How to Buy a Power Supply

The power supply unit (PSU) is one of the few items in an electrical device that will affect the performance and reliability of your entire system. It’s often the most undervalued, under-appreciated component within any device, yet one of the first components to cause failure.

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This article focuses on the factors to look for when purchasing a PSU for a personal computer, but it may be applied to any application needing a regulated PSU. When following this guide, take into account your own application, and appropriately weigh each factor.

1. Determine the wattage you need.
Use a PSU calculator web page or software to help determine your requirements. Even better is to find a review of a similar system that measures power consumption. As that consumption is measured at the wall, multiply by the review system’s power supplies efficiency to get the output. (If you don’t know, 0.82 will be close or slightly pessimistic.) Don’t purchase a PSU just above your requirements unless you plan not to upgrade the system. Also, PSUs age, losing power over time. Purchase a PSU that will take you through your next few upgrades, over a multiple-year period.

2. Research which connectors you need.
Newer PSUs will often provide both a 24-pin ATX connector that doubles as a 20-pin connector. Higher-end models may only provide a 24-pin connector, and lower-end models may provide just a 20-pin connector. Typically, most Pentium 4 and Athlon 64 CPU-based motherboards (and earlier) will require a 20-pin ATX connector, while newer motherboards require a 24-pin ATX connector. Also, most PSUs will have both a 4-pin and 8-pin auxiliary 12V connector for motherboards, and only high-end PSUs will have one or more 6-pin PCI-E connectors for video cards.

3. Look for PSUs with high-efficiency ratings.
And, ones rated under load temperatures, not room temperatures. Anything 80% and above is good. At 83%, approximately 17% of the wattage is lost as heat. Therefore, a PSU that may be advertised as a 500W PSU, will actually be drawing almost 600W at the wall. Efficiency drops over time and during the life of the PSU. A year-old PSU is most likely not capable of producing the same amount of energy it once did when it was new.

4. Determine the robustness of the PSU.
How well does the PSU handle changes in current? Although not a guarantee, there’s a strong correlation between weight and quality: bigger components (ie, capacitors) equate to a more tolerant, reliable PSU. This is one downside to a 120mm fan: while it does provide quieter cooling, the components to be cooled must be more tightly packed. If you don’t care about noise, an 80mm cooling fan in the traditional place on the rear of the PSU may offer better value.

5. Check the number of rails.
Just as your house’s fuse box includes both a large main breaker and a smaller circuit breaker per circuit to ensure the smaller-branch circuit wires do not overheat, high-capacity PSUs divide their output into multiple “rails,” each with a smaller current limit. The relevant safety standard requires a 20A limit, which is quite generous, given that the wires are smaller than those used in your house to carry 15A. (But there’s the advantage that the wires aren’t hidden in walls, so they’re cooled better, and you’ll smell it if something starts burning.) This, however, makes connecting the PSU more complex; in addition to not overloading it overall, you have to avoid overloading each rail, or it will shut down. A good power supply will make that easy by providing rails totalling much more than the total PSU rating. A cheaper alternative is to provide just enough rails to total the overall capacity, which makes it difficult to use all of a power supply’s capacity. (This may be a clue that the PSU is incapable of delivering its full-rated capacity.) An even cheaper alternative, which has become quite popular, is to eliminate all of the safety circuitry and produce a “single-rail” power supply that can deliver all of its output on any wire. This is technically in violation of the ATX-power-supply specification but has not proved to be a safety problem in practice, and is preferred by many people. A single-rail design isn’t itself a sign of a low-quality PSU.

6. Get a modular PSU.
It will help eliminate extra wires to get in the way of cooling. Ignore the claims by PC Power & Cooling that modular cables create more resistance due to corrosion of contacts. The additional resistance is negligible.

7. Compare the amperage of each voltage.
A PSU’s wattage rating isn’t conducive to determining amperage at any specific voltage. All PSUs will have a sticker with their rated amperage at each voltage level. This information should be provided when purchasing a PSU from an online vendor and visible on the unit’s retail box. As mentioned above, modern computers are 12V-heavy loads. A 500W PSU may sound adequate, but if its 12V amperage is in the low 20s or less (12V times 25A is 300W), it may not be able to power a modern computer.

Original source :
http://m.wikihow.com/Buy-a-Power-Supply

Peluang Usaha untuk produk Lampu LED – Solar Cell

Dengan melihat kondisi dan situasi Indonesia saat ini dimana sebagian besar masyarakat terutama dipelosok pelosok daerah sangat memerlukan dan membutuhkan penerangan listrik, namun sayangnya pemerintah masih belum dapat menjangkau dengan beberapa kendala. Demikian halnya wilayah yang sudah dialiri listrik pun tidak luput dari masalah dimana seringnya pemadaman listrik serta kenaikan tarif listrik sehingga selain mengganggu aktifitas sehari hari terutama malam hari juga beban biaya bulanan listrik yang semakin tidak murah.

Untuk mengatasi hal ini, kami menawarkan solusi sembari berhemat. Solusi ini dapat menjadi alternatif bagi masyarakat luas untuk memenuhi kebutuhan penerangan ditempat tinggal dan lingkungannya. Selain investasi yang murah juga penggunaan dan perawatan yang mudah ditambah lagi sumber listriknya dari sinar matahari yang tidak pernah habis dan menyinari bumi Indonesia sepanjang waktu, sepanjang tahun.

Dengan memanfaatkan sinar matahari yang bersinar sepanjang tahun di wilayah Indonesia ini, produk ini akan menjadi solusi tepat dan ekonomis mengatasi kendala yang kami sebutkan diatas. Produk ini juga telah mendapatkan sertifikasi dari BPPT dan LIPI dengan garansi 12-bulan dengan nama produk LAKETS.

Dengan potensi kebutuhan yang sangat tinggi dan peluang pasar yang masih sangat terbuka luas maka kesempatan ini sangat sayang bila dilewatkan. Untuk itu kami memberikan kesempatan kepada siapapun untuk menjadi Reseller kami untuk memasarkan produk ini di seluruh wilayah Indonesia.

Perlu diketahui bahwa potensi keuntungan finansial dapat diperoleh secara maksimal dengan memasarkan produk ini di target konsumen yang tepat dimana kebutuhannya sangat tinggi.

Beberapa segmen market yang dapat digarap oleh Reseller antara lain :
1. Perumahan di daerah yang belum mendapatkan pasokan listrik PLN,
2. Perumahan di daerah yang sudah mendapatkan pasokan listrik PLN akan tetapi sering putus-listrik (mati-lampu)
3. Penerangan jalan kampung/gang atau kompleks perumahan
4. Daerah pariwisata yang jauh dari kota dan belum ada pasokan listrik PLN,
5. Daerah perkebunan dan pemancingan yang biasanya belum ada pasokan listrik PLN,
6. Pedagang kaki-lima (baik yang pakai gerobak maupun yang mangkal di pinggir jalan) tdk punya pasokan listrik PLN,
7. Kegiatan-kegiatan outdoor : camping, fishing (di pantai dan di perahu), emergency, dll

Perangkat dan Harga

Perangkat LED-Solar Cell package ini mencakup 1 set perangkat yang terdiri dari :

a. 1-unit solar-panel 15WP,
b. 3-unit lampu-LED yang sudah dilengkapi dengan battere teknologi tinggi Lithium 4400mAh
c. Remote-Control untuk lampu sebanyak 1-unit
d. 1-unit DC-Hub dan
e. 3-unit kabel DC.

 

Paket Lampu-LED dgn Tenaga-Surya 1

 

Harga Jual ke Konsumen :
Kami sarankan untuk Konsumen adalah dikisaran Rp. 4.600.000,- sampai dengan Rp. 5.600.000,-. Harga dapat disesuaikan mengikuti volume penjualan. Garansi produk 12 bulan.
Margin Reseller hingga 30 % per set.
 

Yang berminat menjadi Reseller, bisa menghubungi kami COMPUTER PLUS di (021) 8886 6233 dan (021) 9130 1267 atau 0813 1966 5570 (WA Only) atau email ke bekasimcc at gmail

SMART Meetings Video 3 See how Smartboards can be used in business by Portsmouth Comms 0800 849 7888

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Portsmouth Comms 0800 849 7888 – An entertaining way to find out more about the benefits of using Smartboards in business. The SMART Board™ has a large, interactive screen on which you and your audience can share a presentation, explore a website or take a virtual trip. It allows you to create dynamic, engaging presentations and, within the education environment, helps you improve student motivation and performance by making enquiry-based learning a dynamic classroom experience. You simply touch the surface to select menus and icons.

Visit our Website here

Looking for Unlimited Everything Plan in the Cloud ?

If you are looking for unlimited everything plan in the cloud, here is the right place for you. Amazon the Titan will provide you unlimited storage capacity in the cloud just for $5 per month. It’s a little amount for everything you want to store inside. Read full article below.

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King of the cloud, Amazon offers unlimited everything

March 26, 2015| By Gina Acosta

In its quest to offer its customers everything from one-hour delivery of toilet paper to instant TV streaming, Amazon nowwants to dominate the market in cloud storage with a dirt cheap new plan.

For $5 a month, customers can sign up for Amazon Cloud Drive and store as much digital content as they want.
The company with the unlimited plans, customers no longer need to worry about how much storage is needed to keep their content safeand secure: they can choose either the Unlimited Photos Plan or Unlimited Everything Plan and only pay one flat fee per year.

A free 3-month trial is available for customers to try either plan:

Unlimited Photos Plan (free 3-month trial,then $11.99 per year—equivalent of less than $1 per month): Store an infinite number of photos in Cloud Drive without worrying about taking up space on phones, cameras, or other devices. Customers can upload existing collections and store all future photos taken. This plan also includes 5 GB of additional storage for videos or other documents and files.

Unlimited Everything Plan (free 3-month trial, then $59.99 per year—equivalent of less than $5 per month): Store an infinite number of new and existing photos, videos, files, documents, movies, and music in Cloud Drive.

“Most people have a lifetime of birthdays, vacations, holidays, and everyday momentsstored across numerous devices. And, they don’t know how many gigabytes of storage they need to back all of them up,” said JoshPetersen, Director of Amazon Cloud Drive. “With the two new plans we are introducing today, customers don’t need to worry about storage space—they now have an affordable, secure solution to store unlimited amounts of photos, videos, movies, music, and files in one convenient place.”

Beginning today, customers can start experiencing unlimited cloud storage for free with a 3-month trial on either plan. Prime members and Fire device owners who already enjoy unlimited photo storage can choose to sign up for the Unlimited Everything Plan to store videos and files in addition to photos. Existing Cloud Drive customers can change their plans now by simply logging into their Cloud Drive accounts.

iStorage datAshur Secure USB Flash Drive

The iStorage datAshur® is the world’s most secure, easy to use and affordable USB flash drive, employing PIN code access with military grade AES 256-bit hardware encryption. The datAshur incorporates a rechargeable battery allowing the user to enter a 7-15 digit PIN onto the on-board keypad before connecting the drive to the USB port.

Energize Lessons with the SMART Response XE Interactive Response System

smart response article

In chemistry, the term activation energy is simply defined as the minimum energy required to start a chemical reaction. And when it comes to teaching any type of STEM-related subject, it may sometimes feel as though it takes a lot of energy to get a reaction from your students.

That’s where the SMART Response XE interactive response system comes in. As one of SMART’s five interactive response systems, SMART Response
XE enables you to assess learning quickly. Students can instantly respond to science or math questions – whether they’re about chemical reactions, gravitational force or the periodic table – and demonstrate their understanding of a concept.
And the SMART Response XE system is the only interactive response system that includes remotes (or clickers) with a full QWERTY keyboard, enabling students to include math equations and scientific functions in their answers.

 

Accelerate Learning
Whether its chemistry, physics or calculus, students are often writing, balancing and solving equations. With the SMART Response XE system, you have the freedom to ask true-or-false, multiple choice and text-based questions to get an indication of student understanding or to go deeper into your assessments by having students answer questions using math expressions and scientific functions.
The system also includes a flexible feature called intelligent grading, allowing you to choose a range of answers that you’ll accept as correct. With intelligent grading, you can decide if you’ll recognize an answer only in its exact order, in any order or in its mathematical equivalent.

For example, when allowing for equivalent representations of the same answer, both of these acceleration formulas would be graded as correct by the SMART Response XE system:

formula smart response

 

Get the right reaction
With SMART Response XE, you can quickly create math- or science-based questions using SMART Notebook collaborative learning software, and students can use their remotes to type in answers that contain equations, formulas or symbols.
When students finish answering, the remotes will instantly provide them with confidential feedback. The answers are also anonymously summarized as a pie chart or bar graph in SMART Notebook software, making it easy for you and your students to discuss, compare and learn from the answers.

 

Fast Fact
fast fact smart response
• Complete assessment system – Experience the convenience of the wireless, keyboard-style remotes, a receiver and powerful assessment software
• Instant insight – Conduct formative and summative assessment to instantly gain insight into your students’ understanding of a concept or lesson
• Designed for middle and secondary lessons – Use the SMART Response XE system for teaching middle and secondary lesson content, including advanced math and science content. The remotes allow students to input math equations and scientific functions.
• Flexible assessment – Ask different types of questions, including true or false, yes or no, multiple choice, textbased, math expressions and scientific functions. And the intelligent grading feature enables you to choose a range of acceptable answers for a  question, allowing for multiple representations of the correct answer.
• Easy to manage – Use the Teacher Tools feature to create class lists and view and manage all your student assessment data in one location. The built-in gradebook enables you to record test scores, track performance and create reports.
• Integrated with SMART Notebook software – Create dynamic questions and assessments by accessing SMART Response directly in SMART Notebook software. With one touch, you can deliver assessments on the SMART Board interactive whiteboard. You can also show assessment results on a SMART Notebook page and add comments in digital ink.

Case Study : Al-Shifaa Bint Ouf Secondary School for Girls, Amman Jordania – Extraordinary Made Simple

We are highlighting science in this issue and we’ve selected a few research studies that report the benefits of SMART products in science classrooms, grant programs that can assist you in purchasing the right technology products for your school and some other great resources available to you. We hope they provide you with ideas and inspiration for your science classroom.

case study Al-Shifaa Bint Ouf

REPORTS
SMART Board Interactive Whiteboard Utilization in Al-Shifaa Bint Ouf School
In a study released by the Jordan Education Initiative in March 2010, students from the Al-Shifaa Bint Ouf Secondary School for Girls, located in an underprivileged and overpopulated neighborhood in Amman, Jordan, report that they feel more engaged and motivated when learning math and science with the school’s two SMART Board interactive whiteboards.

Elementary Science Lab Outreach Efforts: Extending Science Lessons to Support Improvements in Students’ Study Skills and Math Performance in Grades 4, 5 and 6
This project by Kathie Heirigs and Halima Thurmon at St. Joseph Catholic School in Memphis, Tennessee, sought to determine the most effective study methods for improving critical math skills for inner-city students. To determine final outcomes, standardized test scores from fall 2007 and spring 2008 were compared using the Iowa Test of Basic Skills (ITBS). Various specific and related skills sections of the ITBS data were examined and significant improvements were noted. In many cases, individual students who were performing below both grade level and the national average showed such significant gains that the project was considered successful in helping to close the gap for targeted skills with these inner-city students.

Report on the Use of the SMART Board Interactive Whiteboard in Physical Science
This project by Dr. Deborah Damcot, Janet Landato and Collette Marsh at William Rainey Harper College in Chicago, Illinois, in 2000, measured the effectiveness of using a SMART Board interactive whiteboard in physical science topics that require visualization of complex phenomena. Among their findings, students self-reported that lectures featuring the SMART Board interactive whiteboard were more interesting and that the use of color helped better understand science concepts.

If this school gain the benefits of SMART Board product series for education, so why you don’t want to do the best for your classroom and your school ? Let’s help you find the right solution for your classroom, just by drop email to us.

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