Action of the Earth in solenoids

[Esteban]

Thank you Esteban.
Maybe next week to have time to try it
My regards

Maybe you have saved the constructional of aluminiun loop and core. This I post time ago, but here repost.

Regards

[Max]

Maybe you have saved the constructional of aluminiun loop and core. This I post time ago, but here repost.

Regards

Hi Esteban,
I saw this picture from you... posted on page 2 of this thread...

Now... I know that circuit cause was employed in a pinpointer stuff (russian schematic based on that magazine too, I think first time I saw it was around 1989, is that possible ?) but know for use in pinpointers not LRL. I remember there's a lowered amplitude when e.g. iron is near...

Now this that's really surprising to me... see that stuff used for LRLs too I mean! It's very basic circuit , kind of hartley osc...

Which kind of signal variations you read in presence of a gold target ?

And which is the range you noticed from it LRL behaviour in relationship with which target/size ?

Kind regards,
Max

[Esteban]

Hi Esteban,
I saw this picture from you... posted on page 2 of this thread...

Now... I know that circuit cause was employed in a pinpointer stuff (russian schematic based on that magazine too, I think first time I saw it was around 1989, is that possible ?) but know for use in pinpointers not LRL. I remember there's a lowered amplitude when e.g. iron is near...

Now this that's really surprising to me... see that stuff used for LRLs too I mean! It's very basic circuit , kind of hartley osc...

Which kind of signal variations you read in presence of a gold target ?

And which is the range you noticed from it LRL behaviour in relationship with which target/size ?

Kind regards,
Max

This is not the only circuit. This works as resonance off. Amplifier circuit uses a LM358 and 4066. Also a radio and beeper, so is 2 detector in one.

Distance for small things can be 5 m, a treasure can be detected at 30 m.

I don't read nothing, I hear the beeps!

[Max]

This is not the only circuit. This works as resonance off. Amplifier circuit uses a LM358 and 4066. Also a radio and beeper, so is 2 detector in one.

Distance for small things can be 5 m, a treasure can be detected at 30 m.

I don't read nothing, I hear the beeps!

Hi,
yes... but you provide data for coil... but not the other stuff...

Don't understand why you post coil data and then nothing else... so the thing you posted is just an oscillator !?

So... why ?

Ok, your choice... but that's not easy belive it can be used with success in real, working LRL... it's really low power... and not "state of the art" about stability.

I think people will belive in LRLs if a REAL and COMPLETE schematic will be posted... and anyone could replicate and check if works or not.

Don't need 30 meters or 5 meters range... also 50cm for a coin could be enough to show people if device works or not... but that needs you post something complete... not pieces.

Kind regards,
Max

[Geo]

Hi Max.
As Esteban wrote it is a circuit from Andy Flind. I have the schematic so Esteban gives me info about the coil. But i like the open loop.

Esteban, if i will not use the radio, at who distance may i locate a big object?? other can you tell me how to connect the radio to the magnetic field detector???

Regards

[Esteban]

Hi Max.
As Esteban wrote it is a circuit from Andy Flind. I have the schematic so Esteban gives me info about the coil. But i like the open loop.

Esteban, if i will not use the radio, at who distance may i locate a big object?? other can you tell me how to connect the radio to the magnetic field detector???

Regards

The oscillator and Andy Flind's circuit are different things!

Maybe 30 meters... The input reductor in circuit (2K2) you must reduced for better sensibility.

[Esteban]

Geo

Also, can be via trafo:

[Esteban]

Maybe admins can obtain permission of EPE for to post this:

[Geo]

The oscillator and Andy Flind's circuit are different things!

Maybe 30 meters... The input reductor in circuit (2K2) you must reduced for better sensibility.

Hi Esteban.
Thank you.
Some questions yet.
Does The antenna of radio must connected to c1 or must be a wire near the loop???
I suppose that i must use different power supply for radio and MFD.
At who frequency must tune the radio???

My Regards

[Max]

Maybe admins can obtain permission of EPE for to post this:

Which was original purpose of this circuit ?

Magnetic anomaly detector ?

Kind regards,
Max

[aft_72005]

Maybe admins can obtain permission of EPE for to post this:

Hi Esteban

Please say me what number and year published this article ?

Best regards.

[Qiaozhi]

Hi Esteban
Please say me what number and year published this article ?
Best regards.

It looks like January 1995, but I cannot be absolutely certain about the year, as the resolution is so poor. The caption says it's a Magnetic Field Detector.

[nelson]

Hi afl_72005, the article was published on december 1999.
I have it and i can share it, not here of course.
Regards
Nelson

Hi Esteban
Please say me what number and year published this article ?
Best regards.

[nelson]

I agree

Hi,
yes... but you provide data for coil... but not the other stuff...

Don't understand why you post coil data and then nothing else... so the thing you posted is just an oscillator !?

So... why ?

Ok, your choice... but that's not easy belive it can be used with success in real, working LRL... it's really low power... and not "state of the art" about stability.

I think people will belive in LRLs if a REAL and COMPLETE schematic will be posted... and anyone could replicate and check if works or not.

Don't need 30 meters or 5 meters range... also 50cm for a coin could be enough to show people if device works or not... but that needs you post something complete... not pieces.

Kind regards,
Max

[aft_72005]

It looks like January 1995, but I cannot be absolutely certain about the year, as the resolution is so poor. The caption says it's a Magnetic Field Detector.

Hi Qiaozhi

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