Tuesday, February 5, 2008

Using Virtual Wiring In An Age Of Instant Solutions

The subject of this article is virtual wiring or wires. So what do I mean by virtual? Usually if one wants to connect a digital signal to a relay then one has a circuit which drives the coil, this pulls in the relay contacts and this creates an isolated switch which may be used to provide power to a light or other suitably rated appliance. If the distance between the initiating signal and the appliance is great then one has a choice of either extending the digital signal with a long piece of wire or extending the switch side with long wiring. This seems to be a simple solution but in many cases, extending the wiring may not be the answer if the extension is complex, not aesthetically pleasing or many wires are involved.

The solution is virtual wiring and this can be implemented in a number of different ways.

1) If some wiring already exists then by virtue of multiplexing (combining many signals into one compound signal) and demultiplexing (taking one compound signal and expanding it again into many) electronics on either side, existing wiring can be used if an increase in the number of switches is required without laying extra cable.

2) The mux/demux solution can also be implemented with the use of fiber optics, where the compound signal is transported by means of modulated light.

3) Another transport medium is rf (radio frequency) In this age of Zigbee and other wireless standards, the compound signal can be transmitted through the air without any visible means. The simplest implementation would be a switch (or eight or more) on the near side being closed, detected by the monitoring electronics, assembled into some kind of protocol, transmitted wirelessly, received by the far unit, disassembled and the relevant relay or other switch mechanism would then be toggled. This would allow lights, appliances and other devices to be controlled without the addition of any control wiring.

The natural extension of this type of virtual wiring is to extend analogue signals as well. An example of this could be an appliance/device that needs to be set at a particular value. This value could be read (using a A/D converter) at the near side, assembled and transmitted as described previously and then output to the device in question as an analogue signal (using a D/A converter).

The one drawback of this type of signal extension method is that there will invariably be a delay between switch pushed/signal read and the corresponding action on the far side. Usually however a small delay is acceptable and other high speed methods exist for signals that require a higher bandwidth.

Marc Jarchow
47 year old entrepeneur providing MODular ElecTRONics solutions for the Professional (custom instruments for your business), Educator (can be used as a training aid), Entrepeneur (can be packaged with your logo) and Hobbyist (make your own home based products) using low cost modules to create whatever application you have in mind. This is all done via modetron.com

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Thursday, January 24, 2008

Home Theater Design, Surround Sound Wiring

Home Theater design is not a new idea, but it sure is a growing one! With the prices of large screen displays dropping substantially, the average tv viewing has increased. Many folks now have a reciver for video and a receiver for audio. Not to mention, a DVD player and VHS, high definition, surround sound, sub woofers and even high definition. Quite a jump from the 13" black and white televisions of our past.

Most people are finding that not only have the costs of large screen displays dropped, but so has their audio counterparts. You can now purchase speakers individually, or in a package. Receivers can be used to power the audio from your DVD player, CD player, Satellite or Cable reception or even your FM radio. A good quality "home theater in a box" can be had for as little as $300 now days and will provide an obvious increase in viewing pleasure.

Because of the volume and recent price drops, many people are now taking into account Home Theater Design. "Surround Sound Wiring" is possible the most difficult part. Did you know there are many types of speaker wire that you can use? Speaker Wire can be had in many gauges, shapes, and lengths. You can find Flat Speaker Wire, or Round Speaker Wire. The surround sound wiring you plan to do can make a big difference on what type you chose to use.

If you plan to run your wire through the walls, using a less expensive round speaker wire is fine. The only downfall to running it through the walls is that if you don't plan for it ahead of time, you will find yourself constantly running into unexpected headaches while trying to drill holes and whatnot. However, when it is all said and done a good quality Audio Video Wall Plate will really clean up your project and leave you with a professional finish.

If you still perfer round speaker wire, but don't want to drill, you can now use a special crown molding thats designed to run speaker wire through it. This will allow you to run speaker wire through your entire home theater, exposing a minimum amount of wire. Be warned, however, that this is not cheap. It does provide another benifit though. The beauty of crown molding throughout your home theater will be sure to get attention.

Another option, is flat speaker wire. Invisiwire is just that. You can run it under carpeting or other floor times, or right up your wall. If you run it up the wall, simply paint over it for a camoflauged look. It's not 100% hidden, but it's definately less noticeable and a big help overall. Especially if you aren't comfortable with drilling holes in your wall.

The last thing to consider when you start your surround sound wiring is the location of the speakers. The average 5.1 surround sound setup has 6 speakers. A Center Channel, two front speakers, two rear speakers, and one sub woofer. Because bass is non direction you can locate the sub anywhere. However, there are some suggestions for the remaining 5.

Locate the center where the tv is. preferrably just above it, but if your tv already sits high, than just below it is fine.

The two fronts should be right around ear level (when you are sitting) on either side of the tv. It's okay to move them around a bit to find out exactly how far from the tv you want them. When sounds are buzzing through your room you want to be able to distinguish a difference from dead center to far right, this will make viewing more enjoyable and cinematic.

The rears should be above ear level by 12 to 36 inches. Now that is quite a variable. Most settle in around 24 inches. Again, I would suggest using this as a guide line and moving them around a bit until you find the sound that suits you the best.

"Home Theater Design" and "Surround Sound Wiring" are more of an art than anything. You can buy all the right products, and follow all the guidelines, but when it comes down to it... you need to make sure it fits your viewing habits. With a little practice and some fine tuning, you'll get it just right and you'll never want to change it!

Dustin Twiggs writes articles for www.TCAcables.com, a computer cable site

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Thursday, January 10, 2008

Electricians, Datacom Installers and Maintenance Pro's now have an easy way to print Durable Labels

With the Rhino pro 5000 you can design long-lasting labels for wire wrapping, patchpanels, terminal blocks and more, in just seconds. The Rhinopro 5000 is the leading model in the Rhino lineup. It offers features that will clearly add a touch of professionalness and efficiency to your work.

Rhino pro labels are as tried and true as the Rhino pro 5000. Distinct to use and super-strong, they're designed for the long haul. The varying label materials obtainable are: (i) Permanent Polyester (ii) Flexible Nylon (iii) Vinyl (iv) Heat dwindle Tubes (v) non-adhesive. Flexible Nylon is geared to Rounded or dead flat surfaces, like wires, patchpanels, machinery, equipment, bins. Permanent polyester is for Flat surfaces like equipment, bins and patch panels. Vinyl is congruent with really surfaces, perfectly for outdoor and color-coding environments. Heat Dwindle Tubes are clearly for wires and cables. Non-adhesive tags are for Patchpanels, distribution blocks, face plates etc.

The Rhinopro 5000 isn't just your common everyday label maker. Remember, this one is targeted at Electrical contractors and Cable Installers, so it has to have some features that set it incomparable from its competition. "Hot keys" are what distinguishes the Rhinopro 5000, and here are a few examples:

"Terminal Block Mode" prints labels somewhat similar to Patch Panel labels, but the text is printed vertically as opposed to horizontally.

"Patch Panel Mode" allows you to generate long labels that have equably spaced 'blocks' of text, i.e. Ethernet ports on a patch panel. You define the number of ports, set the entire length of the label, and then print. The blocks of text will be correspondingly spaced to in actuality discover which each port is being exercised for.

A large backlit screen and many other considerately designed features help you whiz your way through label-arduous installations and accord a bumper impression behind. Plus, easy-to-load, easy-to-peel Rhino pro label cartridges feature industrial-strength adhesives so your labels will stick and stay stuck.

Sally is the Marketing Manager of Labelcity Inc. - the largest dedicated supplier of Dymo Labels & Printers, as well as the Dymo RhinoPro 5000 featured in this article.

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Tuesday, January 8, 2008

Train To Be A Great Electrician At An Electrician School!

If you are good with electrical appliances, have you ever thought of being an electrician? If so, it is important to get your training at an electrician school. Prior to that, what are the requirements of being an electrician?

As you know, electricity is part and parcel of daily life. As an electrician, you may be working in different locations and construction sites. Some jobs of an electrician include repairing, installing, connecting, testing and maintaining electrical systems. Some risks involved in the job of an electrician include electric shocks, falls and cuts. Since these risks can be quite serious, it is necessary for an electrician to attend an electrician school and undergoes the proper electrician trade school training program.

Most people start as an apprentice electrician which is a mixture of work based and class room learning at an electrician trade school. To start an apprenticeship, candidates should have a good high school education and be at least 18 years old. Other people may choose to train before seeking a job as an electrician or even attending an electrician school.

Some criteria for being a good electrician include: good hand-eye coordination, good physical fitness and being well balanced. Other attributes include good problem solving skills and being able to distinguish colors. It is also important to be able to maintain and improve on the skills developed during the electrician trade school training program.

Generally, electricians have a positive career prospect. The need for electricians is considerable since there is an ever increasing demand for electrical appliances and other electrics. With the advancement of technology, there will probably be an increase in workload across the country more than ever before.

Electricians who work on construction sites may be subject to less work depending upon the economy at the time. If less houses and buildings are being produced, there will be less use for an electrician.

If you have always wondered about how much an electrician is paid, then wonder no more. An apprentice electrician can start off at around $25,000 per annum. But, as a fully
trained electrician, he can earn $46,000 or more per annum. Ultimately, how much an electrician gets depends on the company he works for and how well the economy is doing.

Finally, if being an electrician is an ambition of yours, put in some effort to find the right electrician school for you and start your training program soon!

Visit Top Electricians for even more top electricians? tips. Remember to read more about Electrician Trade School Training Program while you are there! It's free!

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Sunday, December 30, 2007

Some Do's and Don'ts When Hiring An Electrician / Electrical Contractor

Selecting the right electrical contractor isn't as easy as picking someone out of the Yellow Pages. The ramifications of hiring the wrong contractor can be financially disastrous and even dangerous.

First and foremost, it's imperative to know if the contractor you're considering hiring, is licensed, bonded, and has adequate general liability and workers compensation insurance.

Then, you need to determine if they are experienced in the type of work you need performed, and if they are generally considered good, honest and reputable.

The best place to start answering some of these questions is at the Board of Examiners of Electrical Contractors and / or the Division of Consumer Affairs (basically the Authority having Jurisdiction), and of course, the Better Business Bureau.

Now lets pretend for a moment that you have an electrical job you need done. Not an emergency -- perhaps it's just fixing a light that stopped working. What would you do

Would you call a few contractors and get multiple bids You can, but I wouldnt necessarily suggest it.

Most people think that they should get multiple bids for every job. This isnt the case, and in actuality, putting to bid every little job may in fact backfire.

Good contractors are few and far in between, and asking for multiple bids for a small job will only alienate them the next time around. Try looking at this from their point of view. Their time is worth probably about $100/ hr, and yet, he or she makes the time to come to your residence and provide you with a free estimate for whatever work you may need.

Typically, a good contractor will try to provide you with an extra-competitive bid, especially the first time around, just to make you a customer.

But how can you tell if the first contractor walking into your house is The good contractor Some simple rules may apply here, but remember there also are exceptions to every rule.

 A good contractor will typically look the part. In other words, if he or she looks messy and disorganized, then it's probably indicative of the type of work he or she does. Someone who takes pride in their work usually takes pride in their appearance. Some contractors may argue this point, but remember we're talking generalities here and not the exceptions. He or she should have some type of company identification (even a shirt with a logo would do).

 A good contractor will have company cards with their company name and / or their name, telephone and license # on it.

 A good contractor will respond to your calls quickly and provide you with a free estimate (for most jobs) the same day or within a reasonable amount of time, and will take the time to explain what they will do and how they will do it.

 A good contractor will never offer to do the job without taking out permits and may even walk away from a job if the homeowner insists on not taking them. Remember, permits are additional insurance for the homeowner guaranteeing (through inspection) that the job was performed safely and correctly.

 A good contractor will never cut corners and do something unsafe in order to accommodate your budget. They will, instead, offer suggestions on how to modify your plans to meet both their code and safety requirements, and your budget. If these two cannot meet, then they will wish you good luck and walk away from the job.

 A good contractor will be happy to provide you with copies of their insurance certificates and references when asked. Try not asking for them unless it's a decent size job.

Suppose a homeowner would like to make a minor alteration or addition to their electrical system. If the electrical system is old, then that part of the system may need to be brought up to current code standards before they can add to it or modify it.

In order to circumvent this regulation, the homeowner may insist that the job be done without permits and possibly even hire someone unlicensed to do the work.

What he or she doesn't realize is that if their house burns down, they will very likely NOT be covered. Your homeowners policy probably states (very clearly) that anyone doing work on the residence has to be properly licensed and all building, plumbing and electrical codes must be followed, and work performed with permits wherever required.

If you hired someone whom you thought was licensed, but ultimately wasn't, it still may NOT be covered because you didn't take out permits for the work, and as far as the insurance company is concerned, it was done illegally.

If and when you decide to put a job out to bid, make sure that the work is properly specified (in minute detail) so that all the contractors are bidding on exactly the same things. Otherwise, there's no way of telling who's bidding apples and who is bidding oranges. Not properly specifying a job is probably the most common mistake homeowners make.

Why Let's assume you need to have 10 receptacles, 4 lights and 2 dimmers installed in a room. Without specifying the exact types such as (Standard, Decora, other), amperage (15/20), location and method of use (this is used by good contractors to determine how many receptacles to put on a single circuit), types of lights, bulbs (R30, R40, halogens, etc.) and trims (for Hi Hats) standard, eyeballs, etc., wattage of bulbs (determines type and rating of dimmers used), there is no way of telling who is bidding what. And these are just some of the variables used for a fairly simple job!

 A good contractor always uses first-class, contractor-grade materials and never uses anything else, regardless of budget. They will usually price and give you the higher grade items automatically. This is where they get in trouble when bidding with other contractors. Someone else may be using approved but inferior materials, which would enable them to come in considerably lower than the good contractor. They probably know that you'll have problems with the items installed sooner rather than later, but don't care because it falls beyond their warrantee period (if they even have one).

 A good contractor will take into consideration how the receptacles are being used (such as computers, entertainment equipment, vacuum cleaner, etc.) and automatically factor in (price) dedicated lines for these items, even though current codes may allow all of the receptacles to be wired on a single circuit.

Other contractors won't, and will therefore be able to do the job cheaper. Of course, when you start tripping breakers because the new receptacles are overloading the circuit, there won't be anything to do about it, because it didn't violate any codes at the time, and more importantly, you didn't specify it.

But how could you specify it You're not in the electrical field, and you assumed the contractor would know better and factor this in.

Well, you're right. The good contractor already factored it in, but you gave the job to the other one.

Are you starting to get the picture about the dangers of multiple bids Very often, you don't end up with the good contractor.

That's a pretty typical bidding scenario, and its obvious why people are intimidated dealing with contractors. Make the wrong move and it can spell big trouble.

Anyway, if you do bid the work, try to have it properly specified perhaps by an architect or engineer. A good rule of thumb would be, if you get multiple bids, always pick from the middle up, and never, ever pick the lowest bid.

When you've finally selected a contractor, ask them for a copy of their insurance policies, and make sure everything (including start and end dates on larger jobs) is in writing.

Very often smaller contractors work out of their own house or garage, and many do not carry workers compensation insurance. This may or may not be a factor. If they have a helper with them or send someone else to your house to do the work, it becomes a huge factor.

Without this insurance policy, you (the homeowner) are 100 % liable for any accidents their workers may incur. Additionally, many contractors have only enough general liability insurance to satisfy state regulations, but nowhere near enough to pay for your house if it burns down.

Finally, a last note of caution; as with everything else in life, you get what you pay for ".

In other words, don't let price alone be the determining factor when hiring an electrical contractor. Remember, if a plumber messes up, youll have a flood, if an electrical contractor messes up youll have a fire or perhaps even worse.

Good Luck.

Resources

This article was written by John Frezados and published on www.electrician-electricalcontractor.com , which is a website dedicated to providing industry, trade and employment information for electricians and electrical contractors. The article was part of a series of articles at www.electrician-electricalcontractor.com/electricalcontractor.html , written for Electrical Contractors, to help improve their methods of operation and profitability. John Frezados is a Mechanical Engineer, a Licensed Master Electrician and Certified Electrical Instructor, and has over 20 years experience in the Electrical / General Contracting fields. He currently spends his time writing, teaching and consulting in the Electro-Mechanical Contracting and Engineering fields. He has authored numerous books and courses, such as "The Electrical Contractor's Blueprint for Success" and "Custom Estimation Systems for Electrical Contractors" and teaches certified continuing education courses (listed at www.ccesllc.com ) for Electrical Contractors.

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Sunday, December 9, 2007

Electrical Engineering Technology

In order to succeed in their jobs, electrical engineers have to be familiar with a variety of electrical engineering technology. To deal with various aspects of electrical engineering technology, electrical engineers must become familiar with various theories of communications, electricity, and electronics. Electrical engineers can use electrical engineering technology to help them develop new systems, test systems, and make older systems more effective and efficient. Electrical engineers learn the drafting, designing, and technical skills that they will need to put their ideas as an electrical engineer into action.

One type of electrical engineering technology that electrical engineers must be very familiar with is the technology of circuits and how they work. In its simplest form, an electrical circuit is a connection of electrical elements that is in a closed loop to allow the current to pass through continuously. Electrical engineers learn how to predict where the current is in the circuit and the voltage that is in the circuit, as well. In today?s world, it is much easier to design circuits than ever before due to newer electrical engineering technology that has software called circuit simulation software, to design the circuits safely and effectively.

Digital and analog electronics is another form of electrical engineering technology that engineers must be well acquainted with to perform their jobs. Both digital and analog electronics are used in computers and phones, however, digital electronics are becoming more widely used as analog electronics is becoming more and more outdated. This form of electrical engineering technology requires that engineers understand Boolean algebra, digital circuits, and how logic gates work. Even those that deal with digital electronics must also understand the electrical engineering technology of analog electronics as well. Digital electronics are usually built with various analog components, so understanding how analog electronics work is essential.

Another type of electrical engineering technology that electrical engineers must be familiar with is opto-electronics. This technology deals with how light interacts with devices that are electric. Various forms of light that may be used to interact with these devices include X-rays, infrared, gamma rays, and ultraviolet rays.

Electronic engineers also have to be familiar with the electrical engineering technology that deals with control systems as well. Control systems are used to control electrical devices as well as regulate and command them. Engineers must know the differences between sequential controls and linear controls and how to properly and effectively use these control systems. This type of electrical engineering technology can be used in a variety of ways from controlling your computer to controlling aspects of a space shuttle.

If electrical engineers are going to be effective in their jobs, they must understand electrical engineering technology and how it works. There are many different technologies that they must use together in their work each day. Because of the knowledge required, becoming an electrical engineer is not for the faint of heart. It takes years of study and work to be able to implement various forms of electrical engineering technology in order to successfully complete electrical engineering jobs.

To learn more about this challenging career and get into more details about life as an electrical engineer, visit electrical engineering technology.

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