Circuits for Learning LRL

[Clondike Clad]

Let post circuits to help learn how a LRL works.
Let us LEARN AND TEST. it is the only way we can KNOW.
OK now all who want to teach...Soe of us is ready to build and learn.
Let start with the pick up system...

[J_Player]

Hi Clondike Clad,
The only circuit I have seen for a LRL pickup system is shown in the schematic of Morgan's pistol detector drawn by Max. This schematic looks similar to the kind of pickup circuits we find in some old 2-box detectors. In order to build a pickup circuit, you could start with the pickup circuit shown in the Morgan schematic. From what I can see the missing information for the pickup coil is not too hard because there are only 3 wires that go to the pickup coils. Maybe 2 pickup coils, or a single coil with a tap in it.

If this doesn't work, then maybe you should look for some 2-box schematic to try, or other old metal detector circuit that has a similar schematic to the schematic Max made.

Best wishes,
J_P

[Geo]

Hi J_P.
Do you mean that Alonso used a schematic from a old 2-box detector????
If yes, can you post the schematic here???
Regards

[J_Player]

Hi Geo,
No, I mean the RX part of the schematic that Max drew looks similar to some of the old 2-box circuits I've seen. I don't know of any particular 2-box circuit that is identical, but I see some similarities. Who knows what Alonso used? I see Mineoro has one of the best 2-box detectors available with extra gizmos on it. And I also see Esteban pistol detectors are made from modified old radios and metal detectors.

Maybe a 2-box metal detector would work for LRL if you made it into an omega coil arrangement.

Best wishes,
J_P

[Geo]

Thanks J_P

[Clondike Clad]

Before we can make a LRL we first must know what we are detecting.
First what would it take to pick up the signals from gold,silver and diamonds
What type of test can we do to detect the signals and what is the the signal and what part of the signal is the best to detect.
NASA Space Probes are Real LRL detectors but the keyis knowing what to detect.
So the first thing is to know or learn what to detect. Let us work on this part.

[roberts]

Question of all questions!
Bravo!

[Fred]

Originally Posted by Clondike Clad

Before we can make a LRL we first must know what we are detecting.
First what would it take to pick up the signals from gold,silver and diamonds
What type of test can we do to detect the signals and what is the the signal and what part of the signal is the best to detect.
NASA Space Probes are Real LRL detectors but the keyis knowing what to detect.
So the first thing is to know or learn what to detect. Let us work on this part.

Exactly.How are you going?

I think the best way to discover this is to build a working device, then by looking at its reaction try to discover how it works.
Fred.

[Esteban]

Originally Posted by Clondike Clad

Before we can make a LRL we first must know what we are detecting.
First what would it take to pick up the signals from gold,silver and diamonds
What type of test can we do to detect the signals and what is the the signal and what part of the signal is the best to detect.
NASA Space Probes are Real LRL detectors but the keyis knowing what to detect.
So the first thing is to know or learn what to detect. Let us work on this part.

With a coil, for example, the same as you can see when you detect a small coin but with very low amplitude.

[Esteban]

Based on FM and IR:

http://geotech.thunting.com/pages/me.../US5696490.pdf

[Morgan]

Originally Posted by Esteban

Based on FM and IR:

http://geotech.thunting.com/pages/me.../US5696490.pdf

????

[J_Player]

Originally Posted by Esteban

Based on FM and IR:

http://geotech.thunting.com/pages/me.../US5696490.pdf

Nice link, Esteban! It looks like the IR in this detector is used to relay the signal data to the headphones for the purpose of eliminating the cable, which can be a significant source of noise in a sensitive detector. But it is also intended to move the display close to the search coil to make it easier to pinpoint the target, since you won't need to look away from the coil to see the meter.

What is strange about this detector is it describes locating metal objects by transmitting a VHF FM signal several hundred feet under the ground to locate metal obects. And it has the antenna construction details shown in the patent pictures. There you go Clondike Clad. You now know the target = metal objects, the transmission distance = several hundred feet under the ground or less, the coil details are shown, the frequency is specified, --- all you gotta do is put it together and build a circuit to make it work.

Hmmm... This was patented in 1997. I wonder why we haven't seen any of these detectors in the field?

Best wishes,
J_P

[Clondike Clad]

The passive type of LRL I would Like to learn.
A passive detector is picking up something?
Hung told me his detector will soon pick up diamonds.
I am still waiting for photo of his detector??????
What are the diamonds giving off????
I probe a diamond with IR pickup.emf pickup and Acostical pickup.
NOT, nota ,zero pickup.
I just don't know what to look for.
Hung can you help with this one.
My scope will only go to 100MHZ
RF genertor will go to 1GHZ
METERS UP 100 MEG INPUT INPEDENCE.
Hung I don't want to take your detector ciruit I just want to learn how to detect.

[J_Player]

Originally Posted by Clondike Clad

What are the diamonds giving off????
I probe a diamond with IR pickup.emf pickup and Acostical pickup.
NOT, nota ,zero pickup.
I just don't know what to look for.

Hi Clondike Clad,

I have heard rumors that long range diamond detectors don't pick up the signal from a diamond directly. Long range diamond detectors are associated with picking up a signal from airborne carbon-containing gasses that are given off from deposits left by various ungulates in the vicinity where buried diamonds are located. I am not sure how to build a passive electronic detector that can do this.

Best wishes,
J_P

[Max]

Originally Posted by J_Player

Hi Clondike Clad,

I have heard rumors that long range diamond detectors don't pick up the signal from a diamond directly. Long range diamond detectors are associated with picking up a signal from airborne carbon-containing gasses that are given off from deposits left by various ungulates in the vicinity where buried diamonds are located. I am not sure how to build a passive electronic detector that can do this.

Best wishes,
J_P

Hi,
do you mean the detector sniff ungulates' BS !

Kinda of sniffer thing!

Kind regards,
Max

[Fred]

A detector that detect expensive perfumes molecules could lead you to diamonds too.
I´ve been told it work with paper money and gold too.

regards,
Fred.

[Esteban]

IR light ionizes the air, so in this smal beam is created more "hot" and ionized air. Light acts as an antenna. Imagine this active antenna. IR is very good for electronic LRL, and don't know why more people don' work in this field. The IR light must be modulated. For more precission, no a fixi light in wich you introduce the modulation. You must be modulated open a clossed the beam at the desirable frequency, best two IR leds. This is a King.

[Max]

Originally Posted by Esteban

IR light ionizes the air, so in this smal beam is created more "hot" and ionized air. Light acts as an antenna. Imagine this active antenna. IR is very good for electronic LRL, and don't know why more people don' work in this field. The IR light must be modulated. For more precission, no a fixi light in wich you introduce the modulation. You must be modulated open a clossed the beam at the desirable frequency, best two IR leds. This is a King.

Hi,
but IR are not ionizing radiations as I know... you can ionize stuff using e.g. short UV, x-rays, gamma-rays and other stuff but not IR.

Look here: http://www.osha.gov/SLTC/radiation_n...ing/index.html

Kind regards,
Max