Very large DD coil

[kt315]

meteorites are ferrous. or, did you see gold meteorites?

[Krzychu_]

The coil power circuit in DFX looks like this:


Maximum current is limited by the regulator to 100mA

Regards

[Nandor]

Not the current is the most important, you need Amper and Watt. A small PNP or NPN or Crystal driven oscillator has low power. PI machines with Power Mosfet like IRF transistors have enough power to drive larger coils. The Ground effect is also very important, this coil covers way much ground for a VLF to be able to reject it properly. Search for PI's with DD coil configuration those are the detectors that you are looking for. Meteorites are made of iron and different other alloys, I don't think that you need Disc for that at all.

[Krzychu_]

Hi The power to drive TX coil(s) is not problem. Only original voltage regulator limits the current. I want to search for stone meteorites, so a machine with good discrimination is needed

[Nandor]

Hi
For Whites the largest coil I've seen was the Bigfoot coil 3x18 inch. I think that big as it's in the video is only for PI detectors that have power to drive those coils, Imho no VLF oscillator can drive that large coil.

[Krzychu_]

Hi everyone!
I'm happy that I'm a user of this forum

I would like to make DD TR-IB coil for Whites DFX with dimensions similar to this:

https://www.youtube.com/watch?v=kJaQRGS2SCo&feature=youtu.be&t=45

Is it possible for VLF machine like Whites DFX (It may turn out that problems with EMI, tuning the coil(s), stability, mechanical stiffness of construction and others can not be solved)?

Best regards

Kris