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Beginners / Re: What the heck kind of terminal screw is this?!
« Last post by JayMan07 on Today at 02:29:08 AM »
Ok that does look right.  Would the number 1 size be the right size for those terminal bocks?
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Metrology / Re: Low-thermal EMF Solder
« Last post by Simon on Today at 02:27:06 AM »
I'm not an expert in materials and what is and is not allowed in the EU and hopefully remains the rules after the UK leaves the EU so that we have full compatibility with how we deal with such substances. I don't know if cadmium solder under a heat shrink sheath is legal or not. If it is being sold by farnell I presume it is and if TE are making it I am sure they have done their homework as one of if not the largest successful manufacturer in the world of such items (having bought every single piece of competition off of the market).

As I explained its about concentration and handling. The parts you linked to are designed in such a way that the user would not come into contact with the solder. As it is contact with a toxic product that causes the problem then I would assume that in this usage case it is safe to handle. However if you are handling directly wire which is 60% made of cadmium I would expect that the regulations take quite a different view on that. It's the same with anything. Anything can be used for good or bad and many things that if used very badly or with a total lack of knowledge are still useful and required but do require safe handling.

I know that some countries do not have the same sort of rules as the EU and to a degree that is probably why it is cheaper to produce things in those countries. However Europe has opted not to make its own back yard a toxic waste dump or to have workers continually handling toxic materials where it is not strictly necessary.

If you want to talk about cadmium solder then talk about it but all you are doing is arguing with me and derailing the thread you hold so dear.
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Beginners / Re: Buying a ESR meter for In Circuit testing...
« Last post by SeanB on Today at 02:26:56 AM »
Correct, and works well. Adds a bit of capacitance to the unit and a little leakage, but when compared to the expected results it will only make a small difference with any capacitor under 1uF and with an ESR over 1k, so basically does not make any difference to your usual sub 1 ohm capacitor over 100uF. I used 1n400x diodes as they were to hand when i built mine years ago, and it probably will survive albeit the diodes will fail most likely short circuit.
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Dodgy Technology / Re: Please expand this topic to include 'CON JOBS'.
« Last post by rsjsouza on Today at 02:24:50 AM »
Electronic Termites and/or pest repellents - gizmos that are plugged in an outlet and promise to create waves that repel these creattures.

Careful there, some actually do work. E.g. the chemical repellent dispensers that you plug into an outlet - the current powers a small heater that helps the repellent to evaporate and spread. No idea about termites (we don't have those here) but it certainly works with mosquitoes.
That is why I mentioned "waves": the thermal ones work well (although infrared is a wave, it is not the active repellant agent)
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Eagle / Re: The Autodesk Eagle edition
« Last post by Karel on Today at 02:24:49 AM »
Apart from the subscription, which is a no go for us, there's another problem since autodesk took over Eagle.
There are no stable versions anymore. Every new version comes with some bugfixes, but also with new bugs.
You report them, they fix it in a newer version which contains again new bugs...

They don't don't have LTS (long term support) releases. Releases that receive for at least one year bugfixes only and
has highest priority. All new features go into the next LTS release.

It looks like autodesk is aiming at the hobbyist/maker only.
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Beginners / Re: Chipped capacitor (???) on MSI GTX 970 Gaming 4GB
« Last post by wraper on Today at 02:21:20 AM »
I didn't say it "shouldn't be permitted" that people point out what they think is the real problem.  My point was that it has already been pointed out several times, so more posts saying the same thing over and over doesn't get anyone anywhere. It only serves to alienate the OP. Until he replies, I'm not sure why people are adding "yeah, its not that, you'll never fix it" over and over.
Alienate? You sound as if the problem (and therefore fix) becomes any different if different opinions appear in the comments. Same suggestion from several people means there is consensus about the problem and adds more weight to it. Op on the other hand decided that he already knows what's the problem (despite lacking experience) and don't want anything that suggests otherwise. If he had any experience, he would just desolder a cap nearby and measure capacitance. It also should be noted that nobody here owns him anything. So he should be thankful for receiving suggestions solely by good will of others. Yet he became arrogant and don't want to hear what people say.
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Metrology / Re: Low-thermal EMF Solder
« Last post by zhtoor on Today at 02:20:49 AM »
so it is legal to sell the cadmium solder under a sheath.
why did'nt you say so?
i think BG5TOX(xuda) should keep that in mind  :-DD

and by the way, do READ the datasheet in DETAIL.

regards.

-zia
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Projects, Designs, and Technical Stuff / Microprocessor I/O isolation
« Last post by iman_os on Today at 02:19:29 AM »
Hi guys
I want to isolate my STM 32 Microprocessor I/O pins from digital modules like LCD.
LCD digital pins are not using much current but is it necessary to avoid depreciation of Micros I/O which is using for some years or save micro from module fault?

any other comments or recommends woud be appreciated .

 
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Presumably you want simpler and cheaper.  You can get the former, but not both together.  Keep that in mind.

Besides dumb chips like the 555, that aren't specifically intended for SMPS anyway, I recall there's an IR2110 style gate driver with integrated oscillator, that may be of interest.

I don't see how "simple" is a desirable goal, though.  You at least want some protection features: UVLO, peak current limiting, or PWM foldback, or fault latching; maybe output over/under voltage protection and hiccup current limiting too.  These functions require a lot of hardware tacked onto anything simple (like a gated oscillator).  A purpose made controller, for whatever topology you're doing (LLC or otherwise), is almost always well worth the cost.  TI and Power Integrations come to mind.

Tim
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Test Equipment / Re: Ultra phosphor oscilloscope vs DSO
« Last post by nctnico on Today at 02:14:29 AM »
so, the whole thing is just marketing gimmick after all

Not at all. But mr nctnico do not know how these work and what is what.

First do not mix persistence. It is only somehow part of this thing.
:palm: It really is the same. If a spot is hit more often by a signal then that spot will be highlighted more often and thus seem to fade away slower. What you seem to think is persistance is like the ancient DSOs did it: turn a pixel off after a while. But as I wrote earlier: these DSOs are museum pieces. IIRC my Tektronix TDS510A from the early 90's had fading persistence.
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