How To Restore A 17" Monitor CRT Picture Tube

The first part of the article mentioned about how you can tap from the secondary diode to get the desire output through the 7808 voltage regulator. The weakness of this circuit is that it can’t power up the 17″ Monitor because the power supply have some limitation in delivering current to the bigger CRT tube. The power supply will either shut itself off or power blink. In order to counter this problem, we have to tap voltage from some other places in the Monitor. Unfortunately there were no more places (point) in the Monitor where you can tap the voltage to power up the bigger CRT tube. Due to we could not locate the point then we have to create (design) our own circuit. The best is to use the Monitor flyback transformer ferrite core and with wire loop around the core will produce high pulse ac. This high pulse ac can’t be measure by your normal meter.

With few turning at the core (external loop), you can get a higher ac output voltage to power up the CRT heater. This method only applies if you want to brighten up a Television picture tube. You can’t use this way on Monitor CRT because as mentioned earlier in the first part of the article, Monitor runs on different resolution. The higher the resolution, the higher the B+ voltage supply to the primary winding of the flyback transformer. The higher the B+ voltage, the greater is the voltage output at the secondary side making the output voltage (ac) produced by the external loop even higher. Thus this will make a sudden increase in the filament voltage causing an instant bright in the Monitor raster. Some monitor designed will shutdown if it detect a sudden brightness in the raster.

Even if the monitor didn’t shutdown and if the user decide to lower the Monitor resolution, the raster will suddenly become too dim due to lower B+ voltage. You may ask yourself why computer Monitor has its own 6.3 vdc output and why not like TV, the heater voltage comes from the secondary winding of TV flyback transformer? The answer is because the Monitor designer wants a steady 6.3 volt for filament and don’t want the raster to be affected by a changing in Monitor resolution. In order to solve this problem, after making about 7 to 10 loops around the flyback transformer core, you have to convert this high pulse ac into DC voltage. You can’t simply use any diodes for this purpose. A general purpose diode like the famous 1N5401-1N5408 would not be able to work in this circuit. The high pulse ac voltage will immediately kill the diode once the Monitor is switched “on”. You have to use an ultra fast recovery diode to do the job.

For your information, not all ultra fast recovery diode can efficiently run on this circuit. You have to select the diode type that has a faster speed time like a 50 nanosecond and below. …

What Exactly is RSS and Why is it Good for SEO

News feeds via RSS has snowballed, and is proliferating into everything from personalized websites, RSS readers, news aggregators, and mobile phones.

So what is RSS?

RSS = Really Simple Syndication, it is a way to syndicate your website news, or blog news, or any content for that matter to the rest of the world (all through a commonly defined lightweight XML format)

Originated by UserLand in 1997 and subsequently used by Netscape, RSS has evolved into a popular means of sharing content between sites

What is an RSS feed?

Its XML formatted text, the best way to explain it is to give a simple example as follows;

Feed Name [http://www.website.com/feedname.xml/]
Content of XML feed

A news feed reader reads that XML formatted text file and displays the title and description, the user then links to the site for more information

Who do I submit the feed to?

Once you have made an XML feed file, and put it in a directory on your website, what next ?, well the list of RSS feed aggregators is endless but a good start would be the following websites;

* [http://www.feedsubmitter.com/]

* [http://publisher.yahoo.com/rss_guide/submit.php]

Why is RSS important to SEO?

Because it is yet another avenue to link back to your websites URL and deliver its content to the rest of the web, it will also indirectly help your ranking as the search engines start give more and more credence to RSS feeds.It is also important to remember that once your RSS feed is out there it will be categorized, and grouped together, the search engines like this, it is more meaningful to them and again adds to your website relevancy in that category area. …