http://www.multiupload.com/H3AG7T6OWP
Yesterday finally the weather was fine so I could shoot the video. The plasticbag was hung on a bush after I rubbed it to my hair.
Detection distance is around 1m.
The unit received alot strange signals I couldn't always find out from where they came from. 300m away is a fastway and also a railroad.
But as you can hear in the second clip it also detects a helicopter. On the video it is perhaps just 400m distance, but I could hear it already much earlier - perhaps even 1-2km - directly and with the detector!
It sounds crazy, but it seems I received even some noises from a plane 3km above.
There also was nearby a very large iron object from an ex powerline-pylon fundament. I digged down 80cm a half year ago but left this solid with concrete connected stuff buried there. However, it couldn't detected.
And it made a huge difference how high I did hold the detector. 2m above the ground with reached arm the signals were "bombastic", while the border of detection are around 20-30cm above the ground.
It also made a big difference, if there were trees near or not (more near as 10meters).
Perhaps I'll publish the circuit for improvements because for now it seems not being capable detecting lta objects. But maybe there weren't just any near and iron does not working?
Actually circuit two should only became a very sensitive amp for the ferrite coil, but this still is not done yet.
I had no "concept" how those ferrites should distant detect metal so I focused on the sensitive receiver.
Well, I know how it would work, by very critical adjusted and powerful bfo - but I like to build some extra circuit for this. I guess at the moment the "pure" electrostatic detection still has to be modified.
Or the second possiblity: a long wave transmitting coil and a sensitive receiver where you can hear the frequency or modulation shift if some metal is near!!
It works already with the 100kHz wire-searcher transmitter circuit and some radio receiver but instead of the little ferrite antenna the transmitter should use a large coil. I have two of them, 1 works on 100kHz and the second with 150kHz - and the audible difference in FM reception seems better as AM.
I don't know if the mineoro detects plastic bags (I guess not!) but if there really is electrostatic involved at least it has to be even more sensitive - not only switching on or off style, but more slowly visible power or noise.
However, enjoy these absolutly authentic videos!
@ detectoman
the youtube md is IB design - it's called the "matchless detector" and completly different than mine. And the noise this homebrew makes is terrible!