Goldscan 3 schematic

[Geoff]

Hi

Does anyone have a schematic for a Goldscan 3 pulse induction detector.
I have a none working Goldscan 3 and open circuit search coil, also any information on its the 11" search coil.

Kind regards
Geoff

[1843]

Hi,
Eric Foster has it. Ask him for that.

Regards

[Max]

Hi

Does anyone have a schematic for a Goldscan 3 pulse induction detector.
I have a none working Goldscan 3 and open circuit search coil, also any information on its the 11" search coil.

Kind regards
Geoff

Hi,
if I remember well GS3 was made in small number for particular needs. You need to ask Eric Foster about it.

I think it's not much different from e.g. GS4 but I don't know exactly differences between them... apart that runs at 24v voltage: custom version, so I think big differences could be in TX stage only.

Kind regards,
Max

[kt315]

I wildy doubt you simply will get the schematic directly. from the source. you must tune on hard, real hard, work on tracing of PCB. we say being in Pioneer Organization - 'Will Be Ready!' our answer on that is 'ALWAYS Ready!'
or 'Learn, Learn and to Learn'/ Lenin (c)

[Geoff]

Hi,
Eric Foster has it. Ask him for that.

Regards

Hi 1843
Thank you for your reply. I asked Eric Nov 2006 he has had a good look through old files,he can't find anything on the GS3. .

If anything turns up on the GS3, he will email me
Do you have any further information.
Kind regards
Geoff

[Geoff]

Hi,
if I remember well GS3 was made in small number for particular needs. You need to ask Eric Foster about it.

I think it's not much different from e.g. GS4 but I don't know exactly differences between them... apart that runs at 24v voltage: custom version, so I think big differences could be in TX stage only.

Kind regards,
Max

Hi Max
Thank you for your reply. I asked Eric Nov 2006 he has had a good look through old files,he can't find anything on the GS3. The circuit does appear to be similar to the GS4.
At the moment I will have to resort to drawing the schematic.

He says that f anything turns up on the GS3, he will email me
Do you have any further information.
Kind regards
Geoff

[Geoff]

I wildy doubt you simply will get the schematic directly. from the source. you must tune on hard, real hard, work on tracing of PCB. we say being in Pioneer Organization - 'Will Be Ready!' our answer on that is 'ALWAYS Ready!'
or 'Learn, Learn and to Learn'/ Lenin (c)

Kt315
Thank you for your reply. I asked Eric Nov 2006 he has had a good look through old files,he can't find anything on the GS3. .
He says if anything turns up on the GS3, he will email me
Do you have any further information.
Kind regards
Geoff

[kt315]

Geoff,
in an opinion, you can take GS-IV schematic and try to find differencies and similarities with what you see. if GS-III is two-samples schematic then take a look on Carl's article (Hammerhead). if it is four-samples one you simply learn GS-IV one.
https://www.geotech1.com/thuntings/s...light=Goldscan

[kt315]

how are you there Geoff?

Goldscans etc.
Eric Foster wrote:

Hi all,
Here is the post I made on the Finders.co.au forum. I guess some of the content will be of interest here.
The Goldscan actually started as a gold prospecting detector after a visit to Australia in 1982. So long ago "> It was evident from tests that I did that the ground mineralisation was very much stronger than anything I had encountered elsewhere, and that a straight PI had almost no hope of working. I then devised a multiple sampling and filtering system to get rid of the ground signal. First there was Goldscan 1 in 1983, which was a completely shaft mounted unit. Just a few of these were made and tried in the more mineralised areas of the UK, such as in parts of Scotland. From the production point of view it was easier to make a chest mounted control unit with built in rechargeable battery pack. This also had the advantage that the coil and shaft assembly could be made very light and comfortable. The Goldscan 2 was produced from 1984 and continued until 1992. By further miniaturising the electronics and having a belt mounted battery pack, it again became feasible to have a lightweight, shaft mounted control unit and the Goldscan 4 was born, which was latterly made by Pulse Technology. What about Goldscan 3?. This was a high power unit running from built in 24V lead acid gel batteries. It certainly had performance, but only a dedicated and rugged few braved its weight and the heavy digging tools required for retrieving targets.
All of these detectors had manual ground balance. An auto-ground balance version was designed on paper but never got to production. No real magic to auto-GB; just a feedback system to correct changes in ground mineralisation. Actually, with manual GB, little change in setting is required when going from one area to another, provided the ground signal stays within the linear range of the receiver. Hot rocks have very high concentrations of iron minerals and, particularly when using a mono coil, can cause temporary overloading. This distorts the decay curve and the signal then falls outside the pattern required for the GB filter to work. Hence a false response. This is where the Goldscans fell down in Australia, but having moved on to other detector developments, mainly industrial and underwater, I did not pursue it further. There are various ways of preventing receiver overload, but one good way is the use of a DD coil. SD users will be aware that a DD is quieter on highly mineralised ground than a mono. This is because a DD has a natural cancellation of near surface mineralisation signals, due to its balanced geometry. A mono coil, on the other hand will give a very strong response to mineralised ground due to the same coil being used for both functions. A hot rock passing under the coil edge will give a very strong signal due to the tight TX-rock-RX coupling.

[Geoff]

Hi Kt315
Thanks for some information and history of Goldscans.
Kind regards Geoff