Best DIY detector for gold on beach (wet sand and few seawater) in volcano soil

[gandolfi]

someone writes that you must sure make author coil detail-in-detail because he did/tuned the soft under one coil he has.
anotherway you get a trouble.

PS. how about sunlight people?

from user manual of 2.4 version

A Loop search criterion in the initial testing was of a spider with a capacity of
about 350uh and about 1 ohm resistance.
However, due to the possibility of adjusting the pulse width and delay and
integration in this circuit, there's actually possible to use a wide range of loops.
However, it's recommended to make a stronger pitch of the loop spider or flat like
this, to answering the separation and iron reject.
For proper functioning of the separation and iron reject, automatic Delay of loop
must be about 20 and if the delay be much higher than 20 the separation not
working properly.
Shielding the loop with graphite spray can be useful but not the right answer
with aluminum foil and metal detectors range will be low certainly, unless a very
thin coating of aluminum was used as a metal itself almost by metal detectors
cannot sense!
Cable of loop is also very important .Recommended loop cable to connect the
circuit of the brain that is high quality stereo Shield and the Shield on. The anti -
noise microphone cable tests MAX brand to have a good result.
connect the cables to the circuit in this case is that the brain stereo shield the
cables were connected at the beginning and end of the point -to-point cable shield
2LOOP attach some 1LOOP Contact field.
In fact, this method cannot use the Shield. It also tests a good answer, and given
that it may be appropriate stereo cable shield away, was the method used.
The exterior loop into the cable shields up.
Delay is the essential to note that much of the lower number, as well as cable
loops will find a sign of higher quality! However, should this test was whether to
close its metal cable or cables shaking, the reaction was shown or not? If the
cable does not fit! As well as cables with aluminum foil are often not appropriate.
If you use a 3-pin connectors and plug type military's recommendations. Of
course, of course, should not be near metal connector plug and use loop or loops
Metal Detecting will have a negative impact on performance. It may that plastic
connectors has a better answer.

[Koala]

thanks. Baraccuda have audio discrimination for ferrous or recognize target with sound ?

Yes and No

Depending on how you set the delay you get a broken sound through headphones and double beep on long thin iron

Best setting of delay for gold and you will loose this discrimination


As far as i know there isn't a PI with reliable discrimination on a real beach although they work in air tests

I have not seen a project with both a short delay and ground balance feature to work on black sand beaches and pick up a women's gold chain.

[gandolfi]

Can the barracuda reach a time of how much at the lowest?
From what time does it begin to eliminate or at least recognize the targets with the sound?

https://www.youtube.com/watch?v=sezwFw7lr80
https://www.youtube.com/watch?v=ue1km94NolI

[kt315]

rom user manual of 2.4 version

A Loop search criterion in the initial testing was of a spider with a capacity of
about 350uh and about 1 ohm resistance.
----
search criterion is not L and not R. main critarium is TC, Qiaozhi told about in details and gave the formulae. yet i can not give you direct link just now
because the forum is a cesspool of beginners requests. very hard to find out needed answer. also this forum has not possibility to merge similar threads in one.

[qute1]

"forum is a cesspool of beginners requests" indeed but we beginners need to start somewhere oh great Guru!

[gandolfi]

rom user manual of 2.4 version

A Loop search criterion in the initial testing was of a spider with a capacity of
about 350uh and about 1 ohm resistance.
----
search criterion is not L and not R. main critarium is TC, Qiaozhi told about in details and gave the formulae. yet i can not give you direct link just now
because the forum is a cesspool of beginners requests. very hard to find out needed answer. also this forum has not possibility to merge similar threads in one.

It would be necessary to be able to modify the first message of the subject to put according to answers. regarding your answer I am too beginner to understand it

[Andi68]

Some stay forever beginners

[qute1]

Every project is different and requires the acquisition of a new "tool-set" in almost every case, that which i learned in radio and radiation electronics is useful but not always applicable!

[dbanner]

rom user manual of 2.4 version

A Loop search criterion in the initial testing was of a spider with a capacity of
about 350uh and about 1 ohm resistance.
----
search criterion is not L and not R. main critarium is TC, Qiaozhi told about in details and gave the formulae. yet i can not give you direct link just now
because the forum is a cesspool of beginners requests. very hard to find out needed answer. also this forum has not possibility to merge similar threads in one.

Forum is also cesspool of expertise, good for beginners to revel in expert " mumbo jumbo"
Tc of coil( coil circuit) and Tc of target.
http://www.geotech1.com/forums/showt...+time+constant
Post#3

[kt315]

there was a post of Qiaozhi, i sure remember he gave the formula of TC of coil. can not find it out in this unstructured noise infogarbage.

[dbanner]

Also according to contemporary theory, the Universe began as a cesspool.

[dbanner]

The current rise TC of a coil is based on the traditional textbook current growth curve based on the TC of the TX coil circuit. This includes the coil inductance divided by the resistance of: the coil wire itself, any series resistance, MOSFET on-resistance, and the resistance of the coil coax lead.

The longer the TX PW the higher the TX current can rise. A 300 uH coil that is 5.4 ohms, with a .5 ohm MOSFET on-resistance and a lead resistance of .1 ohms has a total resistance of 6 ohms. 300/6 = 50uS.
This is why author of felezjoo pi was at lengths to explain details of coil and cable, cable connector etc, all related to TC of coil decay, for proper interpretation by software of ferrous/ non ferrous target.

[dbanner]

This is why I do not recommend felezjoo pi as first project. If things are not as author prototype, it will work but maybe not as was Intended.

[dbanner]

For felezjoo pi to work properly, all parameters must fall within " narrow" band, including characteristics of LF357N chip, which can vary chip to chip.

[gandolfi]

For felezjoo pi to work properly, all parameters must fall within " narrow" band, including characteristics of LF357N chip, which can vary chip to chip.

The concern of felezjoo is to manage to reproduce the conditions of the author.
So we can not adjust the software to match the coil?
So the coil must match the parameters of the software?
Is there a way to check if we have the right values with the series of three numbers displayed on the screen?