Action of the Earth in solenoids

[Esteban]

If you use spiral is more sensitive, but strong telluric currents can be detected with it.

Here an handmade spiral finish recently. Hardzarous to winding. Winding and paste, winding and paste...

[Esteban]

With round loop.

[Morgan]

Coil tesla

If you use spiral is more sensitive, but strong telluric currents can be detected with it.

Here an handmade spiral finish recently. Hardzarous to winding. Winding and paste, winding and paste...

This kind of spiral coils are very easy for winding Esteban,if you use special and easy tecnique,just start the spiral coil between two wood circles with the desired wire expessor(can control this with screw in the midle),and when finish winding take out the circle from the top,put glue on wire turns ,et voyla

[Esteban]

This kind of spiral coils are very easy for winding Esteban,if you use special and easy tecnique,just start the spiral coil between two wood circles with the desired wire expessor(can control this with screw in the midle),and when finish winding take out the circle from the top,put glue on wire turns ,et voyla

Maybe... maybe

[Geo]

With round loop.

Hi Esteban.
Some questions
1.At this magnetic field detector is it practical to reconect the reading leds and to work only with the speaker????
2. Do you think that it is a good choise (if i construct it) to find a big treasure??? or it is better the passive receiver
3. At who distance (max) it can (if it can) locate a big treasure of gold (50x50x50 cm )??

Regards

[Esteban]

Hi Esteban.
Some questions
1.At this magnetic field detector is it practical to reconect the reading leds and to work only with the speaker????
2. Do you think that it is a good choise (if i construct it) to find a big treasure??? or it is better the passive receiver
3. At who distance (max) it can (if it can) locate a big treasure of gold (50x50x50 cm )??

Regards

Hi Geo

1. In general, the first led is on (adjusted with the 10 K preset). But I think is better one external pot. for to leave on this led. The other potentiometer is for to manage the audio. This last is your sensibility control. You don't use here piezo sounder. Instead it you use a beeps generator for to catch the small variations.

2. Is only receiver. Is very good for treasures, don't fail is treasure is 30 meters of the loop. The 150 silver knives, spoons, etc., posted on another thread (but show only 3 of these –I'm waiting the photo of treasure taken in cellular phone–) was found with it!

3. Respond on point 2.

In general, tends to be most sensitive for silver.


Regards

Esteban

[Esteban]

You can see here toroidal coils I use on it. I saved from old PCBs, first these!

[Esteban]

When battery of this circuit is low, led and audio come crazy, so this "natural" advisor is an advantage. My big THANKS to Andy Flind!

[Geo]

Hi Esteban.
The problem is that at my City i can't find the LM3915.
If it is better from passive receiver i will give it a try.
At who distance did you found the silver knives, spoons, etc?????
Also at one photo from you i saw inside a FM radio again????
What about it??? Did you found the silver knives with the radio inside or no??
Regards

[Geo]

You can see here toroidal coils I use on it. I saved from old PCBs, first these!

I believe that the coils here have many turns for this circuit. We want a transformer with Z1 as the z0 of the Loop and Z2 the total resistance of the transformer 2x6v/100ma
Regards

[Geo]

When battery of this circuit is low, led and audio come crazy, so this "natural" advisor is an advantage. My big THANKS to Andy Flind!

So is it better to work with lower voltage and biger serial resistance????

[Esteban]

Hi Esteban.
The problem is that at my City i can't find the LM3915.
If it is better from passive receiver i will give it a try.
At who distance did you found the silver knives, spoons, etc?????
Also at one photo from you i saw inside a FM radio again????
What about it??? Did you found the silver knives with the radio inside or no??
Regards

Maybe you can replace by LM3914, but this is lineal in voltage, not logaritmic.

A friend found by similar machines based on this circuit. He found at 30 m, buried 1.30 meters. I put the radio inside, but is not necessary. Yes, the detection was with radio inside, but also without radio I found several times objects with it. I like it because this is some reluctance to detect riffle cartridges, for example, but round buttons silver, bronze, etc., coins and other things are detectable.

[Esteban]

I believe that the coils here have many turns for this circuit. We want a transformer with Z1 as the z0 of the Loop and Z2 the total resistance of the transformer 2x6v/100ma
Regards

No, is a coil wound in core, only 2 ohms. You can't use here transformer, this is not useful for the pistol and because with transformer interferences of electric lines is a poison!

[Esteban]

So is it better to work with lower voltage and biger serial resistance????

The voltage indicates for circuit is OK, but I use AA batteries, no the rectangular 9 V. I think, but I not try, to use resistor for each led for reduction of consumption.

[Geo]

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