With adequate heatsinking, it can deliver in excess of 0.5A output current. Typical applications would include local (on-card) regulators which can eliminate the noise and degraded performance associated with single-point regulation.

Datasheet Reference include datasheet, diagrams, circuit schematic and pinouts for the BC547 transistor.

The BC547 is an NPN Epitaxial Silicon Transistor. The BC547 transistor is a general-purpose transistor in a small plastic packages. It is used in general-purpose switching and amplification BC847/BC547 series 45 V, 100 mA NPN general-purpose transistors.

SEO’s, If you wondering why I’m bringing this up, its for a simple reason.  This is one of the parts that I changed the URL and did not 301 re-direct.   In a long tail keyword analysis, it showed clearly that traffic around this part collapsed over the last few days.   Since the content did not change, you can bet this was due to the URL change.

Like I said.  Don’t change page URLs without doing a 301 re-direct.  Here is the evidence you need.   The listing for ATmega16 datasheet fell from position 11 to not-listed.

If I was doing this for money, I should be flogged.  But in this case, it exemplifies part of the experiment.

So, why this post?   Shouldn’t it have been about the importance of using 301 redirects?   Well, yes, but you see I need to plug the part in the blog to get Google to re-acquire the listing.  I’ll keep you posted on how long it takes for Google to do this.

The 1N4148 diode is a fast, standard small signal silicon diode with high conductance used in signal processing. Its name follows the JEDEC nomenclature. The diode 1N4148 is generally available in a DO-35 glass package and is very useful at high frequencies with a reverse recovery time of no more than 4ns. This permits rectification and detection of radio frequency signals very effectively, as long as their amplitude is above the forward conduction threshold of silicon (around 0.7V) or the diode is biased.

In addition to technical characteristics, the 1N4148 diode circuit and packaging options are provided at Datasheet Reference.

The AVR ATmega128 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the AVR ATmega128 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.

In addition to the ATmega128 datasheet, the microcontroller pinouts and schematic are provided.

Blue bars show re-do on keywords in site.   Red bar indicates cutover from HTML site to Joomla site.

Though this part is quite popular, ATmel does not recommend the Atmel 89C51  for new designs.

You can download the ATmel 89C51 datasheet pdf, circuit and some cool projects here.

Today we looked at the keywords that were driving traffic and the rank of the keywords.   Specifically what we looked at were the top target keyword, in our case part number with a correlative term ‘datasheet,  for example, lm317 datasheet.  This particular keyword phrase is listed well on page 2 of google.  It’s generating some significant traffic and so we are leaving it alone.   Of course, we want page 1 but in this case it will take a bit.  This is a very competitive phrase.

However, looking at ATmega128 datasheet, we see excellent page 1 rank but not a lot of traffic (using Google Analytics).   This means one of two things.  Either our metadata that gets included in Google organic listings in not click-worthy or the keyword just doesnt have that much traffic.   All our meta-data is the same format so we are deducing that the keyword just isn’t that valuable.   Time to dig a little.

Using Google Insight for Keywords, we are tested about a dozen correlative terms and recalculated where the traffic is more likely to be.  In this case we found the correlator ‘AVR’ to appear very powerful.   Now, for example, the ‘AVR Atmega128‘ is our top target.  We’ve reincorporated our findings back into the site.

About 50% of our keywords were well ranked but under-delivering traffic.   We revised each of them with new correlative terms and resubmitted the SEO Experiment site to Google.    We also updated the keywords we are tracking and reporting.   One thing we did which you should probably not do – we changed several URLs in the site to include new keywords.   This can cause google to loose the link connection and take users to a 404 error.   You should always use a 301 redirect when you do this.  We have not incorporated the 301 (because we are lazy) and we will probably take a hit on a few keywords that were doing ok but got moved.  We’ll see.

The 7805 voltage regulators employ built-in current limiting, thermal shutdown, and safe-operating area protection which makes them virtually immune to damage from output overloads. 7805 is a three-terminal positive voltage regulator.

With adequate heatsinking, it can deliver in excess of 0.5A output current. Typical applications would include local (on-card) regulators which can eliminate the noise and degraded performance associated with single-point regulation.

7805 regulator comes from the 78xx family of self-contained fixed linear voltage regulator integrated circuits. The 78xx family is a very popular choice for many electronic circuits which require a regulated power supply, due to their ease of use and relative cheapness. When specifying individual ICs within this family, the xx is replaced with a two-digit number, which indicates the output voltage the particular device is designed to provide (for example, the 7805 voltage regulator has a 5 volt output, while the 7812 produces 12 volts). The 78xx line are positive voltage regulators, meaning that they are designed to produce a voltage that is positive relative to a common ground. There is a related line of 79xx devices which are complementary negative voltage regulators. 78xx and 79xx ICs can be used in combination to provide both positive and negative supply voltages in the same circuit, if necessary.

This snapshot shows no effect from removing two covered parts and replacing them.  Since each keyword is tracked as part of a several keyword phrases, this will shortly have an impact and the old pages are discontinued in Google.   About 10 keyword phrases will go to Google-hell.   Traffic-wise, these keywords were generating nothing so don’t dispair.

Here is the stable view of the keyword phrases in rank position:

Day84 Joomla SEO Experiment

Zooming into the page 1 performers shows some more detail.

Day84 SEO Experiment Details

Here are the other salient details:

The site now achieves:

• 3,100 visits per month/ 2,800 uniques
• 5,400 page views per month
• It covers 14 electronic components.
• 8 of the top 10 keywords are different components with fairly even traffic distribution
• The most popular page is the LM317 Datasheet, Circuit Schematic, Pinouts and Sources