What is the effect of EMI and EMC in PCB design? and how I can remove it?
441965
Its an art to remove it. What it is, is a PCB radiating EMI above certain levels (depends on what you are testing for, FCC class A, B, etc...). Filtering power inputs is a good start, also any other data lines entering or leaving can act as an antenna and radiate EMI. Filtering is also recommended.
1064592
hey just take a copper plate specially available in the market for PCBs. Then using a marker draw the circuit u require on the copper plate..then dip the plate in FeCl3 solution...after u take out the plate frm thr sol. only the copper under the marker will be left n i.e. ur circuit..then using bit drill make holes in the board for inserting the component wires into the board after this solder the componenets..
1125096
Check RF cafe and quizzes under the site map. Also check out the free tests on ETA international these are geared for electronic technicians but should give a good review of fundamental electronic components. \n\nEnjoy.
12356
Sounds like static electricty, which tends to develop in windy dry conditions.  Check it out.
975863
Connection? or disconnection...\n\nSemiconductors are not metals - nor do they intend to be.
88548
Try theese sites\n\nhttp://www.web-ee.com/primers/Tutorials.htm\nhttp://www.maintenanceresources.com/productsshowcase/productlisting/electronicspage.htm\nhttp://class.ee.iastate.edu/rmander/ee201rma/
933105
Take precautions against static electricity, especially when you open the box or handle the chip.  Mild static damage can ruin miniature electronics like chips easily.  If you felt the shock, it was probably enough to ruin it right away, more mild damage should show up within six months.\n\nYou've probably learned the static rules, then forgotten bits.  I know I have.  Here's a refresher. http://www.webopedia.com/DidYouKnow/Computer_Science/2002/static.asp
1152180
This also happens to my speakers, ever since I moved to my new apartment.  It is radio frequency interference and apparently it is caused by nearby antennas or something like it.  IT can happen to any household speakers and even cell phones.
183707
Follow the bottom 2 links that I am going to post to get a labeled schematics\n\nhttp://www.kids-online.net/learn/click/details/sblvalpci.jpg\n\nhttp://dmzweb4.europe.creative.com/wwimages/audio_int/sblive/liveplayerconnect600.gif
633158
The chips are usually soldered in place on a printed circuit board, and the odds that you could desolder them without grounding or shorting any pins are small indeed. That makes the answer to this question almost positively no, the data will not remain.
508840
Electro-Magnetic Interference (EMI) and Electro-Magnetic Compatibility (EMC).\n\nThe terms refer to the specifications and tests used to ensure that each component/box/system does not degrade the performance of other components/boxes/systems in a particular design due to the electromagnetic energy being emitted.
473172
You've actually got several concepts and questions merged together.\n\nWhen you ask "how does the aerial setup the waves from only the ac signal?"  I assume you're asking how any DC components of the signal get filtered out?\n\nA transverse electromagnetic wave involves both a VARYING electric field and a VARYING magnetic field, appearing at right angles to each other and to the direction of travel of the wave.\n\nAny DC component has no varying component, therefore, no wave is generated.  Although DC flowing through a wire creates electric and magnetic fields, no wave is generated because there is no variance in the fields.  \n\nThere are other electronics concepts that require the changing electromagnetic fields of AC to work.  A transformer uses AC, not DC.  A capacitor will block DC signals, but allow AC signals to pass.\n\nAlso, as you indicated, an efficient antenna has a matched impedance to the signal source in order to maximize the amount of engergy propagated by the antenna in the desired direction(s).
508404
Use a darlington array. They make them with 6 or more darlington transistors on a single chip. Some even have the circuit protection diodes built in. These are perfect for stepper motor control circuits. If you don't want to buy them, you can probably scavenge a couple from a dead printer or copier, if you can get one.\n\nOther than that, there is no best transistor. This is a general, low speed switching application, and almost any transistor that can handle 160mA at your circuit's voltage can be made to work with the proper biasing. But a single chip to replace several transistors and diodes will simplify your PCB.
358308
Try this site:\n\nhttp://www.emc.com/products/systems/DMX_series.jsp
634155
You can do what they do for airliners to protect them for radio interference.  Since an EMP is just a very concentrated radio wave this should work.  Take some tin mesh and wrap it around the electronic device you wish to protect.  This will create a great barrier because it causes the radio wave to be absorbed by it, with no damage to the electronics inside it.
655524
http://en.wikipedia.org/wiki/Magnetic_Flux_Leakage\nThis is real good
448481
The concept is to build an electromagnet that cuts the circuit when energised. This produce a buzzing effect