Electronics > Projects, Designs, and Technical Stuff
EMF pickup from amplifier in I2C line causing glitches. (Now with scope trace!)
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Monkeh:

--- Quote ---So thanks to he inverse square law, I can say with fair certainty that random radio transmissions would be unlikely to affect it, because they would have to be very close and/or extremely powerful.
--- End quote ---

And how much are your random radio transmissions affecting other things?


--- Quote ---I would also ask if you think that WiFi routers are poorly designed because they stop working when a microwave is active nearby.  Sometimes you have to accept interference.

--- End quote ---

But that does not mean you're allowed to create it.
georges80:
Re: OP reply #29.

Ok, good luck to you. That post fills in lots of your background thinking (interesting take on product reliability/functionality).

And I've quoted companies to do projects and had to then re-run boards (on my dime) since I found issues with the initial prototype design/layout. That's why when you quote you have to factor in some fudge factor based on your confidence to get the initial prototype working correctly. I also have timelines in my quotes that are achievable or let my customer no if there are any delivery risks. Most of my designs are mixed hardware/firmware. Yes, I've made a living for 10+ years doing various contract designs so have a tiny bit of experience in this area.

cheers,
george.
Starlord:

--- Quote from: Monkeh on July 04, 2016, 02:58:01 am ---And how much are your random radio transmissions affecting other things?

--- End quote ---

I'll answer your question with one of my own:

How many of the millions of products imported from China every year by Americans do you think actually go through rigorous emissions testing processes? 

And just how strong do you think a signal from a device drawing only 2A at 12V is going to be?  I admit, I'm no expert on analog, but I'm pretty sure electromagnetic radiation is electromagnetic radiation, so I think it's safe to say that one can visualize how powerful a transmitter is by envisioning how bright a lightbulb would be when driven with that same current.  And 12V/2A?  That's 24W.  So imagine how dim a 40W bulb is, and then halve that, and take it outside at night.  I've got a hundred watt bulb on my porch and it can barely illuminate my grill 10' away.

Now if you are shipping hundreds of thousands of devices with 40W bulbs in them, then sure, I could see how that might be a serious concern.  I'm shipping less than 100 devices a year, in a sea of millions of untested competing products from China.  And like I already said, I'm gonna be fixing the amplifier and putting a filter on there, so we're good right?  I mean maybe there's some other emissions from the circuit that I have no way to test for, but they're likely to be so weak (the rest of the circuit is 5V) I really don't see the problem.
Monkeh:

--- Quote from: Starlord on July 04, 2016, 03:28:52 am ---How many of the millions of products imported from China every year by Americans do you think actually go through rigorous emissions testing processes? 

--- End quote ---

Other people get away with it so you can too!

 :palm:

Don't hold yourself to any standards or anything.
T3sl4co1l:
Message sent.

Tim
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