need mfd

[WM6]

Originally Posted by oroboy

http://forums.qrz.com/showthread.php?231002-Through-Ground-Radio-(Below-500-KHz)&

Yes, this ground conductivity (apparent of ground resistivity) VLF method has some potential. Worth for further research. But not in connection with dowsing rods.

[ma330]

for kakale

[ma330]

hi to all
What is the best in class amplifier to boost the frequency to penetrate to the ground(for mfd)?
A?B?...?
please answer
TANK YOU

[WM6]

Trick is not in force, but in correct measurement.

You can use one 5-10W audio amplifier chip.

But if you still trying with L-rod combination, you probably need 5-10kV pp to sense something.

[Dell Winders]

Originally Posted by J_Player

This is the most often used kind of MFD which some people say they have success with: http://www.geotech1.com/cgi-bin/page...mfd1/index.dat
You can find instructions also for making the rods here: http://www.geotech1.com/cgi-bin/page...lrl1/index.dat
This is the same kind that Dell Winders sells as Omnitron, and many others make copies.



When you finish the circuit you can connect the signal out (+) and (-) to the two brass rods that you push into the ground.
Turn R5 to make adjustment of how much voltage you send to the brass rods.
Turn S2 to switch to different frequency.
S1 is to turn off power.


Best wishes,
J_P

J PLAYER, you are so full of BS, you couldn't tell the truth if your life depended on it.

Shame on you for posting false information to unsuspecting viewers. Dell

[goldfinder]

Originally Posted by Dell Winders

J PLAYER, you are so full of BS, you couldn't tell the truth if your life depended on it.

Shame on you for posting false information to unsuspecting viewers. Dell

I'VE SEEN Dell Winders machines and JP is right on the money. Only difference is price and the signal generators which on Dell's machine is a worked over off-the-shelf signal generator that will run off a battery and the JP device that generates the signal with a simple chip. Anyone with 2 brain cells operating can build the JP shown device including the rotator rods for $30 or less. They both do the same thing - NOTHING WORTHWHILE!
Goldfinder

[Carl-NC]

Originally Posted by Dell Winders

J PLAYER, you are so full of BS, you couldn't tell the truth if your life depended on it.

Shame on you for posting false information to unsuspecting viewers. Dell

I've seen several of Dell's machines, and while they don't have "the same" circuit as the 8038, they definitely have "the same kind" of circuit. So JP is right.

The shame is adding useless electronics to a pair of dowsing rods and passing it off as anything more than... useless.

[oroboy]

www.youtube.com/watch?v=hCzyMQQAfCM

[J_Player]

Originally Posted by ma330

hi wm6 and j-p and geo and other freinds
I worked with my mfd.Bars indicate one point, according to j-p.
http://www.longrangelocators.com/for...1&postcount=10
http://www.longrangelocators.com/for...4&postcount=13
I dug into the specified location and took out a stone at a depth of 120 cm.
my lrl detect Was evident in the stone.
How do I make the distinction between rock and metal veins?
How do I filter would only reveal rocks and minerals and metals?

Hi ma330,
I can think of one reason why you have problems with your MFD dowsing.
If you go to the page that shows the instructions for building and using the MFD, then you can look at the bottom of the page to see the answer:

http://www.geotech1.com/cgi-bin/page...mfd1/index.dat
"Once you have the target pinpointed you may have to face another problem: depth. The MFD can detect targets as deep as 100-200 feet, so locating the target is only half the battle. If a metal detector does not verify the existence of a metal target at the identified location then you should bring in excavation equipment. If no obvious target is found when you reach 200 feet, then the target was most likely subatomic gold particles - you cannot see it and most chemical analyses will not detect it either, but the MFD will".

You can see that you have correctly found the treasure.
But there are two problems which you must now solve:
1. The treasure is not the rock you dug, because a rock is not a metal treasure.
We can see you did not dig deep enough.
You will need to dig much deeper to find the real treasure which is buried beneath the rock.
Maybe you will need to dig 200 feet deep before you find the treasure.
So you must go to rent a tractor such as an excavator to dig a very deep hole.
If you are lucky, you might find the treasure in the first two or three days of digging.

2. If you don't find the treasure after a week of digging with a tractor, then maybe the treasure is subatomic gold particles.
If this is what you detected, then you will not find it because these particles of gold are too small to see.
But you can be happy to know that your MFD worked to find it.
This means you did a good job of building your MFD because you were successful in locating the subatomic gold particles.

I hope this solves the mystery of MFD and convinces you that MFD really works.
If you begin to think that MFD does not work, then you are beginning to think the same as most treasure hunters who prefer to leave the MFD at home and use a metal detector.

Best wishes,
J_P

[ma330]

i have a problem
When I put the measuring frequency.Frequency is 5 kHz.When the probe is connected to the ground I change the frequency.Frequency of 5 kHz is transmitted when the connection to the land or a frequency oscillator is also changed?
I set the frequency of re-connecting the probe to the ground?
Or changes due to land Resistance and a normal thing and it should be noted?The frequency is 5 kHz and transferred to the frequency that the frequency counter?

[WM6]

If you think that frequency have to be 5kHz, then it have to be 5kHz, not 4.86 or 5.25.

Mean you need stable frequency generator, without changing frequency after connection to earth.

Probably digitalised version of signal generation.

[ma330]

tank you wm6
Whether a probe containing positive frequencies can also play the same frequency in the ground?
Similar picture

[reza vir]

Originally Posted by ma330

I need information about a mfd project.And I need a schematic for mfd.Can anyone help me?

The circuit further searches metals
The only problem is, there is no frequency variable capacitors suffering?? Gold and Silver

[mahinda]

my friend.....

please give me answer this dowsing problem .what is connect circuit diagrams dowsing rod ?

[reza vir]

Originally Posted by mahinda

my friend.....

please give me answer this dowsing problem .what is connect circuit diagrams dowsing rod ?

Hello my friend in this type of device MFD.
The bars do not connect
Generators connected to the ground by the probe.

[pigeon]

Originally Posted by ma330

for kakale

hi all

please anyone have the pcb in format pdf

thank you for help

p.

[UltraLRL]

Originally Posted by ma330

hi to all
What is the best in class amplifier to boost the frequency to penetrate to the ground(for mfd)?
A?B?...?
please answer
TANK YOU

CLASS A, Because Class-A Output devices conduct through 360 degrees of input cycle.

[UltraLRL]

by Andy Collinson

read more at :
http://www.zen22142.zen.co.uk/Circui...ar/funcgen.htm

[goldfinder]

The 8038 like the 555 is basically a resistor capacitor oscillator and they drift in frequency with temperature. If you want frequency stability use a PIC uC with a timer loop which is very stable.
GoldFinder

[reza vir]

Originally Posted by goldfinder

The 8038 like the 555 is basically a resistor capacitor oscillator and they drift in frequency with temperature. If you want frequency stability use a PIC uC with a timer loop which is very stable.
GoldFinder

Hello my friend
Do you have a specific circuit?
Send to me Thanks & Regards

[UltraLRL]

http://www.electronics-lab.com/proje...ion-generator/

http://www.scienceprog.com/avr-dds-s...generator-v20/

Main AVR DDS V2.0 signal generator features:

Simple circuit with easily accessible and cheap components;
Single sided PCB;
In box power supply with external AC plug;
Dedicated high speed (HS) signal output up to 8MHz;
DDS signal with variable amplitude and offset;
DDS signals: sine, square, saw, rev saw, triangle, ECG and noise.
2×16 LCD menu;
Intuitive 5 button keypad.
Frequency adjusting steps: 1, 10, 100, 1000, 10000Hz;
Restoring last configuration after power up.

[UltraLRL]

source code
EagleCAD schematic and PCB
Proteus simulation files

[pigeon]

Originally Posted by J_Player

It turns out this TDA7294 amplifier is even more interesting than I thought.
Aside from being a very low distortion high power amplifier, it runs on a dual power supply that the signal generator IC can share with it.
This means you can use the two 12v batteries like Michael has in his Bulgarian LRL to run both the TDA7294 power amp and the signal generator.
The output from this amp will be higher because of it's 24 volt supply instead of the 12v that the signal generator is using above.
But this is not a problem, the 8038 signal generator is good for up to 30 volts each side of the supply.
So we can plug it into the same supply and send the signal to the TDA7294 all on the same board if we want.
This seems quite convenient for MFD builders.

This amplifier is intended to drive typical speakers from 4-8 ohms. Since the ground usually has much higher impedance, We cannot expect to put the full 100 watts of power into the ground.
But since it can handle up to 100 watts, it seems a good candidate for a step-up transformer to increase the voltage at the probes to get more power into the ground.
Of course, power transistors could do this too. The main difference is this IC is able to maintain a very clean signal without distorting it at power levels, and it is on a single IC.
When we start sending more power out, we can expect the amplifier to heat up, so we need a heat sink that will carry the heat away.
The image below shows a typical heat sink used on an audio amplifier.
But this could be made smaller, especially if you include a fan to circulate air through the fins, similar to how computer fans work.

Because this IC matches up so well to the 8038 signal generator, I show some concepts of how you could hook it up below.
This is not a circuit I tested, but I think it may work if I didn't get any mistakes in the connections.

In the circuit you can see I changed the two capacitors that set the frequency for the 8038 to a bank of 6 capacitors with a rotary switch to select which frequency you want.
You can fill in any capacitor values for your favorite frequencies.
There is also an option to make adjustments to the frequency at pin 4 on the 8038, or you can leave it in the original design.
You can also see where the transformer goes.
You can choose the transformer type depending on the soil conditions.
I think you will have a wide range of soil impedance depending on ground mineralization and how wet the soil is.
For this reason, I doubt any one transformer would be suitable for all soil.
But at least you have some control at the power knob.
Another option would be an adjustable auto-transformer that you can change to suit the soil.
But don't forget the batteries.
When you put out more power, you need bigger batteries.

Keep in mind that Michael's Bulgarian MFD locator uses this same amplifier, but he was able to detect nothing ever, even though he could measure the signal in the ground up to 2 meters distance.
And that is exactly what I think you will detect with this MFD detector... Nothing.
If you think I am wrong and this circuit really can locate treasure, prove me wrong.


Best wishes, J_P

hi friend

have you pcb for this

thank you