GoldScan IV

[fmnotes]

THEY IS BETTER GOLDSCAN 4 FROM THE DELTAPULSE?

HELLO.
I WANT TO MANUFACTURE GOLDSCAN 4.
THEY IS GOOD LOCATOR?
IT HAS GOOD RECORDS?
I MANUFACTURED THE DELTAPULSE,
THEY IS BETTER GOLDSCAN 4 FROM THE DELTAPULSE?
I REQUEST WHOEVER KNOWS, IT HELPS ME.
I THANK.

[batman1972]

GoldScan 4

Dear Max
Thanks for ur guide around Goldscan.I saw u made it!
what's Depth spicifications of Goldscan?
Have u PCB and full part list?
thank u and goodluck

[jamal]

hi max
i am to bide one's time....
and i am await your...
for GS4 I am question , for internal circuit in red circuit in illustrated attached .
you have diagram, written on any program for circuits design .
and question about control panel what is the consist of (switchs & variable resistant)
jamal....
submit message

[jamal]

hi max
I want search off box (60 *40*40) under depth 2.5 M .
which the design . can your advise my to made it . in this forum
2) about VLF 443 I connected all cables but I do not confirm from it correct.
3) for GS4 I am question , for internal circuit in red circuit in illustrated attached .
you have diagram, written on any program for schematic design.

jamal....

[Max]

hi max
must claim your god to point
out to solution the troubles

jamal

Hi Jamal,
the readings of ma meter about detection are not important... most important is sound in GSIV, you have to hear sound and any , even small, increase in pitch means you detected something...

Of course, the more the pitch increase (higher frequency) the more the target is either near or big ... so produce eddy current signal detected by device.

As said, the GSIV have problems with hot rocks and not perfect flat-soil-composition... so if there are e.g. fired ceramics is a big trouble.

The detection range vary depending of your setup... usually GSIV is better equipped with 8'' round coil... but several variations could be made e.g. for depth PI adaptation of it... that way is also invaluable tool too.

I don't understand your reference to VLF443 and schematic... where's the problem ?

Kind regards,
Max

[jamal]

gs4

hi max
must claim your god to point
out to solution the troubles

jamal

[Max]

HI MAX
where are you....................
can you used a circuit to assigning
volume or depth from through the outcomes for (MA).as E.G

?

[jamal]

gs4

HI MAX
where are you....................
can you used a circuit to assigning
volume or depth from through the outcomes for (MA).as E.G

[jamal]

this is diagram


jamal...........

[Qiaozhi]

hi max
firstly thank you ...........
I want go fro,,, you are speak for VLF .
I have same this detector (VLF443),
but exist some problems in it and no do .
important this problems - disconnected in wiring between bc board and switch panel .
I connected all cables but not doing , I need your help if you have information about it
note - I draw (BC ) board in my self
-- attached file type (auto cad)I attempt upload but he is gave invalid file.
gave my your email to send this file if you want

Kind regards
jamal

Compress it to a zip file. Then you will be able to upload it.
Also, try to output the file from AutoCAD to a more general format, such as PDF or JPG. Then everyone can read it.

[jamal]

hi max
firstly thank you ...........
I want go fro,,, you are speak for VLF .
I have same this detector (VLF443),
but exist some problems in it and no do .
important this problems - disconnected in wiring between bc board and switch panel .
I connected all cables but not doing , I need your help if you have information about it
note - I draw (BC ) board in my self
-- attached file type (auto cad)I attempt upload but he is gave invalid file.
gave my your email to send this file if you want

Kind regards
jamal

[Max]

hi max

I show is. if (sw1-c)normal switch , that means the (1,2,3) same the point.
and what is your the meaning
trimpots
disc/matrix
thank for you

Hi,
no... it's not a normal switch but somethign like in the picture... I said 3-ways... so it's made with 3-separate section that's why s1-a, s1-b, s1-c ... each letter is a section of it.
So, also if at s1-c is wired the same at different positions the difference there is at other sections , look at schematic carefully.

Trimpots are small variable resistors placed on pcb , used for tuning of MD.
disc stays for discrimination; matrix I mean composition of soil... with oxides and everything... can be e.g. clay matrix with oxides etc or e.g. sand-like-matrix like in deserts.

PS: in pdf you find a little tutorial that explains the use of these switches... if you never did before.

Kind regards,
Max

[jamal]

gs4

hi max

I show is. if (sw1-c)normal switch , that means the (1,2,3) same the point.
and what is your the meaning
trimpots
disc/matrix
thank for you

[Max]

hi max
I want make GS4 but I need you help.
but I have questions before made it.
1- what is the (HP) . and how operate function in the circuit
2- what is advantage from (1MA)
3- CH1 , CH2 - how are operate.
4- what is function this switch (sw1c, sw1a, sw1b)
thanks my friend .
Kind regards....
jamal

Hi Jamal,
ok... will try to help:
1. the HP is headphone... if wanna use them just wire up a socket and use something headphone set , better if quality one, of at least 32ohm impedance... you know like old philips big ones with ear cover, like dj stuff I mean... that have 32 or more ohm impedance... that's fine using well higher also (some 150ohm could work also good, but need volume pot on the headphones)
You can also leave it out... use just speaker stuff.

2. 1mA is the instrument for visual indication of detection... don't really nead it... doesn't add much cause your finest sens output is always at sound change... you regulate MD to provide a slow pitch...pulsating frequency... then when metal is near the pitch rise quickly... the meter also move but for far/deep stuff you get audible indication much more useful... so can also omit meter.

3. there are two channels... labeled sometimes "gold" and "iron"... well actually one (gold) is the signal path for targets... the "iron" one is employed when you operate in "disc" mode... but also plays a role in ground balancing of MD. If you don't use iron channel...removing from schematic... the MD is like simple PIs without ground balance or "disc".
Now... when talking about disc... disc is not as it is in VLFs ... not comparable... it gives you some iron ignoring but few and it's not reliable in reality of random searchfield... you may also miss stuff using it cause reduce sens of MD.
The GSIV was made with in mind Australia gold-fields... Victoria state I think.... where there's lot of magnetic stuff in the soil matrix... including powders of iron oxides... magnetite... and hot rocks... fired-magnetic-material from volcanic activity etc... along with the gold nuggets. So it's not really a disc machine for general purpose...

4. the selector 3-ways and 4-positions is for mode of operation... no/all-metal/sel1/sel2 : it's about disc mode of operation... sel1 and sel2 are preset modes used for particular disc setting... all-metal is for all-metal search including small stuff like gold rings at beach... no offers just ground-balancing... all is due to the change in timings and the presets made with some trimpots in critical points of circuit.
I say that in sel2 (differently from other modes) you get a very long delay about 250uS in one of the paths that enable a particular kind of disc/matrix rejection... in practice can ignore also big amounts of flat mineralization but still find targets like copper items or brass... useful for Australia soil... or very mineralized soil in general.

Kind regards,
Max

[jamal]

gs4

hi max
I want make GS4 but I need you help.
but I have questions before made it.
1- what is the (HP) . and how operate function in the circuit
2- what is advantage from (1MA)
3- CH1 , CH2 - how are operate.
4- what is function this switch (sw1c, sw1a, sw1b)
thanks my friend .
Kind regards....
jamal