Electronics > Projects, Designs, and Technical Stuff

EMF pickup from amplifier in I2C line causing glitches. (Now with scope trace!)

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CJay:
*snipped more whinging about how unfair the world is and justification of illegal actions because 'bigger boys did it first'*

Yeah, you go for it, can't wait to hear how the compliance testing goes.

Oh.

You've been pursuing this project and begging tech advice, relying on the charity of others then arguing against them when they've pointed out where you are in the wrong.

I admire your determination to bring this thing to market but there are times when you have to grab your balls and accept you might just be wrong.

You *really* need to understand a *lot* more about what you're inflicting on the world, I doubt very much you will be only interfering with CB radios, there are emergency service, military, civil aviation and many other users of the HF bands that you're merrily polluting, you claim that speeding is less morally acceptable than the risk of blanking communications by those users?






 

Starlord:

--- Quote from: CJay on July 06, 2016, 11:34:12 am ---*snipped more whinging about how unfair the world is and justification of illegal actions because 'bigger boys did it first'*

--- End quote ---

You also snipped the bit where I said you were in no position to judge me because you yourself break the law on a daily basis.

Starlord:

--- Quote from: CJay on July 06, 2016, 11:34:12 am ---You *really* need to understand a *lot* more about what you're inflicting on the world, I doubt very much you will be only interfering with CB radios, there are emergency service, military, civil aviation and many other users of the HF bands that you're merrily polluting, you claim that speeding is less morally acceptable than the risk of blanking communications by those users?

--- End quote ---

Over 32,000 people die on the roads each year.  I challenge you to find a single instance of radio interference resulting in a death in the last 25 years.

Also, do you really think military radio communications can be jammed by a tiny device powered by a 12V battery?

dmills:
You should really be plotting the voltage across R1, not that it really changes anything, and yes radians in that datasheet means radians per second.

There other ISM bands besides 2.4G you know, the need for space to use for RF heating predates the microwave oven, 2.4G was used for early domestic wifi because it was the widest ISM band for which cheap RF semiconductor components were realistic at the time (And resonant aerials there were small enough), if 2.4 had not been available then within a few years the 5GHz band would have looked reasonable. Some of us used to do wifi (We called it RTTY and Pactor) down in the HF bands, 13.56MHz ISM could be used, but the aerials become a little annoying down there, and the available baud rate is not wonderfully high.

Incidentally, the door seals on a modern microwave oven are a wonder of **really** clever design (A cavity forms a quarter wave short stub, a half wave back from the edge forming a high impedance at the edge, all made from really cheap bent tin), and the door switch (a safety critical component) is a very clever thing in its own way, low cost and absolutely fail safe.
Cost down is often more of a case of really clever design then blowing off the regs.

Regards, Dan.

Starlord:

--- Quote from: dmills on July 06, 2016, 11:52:02 am ---Incidentally, the door seals on a modern microwave oven are a wonder of **really** clever design (A cavity forms a quarter wave short stub, a half wave back from the edge forming a high impedance at the edge, all made from really cheap bent tin), and the door switch (a safety critical component) is a very clever thing in its own way, low cost and absolutely fail safe.

--- End quote ---

That's cool, and clever it may be, but it's still not perfect. At my sister's place, whenever they use their microwave, the WiFi goes down. It's a pretty new microwave too, and there was no visible damage to the door that might have caused leakage. 

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