Some REALLY powerful MD !!!

[Funfinder]

I know, this is here like throwing pearls in front of pigs or
as if some slaughter would talk with a vegetarian *laugh*
but just for a moment throw your ressentiments away
and think about it:

How would it be to drive a metal-detector by 110 or 230 Volts ?!

Would the 50-60 Hz already work directly as search-frequency?

There exists portable gas-motor-driven generators which provide this voltage.
Per instance from Honda. 300 watts or what the smaller ones have (3-4 kg).

That most of you here with your 5-25 volts toys are the wrong clientel
is clear - you must not tell me - we would need middle-range-voltage-
engineers and also more stable electronic parts to achieve this.


Why don't built all those "super fantastic" ;-) (not bad meant) metal-detector
tinkerers their devices not so it can be powered by a 1,5v battery?
Just because of the rest besides the coil?

Don't fool yourself and show me that highly noize-ratio contrastful
EM-field you are able to create with some 1,5v battery! *laugh*
This was meant ironical if you haven't understand it in the 1st place.

1,5v is NOTHING concerning reaching real depth and I doubt that 6v or
12v is much better, because I know the depths this voltage can reach.

Anyway, I just wanted to show you what might be possible.
Because I highly doubt it that just one single person in this meanwhile
totally abandoned forum will have the guts or knownledge to deal with
higher power!

btw. one of the best long-range-metal-detectors is the flash itself!
The electrical discharge from a thunderstorm !!!
And it does not have just 1,5 volt! Hahahaha !!!

[Prospector Paul]

Is there a detector that uses such low frequencies? I haven't heard of any. I would try to stay clear of power line frequency or their harmonics. Electrical current is what produces the electromagnetic field around the coil. How much voltage you need depends on the coil. I've had designs that produce close to 200 watts, most of which goes to the coil as joule heat. It's easily to produce more, but you would need some hefty batteries or do a lot of battery swapping.

[Carl-NC]

FF, it so happens I'm designing a detector that runs on 110/220v. A walk-thru, actually. But it runs at 2400Hz, which is a multiple of both 50 & 60 Hz.

Previously, I worked on a PI gold detector that ran on 200v. Worked just fine. The high voltage isn't a panacea, it has benefits but also drawbacks.

Another current project runs at 4v, 16v, and 64v. All at the same time. The possibilities are endless.

[Funfinder]

Wow, Carl, this is amazing to hear. Good luck for this project.

I guess the main problem is that high power-voltage already magnetizes
the ground like some electro-magnet (however such one has to be DC).

But with larger coils and per instance at desert regions or with lime-stone rocks
it might be THE solution to built a really deep detector without much changes
to the usual circuit designs.

All whats needed are electronic parts which can withstands some watts
and volts - btw. many mains-adapters are containing such ingredients.
Same as the ATX power-module for computers.

The portable powersource would be a backpack with small gas-generator inside.
Or a longer cable for the garden-treasure-hunt. *laugh*

[nonkapo]

What about the safety concerns? I just recollect anecdote about a guy doing fishing in the middle of the winter. From 10 fishermen he was the one picking up fish every 5 minutes. The others being jealousy come and ask him what does hi fix on his hook. He answer -worms. And how do you dig the worms in the frozen soil they ask? He answer that two electrodes in the ground and 220 volts make the worms get out.
A week later one of the fishermen come, having a lot of blunt force trauma as from a battle. When everyone ask him what happened, his answer was:
My bad, instead of 220volts i put in the ground 22kv and when the miners come out....so the consequences.
Sorry for the off topic but i cant withstand.

[dbanner]

Ha ha. Good one.
Voltage is so misunderstood. Voltage or potential difference or electromotive force does not by itself create electromagnetic field, but current flowing through conductive material does. So if you are good engineer, you can make useful device at higher voltages depending on application or intended use. Using multiples of 50 or 60 Hertz is obviously sensible. Why not use a giant Tesla coil to send intra galactic pulses, sort of like a beacon to earth.
Funfinder can be lead engineer on such a project.

[Funfinder]

Very amusing. *laugh*
First I thought that the fisherman was using dynamite! Hahaha.
Or high-voltage electro-shocking the fishes until they swim bottom up.

Well, of course the coil cable should be good enough isolated.
The coil too and the coil connector has to be more safe.
Tesla coil ??? I've bought already 3 Plasma-globes to experiment
with on or two of them. You can put some alu-foil-cap with an "ear"
onto them and make ultra-thin skin-brandings with it. *laugh*
While it produces ionized ozone-gas and melts little holes into the
glass-ball if you are not careful.

https://en.wikipedia.org/wiki/Plasma_globe

But for metal-detection? Naah, that won't be useful and good enough.

There exists already detectors or better said "geotech"-devices with
seperate receiver- transmitter units - 50 meters apart - and if some
metal is inbetween of them the sensitive detection-unit makes BEEP.
Of course the transmitter needs a little bit more power to create
eddy-currents inside of a larger metal-deposit which is at 25 meters
distance. This whole coil-impedance shifting just has to work more
powerful and while: coming back and going out to the same location.

Today with modern bluetooth etc. it also would be possible to put
4 strong transceivers into the corners of a 50x50 meters field and
while walking around, the detector interacts with them wireless
and caluclates at what distance what reception coil-impedance
should occure - if there is no metal. This is the exclusion-method
because if the value no longer is the same as calculated, there is
some ground-anomaly or distortion - caused by a large and deep
metal object or whatever.
With 4 transmitters instead of just 1 or two, the detection-results
of course can become much more better.