Perhaps. Electromagnets in general are less efficient as size shrinks. May be reasonable to make a single electromagnet targeted for small pieces. However, the magnet structure itself would not be small enough to make into a sufficiently dense matrix for any practical purpose.
Awesome stuff Dave. Love seeing this idea optimized and refined into something much more functional. Prepare for a bunch of comments from crackpots who think this disproves all of physics and also people who think this will revolutionize the gold mining industry and make you billions of dollars 🙄
Hi, I'm Florin and I'd like you to give me some tips because i want to build this. 1. what are the dimensions of the copper washer (diameter, thickness and hole)?. 2 what kind of cable did you wind (thickness in mm, and the number of turns)? 3 where did you get the pieces of ferrite and how tall ,are they or does it work with a longer bar? Do you think it works with magnets on the ferrite demagnetized by heating? 4 do you think it works with a zvs of 60khz? Is it much faster to buy it? 5 What voltage and amperage did you use?
High voltage forum link to my post describing construction of this coil and circuit used to drive it: highvoltageforum.net/index.php?topic=3194.msg22883#msg22883 A few quick answers here: Washer is 19.2mm diameter 0.8mm thick. Cable is 80 strands of 34AWG wire, about 52 turns. Ferrite core is stack of 4 toroid cores, each 22mm OD, 14mm ID, 8mm thick. Ground pocket in bottom core for washer using diamond Dremel tool bit. Cores were from EBay store. No, magnets would not work. Cores are "soft" ferrite intended for AC. Magnets are "hard" ferrite with high coercive force. 60kHz would be inefficient unless you used much finer litz wire (many more strands of finer wire). Used 60Vdc into ZVS oscillator.
For significantly different size coins, coil geometry needs to scale to match. Optimum frequency for a larger coil is lower. Optimum frequency for smaller coil is higher.
I'll be making a high voltage forum post for this project soon. Will include a schematic there and add a link to video description. Closest schematic I have online at the moment is first image of this post: highvoltageforum.net/index.php?topic=916.msg6133#msg6133 But that's for a higher-power Mazzilli oscillator used in my Jacob's ladder, using IGBTs instead of FETs for main oscillator switch parts. Dime magnet is a lower power version using all FETs, and larger inductors to handle low frequency.
This high voltage forum post includes description of coil construction including circuit for ZVS (Mazzilli) oscillator used for it: highvoltageforum.net/index.php?topic=3194.msg22883#msg22883 If questions remain, please feel free to ask again, either here or on high voltage forum.
Yes, it is fun and more relaxing to work on lower-hazard projects at times. Interesting thought. Not likely possible with flat pieces of metal. If not lifted all the way to magnet, would tend to tip vertical, which minimizes eddy current generation. Might be possible to levitate a sphere of appropriate size. Would need to be hollow to keep weight reasonable. Levitation from underneath is possible and not too difficult, as shown in these videos: ruclips.net/video/AHED5xSnnM8/видео.html studio.ruclips.net/user/videofw_iYnzemMo/edit
Yes, aluminum is easiest because it is light. Video shows some pieces of 51um thick aluminum foil. It works great with 1mm thick aluminum too; didn't include that in video.
Plasma globe circuitry is ~8kVac at ~23kHz. Not suitable directly for driving a spark gap Tesla coil. You could try searching the high voltage forum highvoltageforum.net or other web sites for general instructions for small spark gap coils.
Magnetic field of refrigerator magnets is constant. This is an electromagnet powered by AC. Magnetic field alternates polarities 9000 times per second. It's that alternating field which induces current in pennies and dimes. Other key part is copper washer in center bottom of my electromagnet. That makes a low-magnetic-field pocket below magnet, which attracts and holds dimes and pennies.
i watch it at thhe link but i have problems .Do you believe it will work with normal zvs without modify?and it will work with 30awg becaue i dont find 34awg?i find 1,6mm too.and what is the lenght of the litz wire?I can't use a thick wire, if so, how much thick?
With unmodified ZVS for induction heater, might be possible to pick up aluminum foil disk. Not dimes or pennies. 30AWG wire will work, just heat up faster. Since copper washer heating is limiting in my design, a bit more winding heating shouldn't be a critical issue. I made 6 meters (~20 feet) of litz wire, 80 strands of 34AWG. 32 strands of 30AWG should be fine.
Nothing new there from the sound of the magnet that it does you use probably eddy current. It would be something new if it picks up gold without picking up also magnetite by this process.
I certainly agree, this is nothing new. This video is intended to explain how such magnets work and what their limitations are. And this is a reasonably optimized design for dime-sized coins.
That's what I thought before seeing other videos of magnets attracting nonferrous material. Some included explanations to some degree. After understanding the physics myself, made this unit and attempted to explain how it worked more precisely.
I haven't yet thought of any practical uses for an electromagnet that attracts dimes and such. Nothing anyone would pay money for. Even if there were uses, a copyright covers only exact copies, not the general idea. Would be easy to tweak the design enough to get around any copyright I obtained.
@@paulrun111 Yes, I like to share information. But I also make a living researching and designing for a corporation. I'm of course not permitted to share corporate information that I'm being paid to develop.
@@davekni Well, you'd better wise up. I remember clearly years ago; everyone was making the electromagnetic charge transfer to charge batteries and light up light bulbs. Basically, a charged coil emitting an emf charge using a dc current and one transistor. Then years go by, and Apple comes out with wireless charging of your smartphone. Now it is just my speculation. But I feel they got the idea from simple people like yourself and made millions from it. I can think of multiple reasons why someone would want to magnetically manipulate non-ferrous metals. One reason would be to use it as a rail gun to emit high speed aluminum bullets from a railgun. The sky is the limit on creativity and imageability of what to do with such a device. Name that device draw up the schematics and patent that shit asap! That is my 2¢ on this matter.
@@alphanumericskeptic I'm quite familiar with patents. I have 90, roughly half as sole inventor, remainder as joint inventor among others. I didn't invent this nonferrous metal magnet, just optimized a design for specific size of pennies and dimes. Not sure if any other such magnets use a ferrite core, but that's not likely sufficient differentiation compared to iron core to be patentable. Neither is my use of litz wire. These are normal engineering optimizations, not inventive enough.
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That actually works REALLY good for what it is, nice!
Great project and documentation David!
Thank you for the compliment!
BTW, more details are now in my high voltage forum post:
highvoltageforum.net/index.php?topic=3194.msg22883#msg22883
Excellent work - If this coil can be made very small and you had a matrix of them, little pieces could be picked up.
Perhaps. Electromagnets in general are less efficient as size shrinks. May be reasonable to make a single electromagnet targeted for small pieces. However, the magnet structure itself would not be small enough to make into a sufficiently dense matrix for any practical purpose.
Awesome! A kind of reverse-ring launcher.
Nice video sir!
Awesome stuff Dave. Love seeing this idea optimized and refined into something much more functional. Prepare for a bunch of comments from crackpots who think this disproves all of physics and also people who think this will revolutionize the gold mining industry and make you billions of dollars 🙄
Yes. That's why the video explicitly explains why this isn't useful for gold prospecting.
@ they won’t listen lol
Incredible
Hi, I'm Florin and I'd like you to give me some tips because i want to build this.
1. what are the dimensions of the copper washer (diameter, thickness and hole)?.
2 what kind of cable did you wind (thickness in mm, and the number of turns)?
3 where did you get the pieces of ferrite and how tall ,are they or does it work with a longer bar? Do you think it works with magnets on the ferrite demagnetized by heating?
4 do you think it works with a zvs of 60khz? Is it much faster to buy it?
5 What voltage and amperage did you use?
High voltage forum link to my post describing construction of this coil and circuit used to drive it:
highvoltageforum.net/index.php?topic=3194.msg22883#msg22883
A few quick answers here:
Washer is 19.2mm diameter 0.8mm thick.
Cable is 80 strands of 34AWG wire, about 52 turns.
Ferrite core is stack of 4 toroid cores, each 22mm OD, 14mm ID, 8mm thick. Ground pocket in bottom core for washer using diamond Dremel tool bit. Cores were from EBay store. No, magnets would not work. Cores are "soft" ferrite intended for AC. Magnets are "hard" ferrite with high coercive force.
60kHz would be inefficient unless you used much finer litz wire (many more strands of finer wire).
Used 60Vdc into ZVS oscillator.
If you tune it to a different frequency does it perform properly for other sizes?
For significantly different size coins, coil geometry needs to scale to match. Optimum frequency for a larger coil is lower. Optimum frequency for smaller coil is higher.
can you give some details on your drive circuit?
I'll be making a high voltage forum post for this project soon. Will include a schematic there and add a link to video description.
Closest schematic I have online at the moment is first image of this post:
highvoltageforum.net/index.php?topic=916.msg6133#msg6133
But that's for a higher-power Mazzilli oscillator used in my Jacob's ladder, using IGBTs instead of FETs for main oscillator switch parts. Dime magnet is a lower power version using all FETs, and larger inductors to handle low frequency.
This high voltage forum post includes description of coil construction including circuit for ZVS (Mazzilli) oscillator used for it:
highvoltageforum.net/index.php?topic=3194.msg22883#msg22883
If questions remain, please feel free to ask again, either here or on high voltage forum.
Something interesting I can replicate that won't kill me :)
could you adjust the power so that it can levitate the metal?
Yes, it is fun and more relaxing to work on lower-hazard projects at times.
Interesting thought. Not likely possible with flat pieces of metal. If not lifted all the way to magnet, would tend to tip vertical, which minimizes eddy current generation. Might be possible to levitate a sphere of appropriate size. Would need to be hollow to keep weight reasonable.
Levitation from underneath is possible and not too difficult, as shown in these videos:
ruclips.net/video/AHED5xSnnM8/видео.html
studio.ruclips.net/user/videofw_iYnzemMo/edit
You can attract aluminum?
Yes, aluminum is easiest because it is light. Video shows some pieces of 51um thick aluminum foil. It works great with 1mm thick aluminum too; didn't include that in video.
can u do a video on how to make a simple spark gap tesla coil from a plasma globe circuitry for beginners??
Plasma globe circuitry is ~8kVac at ~23kHz. Not suitable directly for driving a spark gap Tesla coil.
You could try searching the high voltage forum
highvoltageforum.net
or other web sites for general instructions for small spark gap coils.
@@davekni thank u! ill be sure to subscribe!
My regular refrigerator magnets won’t pick up pennies and dimes. So is it the strength of the charge that does it?
Magnetic field of refrigerator magnets is constant. This is an electromagnet powered by AC. Magnetic field alternates polarities 9000 times per second. It's that alternating field which induces current in pennies and dimes.
Other key part is copper washer in center bottom of my electromagnet. That makes a low-magnetic-field pocket below magnet, which attracts and holds dimes and pennies.
@ 🙏🙏
i watch it at thhe link but i have problems .Do you believe it will work with normal zvs without modify?and it will work with 30awg becaue i dont find 34awg?i find 1,6mm too.and what is the lenght of the litz wire?I can't use a thick wire, if so, how much thick?
With unmodified ZVS for induction heater, might be possible to pick up aluminum foil disk. Not dimes or pennies.
30AWG wire will work, just heat up faster. Since copper washer heating is limiting in my design, a bit more winding heating shouldn't be a critical issue.
I made 6 meters (~20 feet) of litz wire, 80 strands of 34AWG. 32 strands of 30AWG should be fine.
Nothing new there from the sound of the magnet that it does you use probably eddy current. It would be something new if it picks up gold without picking up also magnetite by this process.
I certainly agree, this is nothing new. This video is intended to explain how such magnets work and what their limitations are. And this is a reasonably optimized design for dime-sized coins.
Preposterous
That's what I thought before seeing other videos of magnets attracting nonferrous material. Some included explanations to some degree. After understanding the physics myself, made this unit and attempted to explain how it worked more precisely.
The corporations are gonna steal your idea and make a device from it. And make millions from it. Should copyright the idea immediately.
I haven't yet thought of any practical uses for an electromagnet that attracts dimes and such. Nothing anyone would pay money for. Even if there were uses, a copyright covers only exact copies, not the general idea. Would be easy to tweak the design enough to get around any copyright I obtained.
Thank you for basically open sourcing this. If more people did this we the people would be a lot better off and more advanced
@@paulrun111 Yes, I like to share information. But I also make a living researching and designing for a corporation. I'm of course not permitted to share corporate information that I'm being paid to develop.
@@davekni Well, you'd better wise up. I remember clearly years ago; everyone was making the electromagnetic charge transfer to charge batteries and light up light bulbs. Basically, a charged coil emitting an emf charge using a dc current and one transistor. Then years go by, and Apple comes out with wireless charging of your smartphone. Now it is just my speculation. But I feel they got the idea from simple people like yourself and made millions from it. I can think of multiple reasons why someone would want to magnetically manipulate non-ferrous metals. One reason would be to use it as a rail gun to emit high speed aluminum bullets from a railgun. The sky is the limit on creativity and imageability of what to do with such a device. Name that device draw up the schematics and patent that shit asap! That is my 2¢ on this matter.
@@alphanumericskeptic I'm quite familiar with patents. I have 90, roughly half as sole inventor, remainder as joint inventor among others. I didn't invent this nonferrous metal magnet, just optimized a design for specific size of pennies and dimes. Not sure if any other such magnets use a ferrite core, but that's not likely sufficient differentiation compared to iron core to be patentable. Neither is my use of litz wire. These are normal engineering optimizations, not inventive enough.