Questions Doc: https://docs.google.com/spreadsheets/d/19bZ6CqzGPlrbwcTaaXK_Mt0NeD2cc1AXOPVKKPWIkxw/edit#gid=0
Jeremy So I'm a mechanical engineer by day, and tinkerer by night. Currently leading prototype efforts on the mechanical side at Nanomagnetics. Free time currently is being taken up by autocross, but I have a few side projects I've been kicking around to pick up when I have the time as well!
What kind of side projects?
So the last major project I was working on was making my own headphones.
Cool, did you design your own magnetics for that?
Unfortunately no, mostly it was more of a mechanical side project, but I did liberate a pretty sweet planar magnetic driver from the T50RP's as a base for it
Excited to learn about more usecases for magnets
Jeremy @Anil Pattni ask away!
We have a question here on the doc: Researching about magnetic waves, not sure if you know about the magspoof device from Samy Kamkar. A device which implements a coil to transmit magnetic waves using certain format to be interpreted in the card reader, my question is do you know another way to generate that kind of waves but with using something different than a coil?
aren't those called "electro-magnetic waves" and usually generated with an antenna?
nopes, not there - it's a huge coil on an attiny, if I'm not mistaken
it's to fake magnetic card swipes
@Shulie Tornel is implying that it's all near-field.
Yeah, but I think
I haven't taken a look at this magspoof device before, but off the top of my head, if you want to generate a strong magnetic field you'll want to run it through a coil
@Lutetium@Jeremy are you using magnets for any of your projects?
magnets on a disc - spin the disc infront of the reader
how are the curved magnets made?
and when they are sold in pairs, do they have exactly the same amount of magnetism?
@Anil Pattni Currently working on a magnetic connector, it's designed to do USB 2 between devices
as for how magnets are made, they're typically sintered in the rough shape you'd want
Nice, If I placed magnets at specific intervals on two discs placed on an axle and applied a small current, would they continue to rotate on their own?
as far as strength, if you could control the process so that the magnets were precisely the same size and had the same compositon yes, they would but due to manufacturing tolerances they will differ slightly. But for the majority of cases you can treat two magnets with the same size as having the same amount of magnetism
@Anil Pattni Yes and no, what you'd want to do is apply a current to attract/repel the next magnet. and then turn it off. This is ends up being the basis of a DC motor. You can actually experiment with a magnet, some magnet wire, and a battery to make a rudimentary motor this way
@jeremy That's so cool, I like the apple magnetic connector and that their available for microusb too smartphones, I'd really like the practically of them for phones because we're always connecting / disconnecting
@Anil Pattni Re: your axle question. I'm not sure what you are describing, but have you looked into homopolar motors? Plenty of videos on Youtube. Takes about a minute to prototype a demo with materials you already have on hand
e: the curved magnet, does the amont of magnetism (what is that called ayway?) change due to the shape? or just the volume
@Anil Pattni That being said you'll want to run the current through a coil to generate a large enough magnetic field to have an effect on the magnets to continue their motion
re: the USB 2 magnetic connector, do the magnets affect data transmission at all? would connecting/disconnecting cause noise?
@Jeremy so if we use the face of a clock to describe positions, would magnets be at 1,3,5,7,9,11 on one...
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