe, two). With the design transferred to the board, you'll coat it with an etch-resistant material. The "resist" will cover the circuit pathways you want to keep, and the etch will remove the rest of the copper. Etching done, rinse, and then apply a solvent to remove the "resist" and expose the copper. That should be your board. You will have to drill holes in it if you go with through-hole components rather than surface mount. There are some video clips on YouTube on this subject. You'll find a link below. Be careful with the chemicals! They can be nasty! Please! Use, store and dispose of them properly. Thanks.
What are the holes on an outlet for?
The holes on the back are there for quick wiring. You strip the wire and then insert it into the holes. It is held in place by spring tension. I do not recommend you wire the outlet by using these holes. From my experience the wires are not secure enough. Strip the wire and wrap it around the screws and tighten it securely which is what all the good electricians I know do. Takes a little longer but IMO it is more secure.
Why 2 holes are drilled oppositely in disc of energy meter?
To over come creeping effect on no-load, 2 holes are drilled on the opposite sides of the spindle. This causes sufficient distortion of the field to prevent rotation when one of the holes comes under one of the poles of the shunt magnet. Courtesy - Industrial Instrumentation and Control
Anode current in an thyristor is made up of?
Holes and electrons
How does motion of electron in n type substance differes from motion of hole in p type substance?
Electrons constitute electronic current in n-type substance and holes constitute conventional current in p-type substance.The motion of electron in a n-type substance is opposite to that of holes in a p-type substance.
What is a printed circuit board?
A printed circuit board is basically used to mechanically support while at the same time electrically connecting electronic components by using conductive pathways. The process is very simple.motherboard is a printed circuit ,where all components of the system is connected.Printed circuit boards are used in nearly all electronic devices.The conducting wires that connect all the components, are printed onto an insulating plastic material such as paxolin or fiberglass. These tracks are commonly made of thin copper sheet stuck to the board. The tracks are then printed using light and a chemical process to remove the unwanted copper.Some boards used in remote controls and wafer thin boards used in ipods etc, are commonly printed, using conductive ink containing silver or carbon.The alternative to printed circuits was to idividually wire the coponents using wire and solder tags. Old tube radios were originally wired this way, but had to be made by hand.Printed circuits allow for automation and mass soldering using a float soldering process on a bed of molten solder.
How do they make radios?
Most radios begin with a printed circuit board- metallic copper printed onto a fiberglass board- this will be most of the wiring. A computer controlled machine "stuffs" the holes in the circuit board with transistors, capacitors and resistors, and they are all soldered in place at one time.
Relief holes are provided in sine bar?
Relief holes are provided for easy handling of sine bar and for reducing the weight of the sine bar.
What is the SMD IC?
Surface-mount technology (SMT) is a method for constructing electronic circuits in which the components are mounted directly onto the surface of printed circuit boards (PCBs). An electronic device so made is called a surface-mount device (SMD). In the industry it has largely replaced the through-hole technology construction method of fitting components with wire leads into holes in the circuit board. Both technologies can be used on the same board for components not suited to surface mounting such as transformers and heat-sinked power semiconductors.
Why holes are provided to sine bar?
To reduce the weight
What is number two lumber?
#2 lumber is the low end 1x boards. They will have knot holes and splits.
Why relief holes are provided in sine bar?
Relief holes are provided for easy handling of sine bar and for reducing the weight of the sine bar.
What are cribbage boards traditionally made of?
Traditionally cribbage boards are made from wood with a series of holes of drilled though them. Usually they are made from a type of hard wood material like oak.
How can you repair the knotholes on your deck?
The best way to repair knot holes in your desk is to remove the damaged boards. New boards guarantee the problem will be resolved and can eliminate more costly repairs down the road.
What is the difference between Integrated Circuits and Printed Circuit Boards?
to the man in the street: An integrated circuit is something like an eprom ( a small unit like a chunk of chocolate) that is usually soldered onto a circuit board. A printed circuit board is a slab of board with holes in it. (like a smaller version of a pegboard) that has lines of copper or similar printed on it for the purpose of connecting all the integrated circuits and resisters together. short answer = Size breadboard = insulation with holes where you mount components and run wires to interconnect them printed circuit board= insulator with copper laminated. copper is etched away to leave wires .. sometimes in several lamentations components are soldered into holes drilled in the wires Hybrid module= usually a ceramic insulator with copper laminated wires components in beam lead packages electron beam welded to the copper integrated circuit = the insulator is the substrate usually a diode done over most of the Si wafer in the first diffusion components are built by diffusing different materials in more and more layers packages or carriers 7400 ic dip 1" x 1/2" surface mount 1/4" x 1/8" beam lead .050" x .025" SSI MSI LSI small scale, medium scale, large scale... integration has to do with the color of the light red light 760nm won let you work much smaller than 1 micron... blue light 350Nm maybe 0.5 micron uv perhaps .2micron xrays gamma rays are a bit more difficult to mask and control so electron beams are used for smaller stuff perhaps tunneling electrons can bring it down some. perhaps an order of magnitude breakthrough will give us nanotek
What does SMT mean when talking about electronic circuits?
SMT stands for Surface Mount Technology. It's a way to make a circuit board by placing the parts directly on the circuit board. The board is pre-printed to show exactly where to mount the parts, kind of like a child's puzzle where underneath each piece is a picture of the piece that should go over top of it. SMT has mostly replaced Through-hole Technology, which was where the parts attached to the circuit board using wire leads that would fit through holes in the circuit board.
Do ironing board covers have an effect on ironing?
Most ironing boards are vented. If you do not have a cover on them, the outline of the vent holes will be pressed into your garment.
