A video explanation of a vlf metal detector

[Atul Asthana]

From DiodeGoneWild

https://youtu.be/-czOV-hKSlA

[Andi68]

You can also say the soldering points gone wild

[Carl-NC]

While it runs at a VLF frequency (12kHz) it is actually a 1970s basic TR design. Also, the notion that an un-nulled coil offers a more sensitive slope of detection is a misinterpretation of what the curve represents. The slope represents sensitivity to coil overlap, not target response. The target response will be the same anywhere on the curve but will be harder to "see" when the coil is un-nulled.

Edit: I should also say that the curve is drawn incorrectly. I've posted a reply to the video.

[ivconic]

As someone with a speech impediment; I'm definitely the last person in the world to say this: but your accent is really unique, melodic and melodious ... and I didn't understand 50% of what you said, on first listening.

[Carl-NC]

It took me a minute to get used to the "rythym" of his speech, then I had no problem understanding. But I was wondering whether this was a computer-generated voice, some phrases seemed to be perfect replicated.

[Atul Asthana]

Is there an article on this?
Yep, its a TR, with a powerful transmitting oscillator, that putsvout lot of power into the ground. And I guess, thats the reason for the in-the-air performance.

May be the receiver, can be improved to true vlf, with I-Q detection using a garden variety microcontroller and a 16 bit adc sampling of I-Q channels, with all signal processing done by the microcontroller.

But, I guess, I-Q processing may be better suited to concentric coils, as against DD.

Does the receiving signal phase invert in two halfs of DD as against in the common zone?

[dbanner]

If I had to offer a guess, I'd say French Canadian. Bilingual bloke.

[dbanner]

What he stated was that from his observations, the value of the capacitance forming the resonance circuit was ancillary to the type of capacitor used. Obviously a PhD.
He pointed out that the material used in the dielectric impacted on the efficiency and power factor of the circuit. His accent is sublime. An experimentalist, no doubt.

[surfdetector]

If I had to offer a guess, I'd say French Canadian. Bilingual bloke.

He is from the Czech Republic

http://danyk.cz/ja_en.html

[ivconic]

It took me a minute to get used to the "rythym" of his speech, then I had no problem understanding. But I was wondering whether this was a computer-generated voice, some phrases seemed to be perfect replicated.

It sounds great though!