How to make a car cell phone charger (circuit level). Just the pretty basic idea

You will need a power source: You can use

• Car 12V power supply
• car cigarette lighter may be
• Find electrical wiring of the car

Then find/buy/make a connector to the power source and/or use wires/cables to connect to them as applicable

Now check the charger port of the cell phone that you are using Is it circular? or flat with some pins/small iron bars. Check the specification of that particular model of the cell phone. Find out the pins that are used for battery charging. Usually the cell phone specifications will have that. Try to find out which pin takes how much volt? If it’s a circular port, you also need to find out how much volt/amp to pass and to where.

Now find a chip that can convert the 12v car volt to the required volts (as required by cell phone ports/pins). Or make such circuit using multiple chips. You may need to connect several such chips/resistors in serial to get the desired voltage levels. Use resistors if required.

Now, create the connecting wire to connect voltage source to the cell phone port. You may need to use multiple wires if the cell phone has multiple points to feed voltage to.

oh yes, you gotta supply voltages from the car power source to the power sources of the chip/(s). So you need some wires/cables in that section as well. THE Circuit Part Will be in the middle with wires/cables in both directions from it

Now work on packaging: the input port (car end), the connecting wire, the output port (cell phone end).

Take professional help before trying this idea.

Read below, to get ideas on which chip to use. Also, check full specifications as provided in some of the URLs below [Reference: the Internet]

http://www.romanblack.com/smps/conv.htm +5v to +13v Converter

How about DIY? You can use either 78L05 (100mAmp), or 7805 (1Amp), or LT1804CT-5/LM1084IT-5 (5Amp). With any of those chip and couple caps, you can make your own 5V regulator for less than 5 bucks.

http://www.mp3car.com/power-supplies/24383-12v-to-5v-step-down.html

http://www.supplyframe.com/partsearchservlet/partnerWormhole.action?id=981155&partnerName=DSA

I’m planning on using LT1084CT-5 because it’s a fixed voltage and has enough head room for two 4-port usb hubs. Thing is, someone mentioned that you have to have other components, is that true? or can I just connect three wires to it and call it a day?

Forget using a 7805 regulator unless you have one on hand, and have room for a fat heatsink. Go to a “dollar store”, thrift store, or flea market, and buy an obsolete car charger for a cellular phone. These typically contain an a small circuit consisting of about a dozen components, primarily a MC34063 switchmode-regulator chip (an 8-pin integrated circuit) that is much more efficient than a 7805 (and therefore waste less energy as heat). If you take it out of the case (insulate it with a piece of heatshring or bicycle tube), a typical 12->5v phone charger circuit is no larger than a 9v battery and can handle about 1 ampere of current. You can’t build one for the price you’ll pay at a junk store. You can change the output voltage to anywhere from 12v to 1v by changing one of the resistors (google mc34063 datasheet for details).

http://www.onsemi.com/pub_link/Collateral/MC34063A-D.PDF From: http://sitestree.com/?p=3547
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Post Data:2016-07-06 15:50:35

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Some resources as can be found in the Internet

• An introductory book on Microprocessor Design
• Research Articles on Microprocessor Design
• Chronology of Microprocessors

From: http://sitestree.com/?p=3543
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Post Data:2016-07-06 15:53:06

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Just some resources on : Create a Parallel Computer Using PCs/Desktops.

• How to Build a Parallel Computing Cluster: http://proj1.sinica.edu.tw/~statphys/computer/buildPara.html

• set up a high performance computing cluster in a few minutes: http://idea.uab.es/mcreel/ParallelKnoppix/

• Parallel Computing Using Linux: http://www.linuxjournal.com/article/1350

• $99 Super Computer: http://www.zdnet.com/parallella-the-99-linux-supercomputer-7000014036/

• How to connect several pcs together to make parallel computing: http://www.tomshardware.com/forum/44636-42-connect-make-parallel-computing

From: http://sitestree.com/?p=537
Categories:Computer Hardware Engineering, Root, Computer Networks, By Sayed Ahmed
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Post Data:2013-11-15 02:13:24

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Windows 8 as Microsoft claims is the most secure operating system from Microsoft.

Some ways to secure your Windows 8 PC.

As Windows 8 is built upon UEFI (Unified Extensible Firmware Interface), you can take advantage of secure boot; scan and ensure that system elements are okay before Windows 8 even boots on your system.

Yes as usual you can set a PIN/Password to login into the PC
You can also set a picture password. You need to select a picture, draw some gestures on the picture for Windows 8 to store. You need to make the same/similar gesture at login time. You can do this from PC settings->user : follow the rest
Windows 8 also has features built in for face detection and auto login/logoff.

You can install windows defender to protect your PC from Malware and Spyware
From start screen type defender, you will find the application. If it is disabled, you may need to remove the other antivirus software first, then activate it, and then again reinstall the other antivirus software

Firewall is always there to protect your pc from unwanted access from outside. You can define rules for private network and public network. Public network settings should be more strict. You can configure to block all incoming request; or you can configure for notification for all incoming access requests and then allow individually. Turn on Firewall.

Use Action Center as can be seen in the control panel to check the security settings and also to change.
Configure ‘User Account Control Settings’ as can be seen under Action Center. Use the most strict settings so that you get notifications for all changes in your system. Move around the action Center and configure appropriately such as checking alerts, checking system notifications, checking and administering archived messages, configuring what to do with unrecognized apps and similar.

Use the privacy settings; you may configure not to allow to access your location information. You may only allow selectively. Use PC Settings->Privacy.

From: http://sitestree.com/?p=307
Categories:Computer Hardware Engineering, Root, Computer Troubleshooting, By Sayed Ahmed
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Post Data:2013-05-31 21:08:47

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Load Balancing with CISCO Routers:
What is load balancing?
Simply, distributing the traffic across multiple different paths/destinations. The definition is context-specific as well. For example, if you provide a web-service, you can use multiple servers to provide the service. Then for you, load balancing can be simply distributing the incoming service request across these servers (than just to one server). For the network operators (say the internet operators), load balancing can be distributing the network traffic across multiple paths so that some paths are not congested (traffic is even across the internet backbone).

“A definition from the online Wikipedia:
In computer networking, load balancing is a technique to distribute workload evenly across two or more computers, network links, CPUs, hard drives, or other resources, in order to get optimal resource utilization, maximize throughput, minimize response time, and avoid overload. Using multiple components with load balancing, instead of a single component, may increase reliability through redundancy. The load balancing service is usually provided by a dedicated program or hardware device (such as a multilayer switch or a DNS server).

It is commonly used to mediate internal communications in computer clusters, especially high-availability clusters. If the load is more on a server, then the secondary server takes some load while the other is still processing requests” [http://en.wikipedia.org/wiki/Load_balancing_%28computing%29]

Check: http://www.google.com/search?hl=en&defl=en&q=define:Load+balancing+&ei=7SKUS-v9O4nqM8GqiY0N&sa=X&oi=glossary_definition&ct=title&ved=0CBQQkAE

Some resources for Load Balancing with CISCO Routers:
Before pointing you to the resources, some notes

• If you go through an undergraduate program in Computer Science, you will know the theory behind most of the protocols as will be named in the resources. If you go through the materials for Cisco certifications, you will know the IOS commands to deal/interact with the protocols (configure the protocols in real life situations).
• Universities may not give you an opportunity in your undergraduate program to deal with real-life routers, and play with the routing protocols. If they would (even as an extra facility not part of your courses) that could be something very useful for your career (esp. when network/telecommunications oriented) (could even make you more interested in networking/inter-networking careers).
• However, universities may teach you writing prototype network software, network protocols, and components for network operating systems. Universities will also teach you the graph theory, queuing theory, and analysis of network protocols. These are must know to write routing/networking protocols. The people who write the network operating systems, and/or network/routing protocols are mostly from theoretical (university) backgrounds. Even if your interests are to implement routing logic in hardware, and designing and implementing routers, university education (in Comp. Eng.) will be of more help than Cisco Certification materials (knowing these CCNA/CCNP materials will always be a plus)
• (Limited Opportunities): If your intentions are to come up with new and better routing protocols, improve the efficiency of the existing protocols, and even discover new routing protocols for newer computing platforms (such as Sensor Networks, Zigbee, VOIP, and similar), you will mostly require to go through research based Masters and PhD programs in Computer Networking and related [In another word, graduate studies (in networking) focus on these (Improving existing protocols, network standards, inter-networking standards, data transfer methods, routing. Also, discovering new protocols, network standards, inter-networking standards, data transfer methods, routing, and related].

• How to Configure Load Balancing in a Cisco Router
• Training Videos on Load Balancing
• Load Sharing with BGP in Single and Multihomed Environments: Sample Configurations
• How Does Load Balancing Work?
• Load Balancing in BGP Networks
• BGP Load Balancing
• Cisco T1 Load Balancing HOWTO

From: http://sitestree.com/?p=3549
Categories:Computer Networks
Tags:
Post Data:2016-07-06 15:47:00

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