The original Avantel is gone.? The current Avantel () is not related.

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Wikipedia says Axtel acquired Avantel.? Try contacting Axtel, at or .

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Google found a little bit of data about the TFX-18210, in a document from Artisan ().? I think it suggests that they (Artisan) make a functional equivalent to the TFX-18210.? If so, you might look to Artisan for more specifications.

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Andy

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On Mon, Nov 25, 2024 at 01:10 PM, wn4isx wrote:

There are a few things that it doesn't show you.

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(1)? If you are unemployed, your membership rates are cut in half, across the board.

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(2)? If you somehow become elevated to "Senior Member", your membership is free.? I don't know what qualifies you for that level, but I'm assuming it may include your age, plus some length of time as a regular member, which might disqualify you (for a while) if you've left already and want to re-join? But I am only guessing about it.? Also, I'm guessing that the "free" part might apply only to the "groups" (IEEE Societies) that one is a.member of at the time of becoming a SM, which means that joining additional Societies after that point might incur yearly fees.? Again, I stress the fact that I am only guessing about all this and do not know actual details.

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Sadly one typically needs membership in more then one group.

That is especially true as we were discussing access to documents via the "IEEE Xplore" digital library.

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One's ability to freely download a given document, depends on which IEEE Society/Societies one is a member of.? If the article is within the scope of a Society where you are a member, then you can download it.? If not - sorry, no access.

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In all fairness, IEEE does need to pay the bills and keep the lights on.? We can gripe that everything isn't free, but at the end of the day that won't work.

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Andy

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I was starting to think the same thing. Throw a few concepts and let AI do the rest. Though it has been shown that AI generated technical papers are about 10% probable. I forgot the where I found that article, but it was about a month ago it came across my viewing.

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DerekK

I skimmed the first article and can see your points. Not sure what is "opt"-coupling; I could understand "opto"-coupling much better. Furthermore, wavelength tuning... I have a hard time that just the red LED will produce enough to stimulate a solar cell to any major degree as stated.?

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The article also starts out early on with the statement, "However no practical devices were developed in their works." One could probably see why; this is like a cold-fusion paper.

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DerekK

DDK-ICS

Hello , I have the following component shown below which needs to be used as frequency detector.
Is there some datasheet for this component?
I could not find datasheet in google.
/g/electronics101/photo/296358/3858703?p=Created%2C%2C%2C20%2C2%2C0%2C0

A digital audio sinewave generator that uses delta modulation is supposed to have one output only (one MCU pin, for example).

It outputs a delta bits stream which, after filtering, gives a low THD (around 1%) sinewave.

The audio spectrum is, typically, from 20 to 20,000 Hz.

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I asked this question because I work on such generator since about 2 years (though not full time, just in my free time).

I used to call its project ‘Delta Sinewave Synthesis, DSS.

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As most of you know, there is already DDS, Direct Digital Synthesis, generators.

So, if we call DDS a parallel DAC, DSS would be called a serial DAC.

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The goal of my project is to let the hardware very simple. For example, the LPF could be just a passive 3 RC one (3 poles). This is possible if the frequency of the delta clock is made to be much higher than of the highest sinewave one of interest. In my project, it is 2,000,000 Hz (100 times higher than 20 KHz).

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But perhaps I was just re-inventing the wheel :(

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Let's be a little careful about straying into the group's forbidden territory.? ?Just a word of caution, try to be careful.? It's good that there are no outright rants so far.

no sports, politics, or religion on the list

Andy

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BTW, I just saw a review of the new Cad CTS. One option is a 6 speed manual trans!
Dan K

Being an old HP uW SE, the 346 A noise source is 10 MHz to 18 GHz. You get that range for a mere $4000 but it is flat!

Dan Kahn

This issue of QST is available here:

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John?? VE3CXB

For instance, when I heard of IEEE for the first time (many decades ago), I thought they were the World's Light of Knowledge.

Later, when I knew them better, it became natural to me that they have no choice to be so, like it is the case of every privileged rich man around the world (a natural truth revealed already 2000 years ago).? We like it or not, this is how the world is designed :)

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After all, we all here were given a bright human brain to help us solve any problem that we may face and we really need to solve, mainly in electronics, right?

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Not that it matters - and it's waaay off-topic - but in the few places I lived while growing up, we had Fort Knox nearby, and in another we had underground missile silos just up the street from the Boy Scouts meeting house.? So I guess either might have been considered targets by the Russkies.? Yet we had no "Duck and Cover".? Ever.

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But we did know where to go in a tornado alert.? We had one when I was about 5.

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I think the world knew that ordinary consumer companies were making things for defense and space, too, sometimes in private.? That was pretty common.

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Those lists of 300 likely U.S. targets, were probably prepared by Americans.

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I wonder how those "Duck and Cover" things were promoted.? I guess places like the DoD and DOE probably distributed filmstrips and pamphlets to cities and towns, and then it was up to them what they did with them, and for how long they kept up the routine.? Some probably followed them by the letter, year after year, while others may have taken liberties - not precisely ignored it, but decided that the feds went overboard and this wasn't going to help anyone survive a real attack.? I may have lived in places like the latter, because we never had "Duck and Cover".? But the Air Raid siren test was every Saturday at noon.? (Hence the parody, "We attack Americans at noon.? They think it's lunch.")

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After the Cuban Missile Crisis was behind us, it seemed like things cooled down just a bit.? It's silly to think that now, knowing how much nuclear hardware there was (and now is, again).? But the nuclear weapons were only a deterrent, right?? Not something any sane leader would ever use.? (Keyword: sane.)

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Andy

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Hi Paul, these are what I like to use.?

Need to work backwards in any design to the input requirements. How much voltage is the output being driven? What is the start-up current of the motor being driven? Now you can select the MOSFET size. You do not necessarily need a MOSFET that can drive a Tesla motor. Now, think about how much current that MOSFET needs. Do you want to put a series resistor on the gate to help control EMI concerns? If you are over-driving the output of the Arduino, think about inverting the signals and use a smaller MOSFET to drive the gate of the larger one.

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I have spent 30+ years designing stuff from small commercial electronics to motor drivers going into space; plus over a decade in the semiconductor industry as senior apps engineer and market development. If my considerations are not thought of in advance, you will learn that genies inside electronics can be released.;-)

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DerekK

DDK-ICS

As a first approximation, driving a MOSFET's gate means driving into a big capacitance.? The bigger/stronger the FET, the bigger is that capacitance.? It can be quite large, and part of it is from gate to drain where it may be multiplied by Miller effect.

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Driving capacitance gives you (as a first approximation) an RC low-pass filter, meaning that the MOSFET's gate voltage rises or falls much more slowly than the nominal rise and fall times of the driving device if it had no load.

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Hopefully you take that into account.? That is where those MOSFET gate drivers help.

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Andy

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