So I get how changing the E field generates the B field, and vice versa and how that lets us create electromagnets. I even get how SR explains the changing reference frames so that what's a B field w.r.t. one coordinate system could be an E field w.r.t. another coordinate system. What I don't get is how "classical" (for lack of a better term) magnets come in. What's the reference frame where a bar magnet actually generates an electric force instead of a magnetic force?
I know magnetism in "classical" magnets and things like iron is due to the spin of electrons and if "spin" in QM actually meant "spin" in the usual sense, it'd made perfect sense how this is ultimately the same thing as how electromagnets work. But it's been emphasized to me MANY times that the "spin" of a particle does NOT mean the particle is actually spinning, but instead spin it's own separate property that doesn't have a classical analog. OK, so then how does it have the same effect on the E field at an atomic level as macroscopic movement does to the E field on a macroscopic level? To be clear, I'm not disputing that "spin" doesn't mean the particle is actually spinning. I'm just very confused about a force generated by some mysterious quantum property with no classical analog is the same as the force generated by electromagnetics.
I was shockingly surprised to see how good these things were, compared to 99% of any other magnets that I’ve ever had this thing by far outweighs anyone of them. So good that I’ve jokingly considered carrying one on my side with me to disarm anyone that would try to mug me at gun or knife point lol.
Sorry if this is the wrong sub, didn't know where to ask, if Im wrong here, please be so kind to direct me to the right place.
In case I'm right here. Has anyone of you made one of those magnetic wall mounts for your knives themselves? If so, which magnets did you use and how far away from the knives can they stay? I'd like to make one myself, but there's so many different magnets, I'm not sure what to use
I acquired a second harp to mess around with (OS, probably 60s-mid 70s Appalachian), and the original owner had installed a bar magnet pickup, but it doesn't work anymore. I have a soldering iron and a can-do attitude. But I can't find any info online about how these things are constructed. Anyone got any (ha) leads?
First, I'm the bassist, but end up taking on all the "tech work" like this in our band.
Pic of slanty-boii for reference
So our guitarist has a Jackson 7 multi-scale, i forget the exact model name/number. Great guitar, only problem is the stock pickups seem to be insanely prone to howling feedback at our practice space. Not even a noise gate jacked way up will stop it, the howl is still present underneath while playing. None of his other guitars are nearly as noisy, a few with EMG actives, even the passive humbucker loaded ones are far more manageable at keeping the howl away. I've even rewired the controls from scratch to eliminate a ground loop that was in the stock wiring.
So, let's try some better pups in it, right? Problem is, the pups are mounted at an angle due to multi-scale. I figure a normal pup with pole magnets would be less than ideal, so started looking around for a bar/blade magnet passive pup for a 7.
Not much luck finding anything so far, nothing from Seymour Duncan or Dimarzio that I'm able to find. EMG 81/85/60 are a last resort, he would prefer to stay with passives on this guitar.
Any leads on this?
Just want to know, could I just substitute the bar magnet and slugs/screws with magnetic pole pieces on a humbucker without changing the windings or anything?
I would like more clarity and string seperation and still no hum, don't care much about "It sounds like a humbucker" or not.
I have a new Lola and I’ve noticed that there’s a factory-fitted bar magnet which sits under/close to the rear axle.
How do I remove this? There aren’t any screws... does it just push out?
I'm desperately looking for a magnetic bar pickup for my autoharp. I just want something I can tape down on the outside and not have to drill through anything. I don't care if it's unsightly, I just want to get the sound right. I don't think they make Oscar Schmidt ap442 pickups anymore, do they? I can't find one anywhere (even used), but it seems like it would have been so perfect for what I need. Does anyone know where to find one or something similar?
The only other magnetic bar pickup I've seen anywhere is through Daigle autoharps, but theirs requires soldering and just doesn't seem like a "tape it down on the outside and play" kind of thing.
I wanted to go this route because I've been trying various mic setups and I'm just getting too much feedback with the reverb and delay effects I like to use.
Any advice would be so appreciated!
I am looking for a magnetic tool bar to stick to the inside lid of my US General tool cart. All of the ones I am finding (such as this one https://www.harborfreight.com/18-in-magnetic-tool-holder-60433.html) have a magnet on one side (only) and need to be screwed or bolted to the surface where it will be mounted.
Does anyone make a simple magnetic bar that can stick to a metal surface, such as a tool cart, to attached tools to?
Thanks.
Hi guys, I have a stupid question for a stupid situation I’m in. I’ve recently dropped a mosfet in a very hard to reach area, and I think my best bet is to grab it with a magnet. I just want to make sure I won’t damage the mosfet in anyway by using a magnet. The MOSFET isn’t connected to anything so it won’t have electricity running through it.
