New Computer

  
I got a new computer today, an HP Pavilion; Media Center PC: m7470n. The PC has a AMD 64x 4200 Dual Core processor with 2GB of memory.

I'm loading software tonight. Sometime this week I'll starting trading hardware with my other PC ~ I want the Alienware PC to be the media/video PC, not this one.

Not the PC I really wanted, but it was the best one they had in stock ~ instead of ording one and having to take a day off to receive it.

AMD dual core, PCI Express, 2G Bytes of memory. I don't see a video card, the VGA connector is in the wrong place?

Web Site Visit Location

The recorded data over the last three weeks for visits to http://www.interfacebus.com by country:

United States: 43.14%
United Kingdom 7.13%
Canada 5.20%
India 5.01%
Germany 3.39%
Australia 2.28%
China 1.84%
Italy 1.72%
Taiwan 1.69%
France 1.59%
Other 27.01%

700Mhz RF Frequency Band

700Mhz Frequency Band

This is one of the RF Frequency band up for grabs, from the FCC, in a few months which may be used as the new wireless web. I saw a few articles which indicated that some internet companies may want to get into the web business, by passing fees from cable/phone companies for bandwidth usage.

Companies like Google may purchase RF bandwidth to start a 'wireless' web to bypass proposed fees from cable and phone companies because of their high bandwidth usage {video/audio downloads}.

There are a number of bands up for grabs ~ this one seems hot. Many of the bands are being freed up because TV broadcasts are moving from analog to digital which consumes less RF spectrum.

IEEE 802.11n

I added a new page to cover the new 802.11n specification. The page address is here;
http://www.interfacebus.com/IEEE802-11n_Wireless.html

It's the first day so the page is really just a copy of the 802.11g page, but I should be able to update that page this week end.

The IEEE 802.11n standard is still in a draft version.

802.11n supports 802.11b and 802.11g, and also runs at over 300Mbps which is a large increase over the g version that runs at on 54Mbps.

There are some pre-N products out there which were released awhile ago. Netgear just released a wireless router and PC Card based on the 802.11n draft spec which was just agreed to.

Wireless Products

I added another few pages tonight. One page covers Wireless Router Manufacturers, while the other page covers Wireless Print Servers Manufacturers.

Both pages list the type of products the wireless manufacturers produce.

The main page for the web site is http://www.interfacebus.com/, and contains additional pages for computers and equipment.

Protection Software

I added a new page to the OEM software section of the site. Currently the page deals with Protection Software, or Anti-Spyware and Anti-Adware software vendors. This page is listed on the
Protection Software page. This page lists all the major Anti-Virus software vendors. The next up-grade will list the Anti-Adware software manufacturers.

The main software page for the site is listed on the Engineering Design Automation software page [EDA Software].

While the main page for the site is listed on the home page; www.interfacebus.com

RS422 Interface

I divided up the RS422 and RS485 interfaces into their own pages. So the orignal page address lists only RS422 informantion; RS422.

The new page address for RS485 information is here; RS485

RS422 [EIA422] defines a differential interface using a single, unidirectional driver with up tp 32 receivers. The RS-422 interface will support Point-to-Point, and Multi-Drop circuits.

RS485 [EIA-485] specifies a bidirectional, half-duplex data transmission. Up to 32 transmitters and 32 receivers may be interconnected in any combination, including one driver and multiple receivers (multi-drop), or one receiver and multiple drivers.

VME Bus

The VME interface still seems to be in high demand. There are a number of pages which deal with the VME bus, and the manufacturers which produce components and equipment on http://www.interfacebus.com/.

The main page that deal with the topic is the VME Bus page. Additional pages include Board manufacturers, Chassis manufacturers, Backplane manufacturers, and a number of pages providing Connector Pinouts.

Switch Manufacturers Listing

I divided up the switch manufactures page into a number of switch types:

[DIP Switch Manufacturers]
[Key Switch Manufacturers]
[Miniature Switch Manufacturers]
[Push Button Switch Manufacturers]
[Reed Switch Manufacturers]
[Rocker Switch Manufacturers]
[Rotary Switch Manufacturers]
[Slide Switch Manufacturers]
[Snap-in Rocker Switch Manufacturers]
[Subminiature Switch Manufacturers]
[Tact Switch Manufacturers]
[Toggle Switch Manufacturers]

The main page for the site is at:
[www.interfacebus.com]

SpaceWire

I moved the information for the SpaceWire interface off the main Avionics Buses page and onto the new SpaceWire Avionics Bus page.

The SpaceWire interface uses a 9-pin cable / connector to communicate in full-duplex over a point-to-point serial communication link.

WireWound Resistor

WireWound Resistor


The chart below depicts the temperature dereating for an Adjustable WireWound resistor. A Wirewound resistor is used in high power applications. The type of Wire wound resistor shown in the picture above is adjustable, but requires a screw driver to move the tape. This link provides Potentiometer Manufacturers




WireWound Derating Curve

Also refer to the Resistor Dictionary of Terms.
How to derate an Adjustable WireWound Resistor.
Additional information may be found on the Guideline for Derating Electronic Components

Home Page

PWB Ground Potential

PWB Ground Potential Graph

This is a graph showing how the ground potential varies as it moves from a single point ground connection. A single point ground connection eliminates potential ground loops. How ever; a single point ground connection also does not provide a good ground potential to all points of the circuit board.

Ground loops cause unintended currents to flow in connections which should have zero current flow. Unintended current flowing in a circuit is called noise, because that current flow was not designed into the circuits operation. Avoid Ground loops or multiple circuit to ground connections in your design.

Many circuits can tolerate the rise or difference in ground potential depicted in the picture. Locate analog devices near the ground strap, and push digital devices away. An Analog IC may require a near perfect reference, while digital devices will tolerate a much larger change in the ground potential. For additional reference data of Printed Circuit Boards, check out PCB Terms and Definitions.
PWB Information

Magnetic Declination Over the World Chart

Magnetic Declination Over the World

This post is in support of the Direction Sensor Manufacturers page.

Direction Sensors are Two-axis or Three-axis magnetic compasses that measure earth's magnetic field.

VoIP Phone

I added a new page for USB IP Phone Manufacturers which handle VoIP phone connections. One way to save long distance phone charges.

PWB Internal Trace I Capacity

PWB Internal Trace Capacity

The chart above shows the amount of current an Internal trace on a printed wiring board can handle. The table provides the current rating based on trace cross section in square mils, temperature rise and current in amperes.

For example; if the trace width is 100 sq mils, that trace can accept between 1.5A and 4 amps depending on the acceptable temperature rise.

There are a number of pages on the web site that cover Printed Wiring Board issues, but these two links point to all of them: Refer to the page covering PWB Terms or
PWB Information

CRT Operation

CRT Function

Internal break-away view of a CRT [cathode ray tube].
Terms and definitions have also been added related to CRTs.

PWB Mimimum Annular Ring

Two views of minimum Annular ring for printed wiring boards. The first graphic is for an internal pad, while the second graphic is for an external pad.

  Internal Mimimum Annular Ring





External Minimum Annular Ring All the terms relating to Printed Wiring Boards [PWB] are now listed on a large one page Dictionary of PWB terms. Also called Printed Circuit Boards [PCB].

For more information on Minimum Annular Ring refer to the definition of Minimum Annular Ring, or see here PWB Information.

The site covers electrical engineering topics.
FYI; The dictionary of PWC and PWB terms has been updated.
.

PWB Etched Copper Current Capacity

PWB Etched Copper Current Capacity

The chart above shows the amount of current an External trace on a printed wiring board can handle. The table provides the current rating based on trace cross section in square mils, temperature rise and current in amperes.

For example; if the trace width is 100 sq mils, that trace can accept between 3.5A and 10 amps depending on the acceptable temperature rise.

Key Phrase:
How much current will a trace handle.
What is the current rating of a trace.
What trace width will handle a certain amount of current.
For more information refer to the page covering PCB Terms. For a large listing of Printed Circuit Card definitions.
Addition PWB Information

Robots/Spiders visitors

Hits from Spiders are not counted in the page counter the site uses. What is interesting is the amount of bandwidth required from these robot hits. I do have to pay for bandwidth.

For the robots listed below, and there are many others hitting the site, the required bandwidth used was; 262.82 MB [Mega Bytes]

Inktomi Slurp: 5213 hits, 27.81 MB of Bandwidth.
Google AdSense: 4306 hits, 61.63 MB of Bandwidth.
Googlebot: 3777 hits, 24.56 MB of Bandwidth.
Unknown robot (identified by 'crawl'): 2223 hits, 28.77 MB of Bandwidth.
MSNBot: 1959 28.78 MB of Bandwidth.
Unknown robot (identified by 'spider'): 1793 hits, 22.79 MB of Bandwidth.
MSIECrawler: 1773 hits, 10.50 MB of Bandwidth.
WISENutbot: 1222 hits, 18.31 MB of Bandwidth.
AskJeeves: 1080 hits, 16.97 MB of Bandwidth.
Alexa: 641 hits, 9.13 MB of Bandwidth.
GigaBot: 580 hits, 8.48 MB of Bandwidth.
Lycos: 303 hits, 5.09 MB of Bandwidth.

http://www.interfacebus.com

Low Page Hits

This is a list of some of the pages that are recieving less than 100 page hits this month. There are other pages, but many are new page address so I can understand that. These pages are older and in some cases contain information in common use so they should be seeing higher numbers..

IndustrialPCI
RS366 Bus
GDDR DIMM
HPPI Bus
HSSI Bus
HIC Bus

IP Cores
Battery Control ICs
knobs
Speakers
MIL-STD-83723.

I can only assume that for some reason these pages have a poor showing on the search engines..