DIY METAL DETECTOR, Gone Wrong and Right!!

With few incidents, I think I made what is called a BFO metal detector, which actually works very well over a large distance.

Below are my Super Patrons with support to the extreme!

Sam Lutfi
Zoddy
Ambiance Domotique

By: Mehdi Sadaghdar

0:00 Wrong Way of Detecting Metal
1:48 Theory Behind How Metals Effect Inductance
6:10 More Fake and Real Metal Detector Video Tutorials
7:32 Designing a “Simple” Metal Detector Circuit
15:48 Testing the DIY Metal Detector Circuit

[ElectroBOOM]

YO! I'm still waiting to HEART a comment! in the meantime, ALUMAGNETIC FOREVER! Paramagnetic, diamagnetic or antimagnetic properties of non-ferromagnetic... sorry, ALUMAGNETIC metal are very week magnetic properties observable in DC fields, which I don't care about. They are overshadowed by MUCH greater Eddy Current magnetic forces in AC. ALUMAGNETIC focuses on great AC forces of whatever that is not ferromagnetic!

[Michael-OBrien]

05:16: The core splits itself apart because the flux lines pass through each laminated layer. Since there is a gap between each layer, you end up having the said layers behave like like-oriented magnets, thus they repel each other

[andie_pants]

The hobby shall heretofore be called _"metal detectoring"_ and I will be taking no questions at this time.

[Geotech-nfzw]

Mehdi, you did a fantastic job, covering 2 types of metal detectors (energy theft and BFO) in just 20 minutes, with no loss of fingers or eyesight. Well done, and thanks for the shout-out. As for the cross-coupled transmitter, I've used that in a metal detector design (White's TRX) and did not use any bias resistors on the transistors. You should not need them.
On the transformer plates, they push apart because the eddy current generated in each plate (across the thin cross-section) interacts with the coil's magnetic field to produce a force which is the cross-product of the two, and is perpendicular to both. This means that at the surfaces of the plates, the forces oppose each other and try to push the plates apart. Hard to explain in words, easy to illustrate. Any decent EM book explains it. A dangerously impressive example of this force can be found in coin shrinkers, where a sufficiently strong EM field creates enough radial force to literally shrink a coin. If you were to do a video on coin shrinkers, I would not dare to wager that you have 10 fingers at the end.
Edit: I couldn't remember the name of the force so I had to look it up: Lorentz force, where F = J x B (cross product).

[pramodasr]

I love how when I was a kid being fascinated by his knowledge in electronics and thinking he's a man of magic and now that I'm studying my bachelor's in electronics understanding everything he says and recognising circuits. When I look back I see I've grown a lot and will also be a magic man to future generations

[birbo]

Does this count as one of electroboom’s hair-raising electrifying shocking adventures?

[KingSlayer_]

It’s crazy how smart Electroboom is but still keeps it funny with the fails and stuff.

[niketsnews]

0:57 if you're lucky enough to stab some metal,
Elecroboom : oh sh*t
Me : your light bulb will blow right off.

[BiaginiMatt]

Mehdi, this was one of your best videos in a long time!!!! Is so amazing to see the electronic circuit forming before our eyes and see all the logic behind it and the reason for each component!!!! Do more content like this one

[justadam]

WOW! This video was incredible. It started out with your usual style, but going more into it, you demonstrated how educated you are and became on the topic and in the field of electronics.
I love how you were able to walk through every step in the process of designing this circuit: Research, testing, refining, etc. To make something resembling what you see in stores all around the world. And still made it digestible enough for me and a lot of other people understand. You show all the complex stuff, yet explain it simply, catering to both audiences.
I absolutely love your content Mehdi! ❤️🇮🇷❤️🇪🇬❤️

[anujsarode]

For 4:56, due to the core having multiple individual pieces, each producing its own magnetic field in the same direction, it makes them repel each other. Maybe that's why core pieces are tightly stuck together to avoid vibration due to repelling.

[ojooluropo]

Mehdi, you did a fantastic job, covering 2 types of metal detectors (energy theft and BFO) in just 20 minutes, with no loss of fingers or eyesight. Well done, and thanks for the shout-out. As for the cross-coupled transmitter, I've used that in a metal detector design (White's TRX) and did not use any bias resistors on the transistors. You should not need them.
On the transformer plates, they push apart because the eddy current generated in each plate (across the thin cross-section) interacts with the coil's magnetic field to produce a force which is the cross-product of the two, and is perpendicular to both. This means that at the surfaces of the plates, the forces oppose each other and try to push the plates apart. Hard to explain

[TimInertiatic]

Sometimes, the explosions make you forget how intelligent this man is 🤓

[rawinder]

I love all of your videos, but for some reason this one really stood out. Watching you develop different circuits, showing them and then improving on them taught me a lot on the development process. Thanks!

[Pwrds]

15:49
Mehdi you made a Geiger counter 😂😂😂

[eepohce]

You sir deserve your own Netflix series. I have been entertained all day watching your videos. You are genuinely likeable.

[dman]

I love how you've shown the process here. A complicated electrical circuit is, fundamentally, a bunch of sub-circuits stuck together. It sort of reminds me of a project I did in undergrad, and I solved each step in the signal chain by reading The Art of Electronics to get the signal processing right!

[MrEsuoh]

It's actually crazy how much this kind of field of work relates to music/sound design with basic waveforms. Even the terms used are the same. Math really does connect everything.

[dragan]

This feels like the classic electroboom type of content which I love. It's chaotic enough, it's got simple educational parts for us non-EEs, it's got some damn massive schematics that give me flashbacks for those that understand them and there's a complete working project at the end, love it

[karkaddxgaming]

1:28 Detector showed us that Mehdi is made out of metal.