Garrett Infinium Double D (10x5 DD) Coil Schematic + info + disection

L=0.56uH for brown coil.an L=249.4uH for the black coil with
No resistor in circuit.
The Brown coil is 26 Turns light duty tin plated multi-strand hook up style wire PVC coated
The resistance of this coil 0.9ohms
The black coil is 42 Turns light single strand Kynar wire.
The resistance of this coil is 7.4 ohms (with no resistor across)
Internally across this black coil wired in parallel is a 1/4w resistor 680
color code,blue,gray,brown,gold.

From front face of plug which is stepped in shape.
Top left exposed pin is Green
Top right exposed pin is red
Lower left pin socket is Black,with screen an Foil wrap to this.
Lower right pin socket is White.
The 5 core coil cable is foil wrapped in the sheath, cable has poly-core twine reinforcing for added strength an stretch resistance.
The Metal of the plug housing an knurled ring is not connected to any screen wire or other.

ABOUT ELECTRODAG

Electrodag 502 is a combination of specially processed carbon particles in a

fluoroelastomer resin system designed to provide high resistance values.  In its cured

form, it exhibits both high and low temperature flexibility and moisture resistance.

These benefits, when coupled with ease of application and long shelf life, make the

product adaptable to a wide variety of uses.  This product may also be mixed with

other Electrodag products to provide a wide resistance range.

ElectroDag PDF

There is also something called "silver dag" which is an aqueous suspension of equally finely divided silver particles where higher conductivity is necessary.

The lost Dutchman Mine

Weaver's Needle

There are some treasure stories that are so well documented and have been investigated, examined and written about so much that we cannot do them justice on these pages. The Lost Dutchman is one of those. We hope to give you the story here and want you to know that there is a lot of information available on the web, in libraries and bookstores.

Before we begin, it is important to note that there are really two separate stories about very pure gold veins in the Superstition Mountains. Some accounts represent these both as the Dutchman’s mine, some as two different stories. They are certainly intertwined. They may indeed be the same vein but we will treat them independently. The other tale can be found in the Arizona index as the Peralta Mine.

The “Dutchman” was actually a German named Jakob Walz. He was educated as a mining engineer in Heidelberg, worked in Prussia, Australia and California before moving onto Arizona in 1862. While working as a miner for a mining company, he fell in love with a beautiful Apache girl named Ken-tee. Many believe that he and other miners were smuggling gold out of the mine for themselves. The mine owners had the miner’s homes searched and found hundreds of thousands of dollars worth of gold, but none on the Dutchman. It is thought that Ken-tee helped Walz hide the gold he smuggled out. In any case, he was fired.

Walz and Ken-tee settled in a small community near the Superstition Mountains. One day they left and returned weeks later with burros laden with gold. They made the arrangements to have to gold shipped to mint in San Francisco. Where this gold actually came from has never been proven.

Superstition Mountains

We need to briefly look at the Peralta story. In 1845, he found a rich gold vein in the Superstition Mountains. While leaving the area in 1848 with his gold being borne out on burros, the Apaches attacked. This was sacred ground that they felt had been defiled. The Peralta party was wiped out.

This brought up the other possibilities for the Dutchman’s gold. Was it part of the gold that was scattered about still attached to Peralta’s burros? Was it from the Peralta mine? Was it a new find? Or was it simply gathered from a stash of gold he had smuggled from his previous employer?

Walz never talked, but the Apaches believed that the secret they kept about the Peralta mine had been betrayed by Ken-tee. They raided the Walz’s home and took Ken-tee. Walz and his neighbors pursued them and freed Ken-tee, but not before the Apache had cut out her tongue. She died in the Dutchman’s arms.

Walz became a hard-drinking loner. He became famous as the man who knew the location of untold riches and too bitter to claim them. 

Three years after Ken-tee’s death, another German arrived in Phoenix. Walz had probably sent for Jacob Weiser. The two seemed to be close. Weiser was a carpenter by trade. He was outgoing and became a popular figure in Phoenix.

One day the two of them disappeared. This must have been difficult to do, because everyone was curious about the location of the Dutchman’s gold and he was pretty regularly followed. They returned about a month later and sent off sacks full of gold to the mint in San Francisco.

Right away they set back out for the Superstition Mountains. They had gathered more gold and were camped on their return trip when the Apache attacked. Walz escaped with only the very little clothing he was sleeping in. Weiser got away also, but with an arrow through his upper arm and imbedded in his chest. He made it to a doctor but died by morning.

The Dutchman still went back on occasion to retrieve gold. He had eventually sent over $250,000 worth of gold to the San Francisco mint. Although he was never held for any murders, some of those that tried to follow him to his secret were never heard from again. It was considered unwise to get too close when he was going out.

At the time of his death in October of 1891, the Dutchman was a sad figure. He had lost everything in life he had valued except his gold. He even confessed to killing his own nephew. He had him brought over from Germany but then feared he would give away the location of the gold.

Julia Thomas, a kind black woman, had taken him in to her home and was caring for him. On his deathbed the left $15,000 and the treasure direction to her. She spent the rest of her life looking for the mine, but never found it. She died in poverty and passed her information onto Jim Bark, a rancher. Jim searched for 15 years, but found nothing. Some believe he left wrong instructions as a cruel joke. They say you can still hear him laughing in the thunder that echoes through the canyons.

He said the mine was in country “so rough that you could be right in the mine without seeing it.” It was shaped like a funnel with the broad end at the top. The mine contained an eighteen-inch vein of rose quartz that was about 1/3 gold.

“The mine is near the hideout cave. One mile from the cave, there is a rock with a natural face looking east. To the south is Weaver’s Needle. Follow the right of the canyons, but not far. The mine faces west… The mine can be found at the spot on which the shadow of the tip of Weaver’s Needle rests at exactly four in the afternoon.”

About Pulse Induction type metal detectors (draft)

I am an avid water, sand and dirt treasure hunter and I have 4 metal detectors with various coils for each one.

• Garrett At Pro VLF 15khz
• Garrett GTA350 VLF 7.5khz
• Fisher 1280-X VLF 2.5 khz
• Garrett Infinium Pulse Induction

I have found in my travels, different environments can render 3 of my detectors useless if not at least totally aggravating to try to use while looking for certain types of objects. So with these 4 units, I always have one that is best for the ground conditions and what I am looking for. Before I had them all, I was consistently frustrated when I did not have the right unit for the area.

Now when they start making a VLF where you can program your own frequency and it is waterproof, maybe I will sell all my VLFs and buy it. Then I want them to combine VLF with PI, I will then only need that 1 magic metal detector!.

As for programmable frequency VLFs, we really should have had one by now that costs under $1000, the technology has been here long enough. By programmable I mean letting me select almost any frequency I want or multiple frequencies at the same time and be able to save and tweak them.

Anyway getting back to Pulse Induction units. Every metal detector enthusiast should have an API Pulse Induction unit if they will be hunting near or in salt water or old homesteads. Since the APIs (Advanced Pulse Induction) will give a unique target signal for Silver and copper (a low-to-high pitch beep) and if you dig only those signals, it can be used to find deeply buried Silver, Copper and clad coins anywhere and it will go deeper than most all VLFs finding these items. Since you will not be digging high-low signals, you will not be digging much garbage.

There are other brands of PIs that have this feature and I think we are calling them all APIs at this point. While this feature is not particularly useful in the water at the beach, it is a game changer for PIs in the sand or dirt. You will just have to deal with lots of garbage when looking for gold. (sound familiar?) may as well get out your VLF for that!

From what I understand, basically the fundamental difference between VLF and Pulse Induction (PI) is:

• VLF units transmit a frequency energy pulse, then gives target information to the user based on the attributes of the received signal that bounces off the metal object.
• Pulse Induction units transmit a frequency energy pulse, then gives target information to the user based on the attributes of the received signal that the metal object itself transmits after receiving the energy pulse.

These 2 types of metal detector circuits each can do things the other cannot.

Pulse Induction Metal Detectors transmit a series of quick electronic pulses in to the ground. These electronic currents are not affected by wet salt sand and ground minerals (like VLFs that give false target signals, little relative depth and require constant ground balancing). A Pulse detector is best used for salt water beaches (near the water) and diving. The Pulse detector is very deep seeking, and is great for tough ground mineral conditions but has limited discrimination capabilities, so you will need to dig more trash items if you want to locate the maximum number of precious objects.

Here is a small list of some Pulse Induction underwater metal detectors:

• Garrett Infinium LS
• Garrett Sea Hunter Mark II
• Fisher Impulse
• DetectorPro Headhunter Pulse
• JW Fisher Pulse 8X
• Tesoro Sand Shark

About Pulse Induction Theory (cached from somewhere on the net)

All types of metal locators are "electromagnetic" in nature, and share a certain amount in common: the search head contains one or more coils carrying a time-varying electric current, and this generates a time-varying magnetic field which propagates towards the metal target (and in other directions as well of course). This primary field reacts with the electrical and/or magnetic properties of the target which responds to it by either modifying the primary field or, as a more general and more accurate description, generating a secondary magnetic field; one way or another, the effect links back into the coils in the search head (sometimes the same coil as the transmitting one, sometimes a different one), and induces an electrical voltage in the receiver coil(s). Beyond this basic similarity, there are a wide range of different variations used: in the number of coils (one, two or three); the "shape" (spatial extent) of the primary magnetic field; the frequency of the transmitter; the waveform transmitted (sinusoidal or pulsed); the dominant target property responded to (magnetic permeability or electrical conductivity); whether the head coils(s) have a magnetic core or are air-cored; and how the electronics separate the (very weak) received voltage out from the (potentially much larger) voltages present in the search coils even in the absence of any metal target. Although all these factors can affect the sensitivity to any one particular target, the last factor is probably the most important, as it determines the stability or "zero-drift" of the instrument:-- if the zero-point is unstable, high sensitivity will never be achieved, however much the other factors are optimized.

Pulse Induction.




If your browser supports animated GIFs, you should see below a "movie" of the Pulse Induction process locating a steel bar (This is in slow-motion: things actually happen 5000 times faster!)

A pulse of current is sent (repeatedly) through a coil in the search head. This current tends to start up fairly gently (and is allowed to do so); see figure 1a. However, at the end of the pulse, it is arranged that the current turns off very rapidly (within a few microseconds); this (briefly) induces a very large "voltage spike" or "back-e.m.f" across the coil (rather like the induction coil used to generate the spark for a car engine ignition, though in this case the voltage is only(!) about 100 volts); see figure 1b. After the mayhem of this transient is over, there is no current flow through the coil and no voltage across it. After about a millisecond (or less or more, depending on the particular model) the whole cycle is repeated. The primary (or transmitted) magnetic field will vary with time exactly in step with the figure 1a current waveform, and propagates (rapidly -- at the speed of light) down to and through the target. When the pulse is switched off, and if the target is a conductor, eddy currents are induced to flow in the target. These eddy currents always flow in such a direction as to try to re-create the magnetic field that has just disappeared, and, initially at least, they actually succeed in this; but once the primary field has all gone, there is no source of energy to maintain these currents, so they decay gently away -- nevertheless persisting for about a hundred microseconds; see figure 1c.



The eddy currents generate a secondary magnetic field which propagates in all directions, including back towards the search head, where it induces a (small) voltage in the coil; this voltage also decays away at the same rate (see figure 1d), and has the same sign (polarity) as the back-emf spike. The received voltage from a target at the limit of the detection range may only be a few micro volts: one ten-millionth of the back-emf spike! It would be quite out of the question for the electronics to notice such a tiny change actually during the back-emf spike, and that is not the way it's done. The signal is "sampled" by an electronic switch which ignores the signal during the transmit pulse and immediately after (during the back-emf), and only "looks at" the signal after a short delay which ensures that the switch-off transient is over (see figure 1e). In this way, the transmitted and received signals are separated from each other. If the target had been purely magnetic, but non-conductive, it would have become magnetized by the transmit pulse, and then de-magnetize just as promptly at switch-off; by the time of the delayed sample pulse, nothing would be happening down at the target, and therefore nothing would be happening up at the search coil. If the target is both conductive and magnetic (eg a ferrous metal), the eddy currents would be produced exactly as in the purely conductive case; the effect of the target's magnetic permeability is to enhance the magnitude of the effect (and also to modify the "time-constant" of the decay of the eddy currents). If there is no target at all . . . . . . . . nothing happens! Actually, there will always be a certain inescapable amount of electrical "noise" in the receiver coil and circuitry, and three techniques are used to filter this out to produce a final signal (in the absence of a target) which is very close to zero and absolutely rock-steady. The decay time-constant (persistence) of the eddy-currents, and hence received signal, depends (predominantly) on the target's electrical conductivity and size. Targets such as low-conductivity alloys or thin foils have a very short decay time; and the choice of a short or long delay between switch-off and sample can be arranged to either detect or ignore such targets. The ionic conductivity of sea- or brackish water is so low, and its decay time so short, that such signals have always decayed away before the sample is taken; so the P.I. technique is not affected by moisture.