Relay Derating

I just notice that the page covering How to Derate a Relay was never listed in the blog when it was added to the web site. Looks like the page was added back in March, or at least that was the day of the first page view.

The page doesn't get that many hits, just a few a-day. I went ahead and added a new link at the top of the page covering Manufacturers of Relays. Then I did the same thing to the page covering Manufacturers of Mechanical Relays.

I also removed two manufacturers links, one looks like it went bad and the other appeared to be a relay distributor. Also added a picture of a relay.

The three pages covering relay manufacturers have dropped 50% over the last three years. Seems odd, as the relay pages come up as number 1 and 2 on a Google search for relay manufacturers....

Sony's DMP Interface

I added a new page the other day to cover the Digital Media Port [DMP] interface. The bus was developed by Sony and only resides on their gear. The page lists one possible pin out, and I don't know if there may be others. I have no other information on the interface.

Digital Media Port

The page is linked from these two pages;
Engineering Interface Buses, 'D'.
Cable and Backplane Buses.

Because this bus is only being used by Sony I may not be able to find any additional data.

Cable Harness Design Considerations

As part of the design section on how to design an electronic chassis, a page was added to cover Cable Harnesses. Or additional considerations to account for when you require a cable harness within a chassis.

When to Tie wrap a cable, how often a tie wrap should be used along a length of cable and additional issues not covered on the original Specifying a Cable Assembly page. I will be adding a sub-section on splices to cables on that new page as well.

Other pages that were recently added include;

Equipment Data Runs; covering Possible Data Rates. 8/11/09

Equipment Rack Grounding; covering How to Ground an Equipment Rack. 7/31/09

Industrial Rack Mount Computers; covering

....... Rack Mount Computers. 5/21/09

....... Cable Retracters. 5/21/09

Designing an Equipment Chassis; covering

....... Chassis Wire Selection. 4/29/09

....... Chassis AC Module Selection. 4/29/09

I don't see any other new additions to the chassis design section in this blog. Of course pages get updated all the time. Here are some key phrases;

How do I know where to tie wrap a cable.

How often do I tie wrap a cable.

Can I put splices in a cable harness.

Equipment Cable Runs

A new page was added to the section on How to Design an Equipment Chassis. The new page covers Cable Data Rates vs. Cable Length. Of course it's a new page that was only added over the week end; but, it does have a nice graph that shows Cable length vs Data Rate.

Now there's not a big calling for cable length data within a 16 inch chassis, but this section does cover rack gear as well. So rack to rack cable length could be a concern. Also the new page will support articles on Cable Assemblies and other pages relating to rack and chassis cable selection. So the page may not be all that relevant to chassis design, but it can't hurt. Plus soon other pages that do relate to cable length will soon be pointing to it, so it should be a nice addition to the web site once some data and text is added to it.

The group of pages that make up the electronic chassis design consists of about 50 pages.
Worst performing pages; looks like a tie between two pages;
Rack Mounted Temperature Alarm Units.
Rack Mounted Air Flow Alarm Units.

IC Package Styles

A new page was added to cover the Thin Quad Flat Pack IC Package; TQFP Style.

It is one of a number of pages covering IC package styles. The two main sections cover Surface Mount packages, and Through-Hole packages.

Many of the individual pages relating to Integrated Circuit [IC] packages were also up-dated or optimized. A number of pages did not have captions for the graphics or HTML 'alt' tags to indicate what the graphic or picture related too.

Related pages; Diode Packages, Transistor Packages.