montana VLF

[rael]

Hi,

Original metal detector not have name. It is plastic box without labels. I has give this name depending on builder's city, Montana, Varna, Lovech, Berkovitza, etc.- cities in Bulgaria. VLF, PI, TR is the type of detector. "Montana_VLF" is induction balance metal detector, maked in Montana.

Best regards.

[plboy]

Hi Rael can you give more info for this 'montana'
what about the coils, dept

[rael]

Hi plboy,

Sorry, I did not see this metal detector from 7 years and don't remember more details.
In my opinion, the interest is too big for this design.
For instance, Andy Flind's project have detailed description for building (my first design in 1982 year).

Look:
http://geotech.thunting.com/cgi-bin/...gnum/index.dat

Regards.

[aft_72005]

Montana was not original work and name . I read it was a modified circuit from an old vlf "electronic magazine project" . I am not sure but I think the "original" operating frequency was around 13 khz . A u.s. quarter at 8 inches with discrimination , but it must have some problems , because I saw this circuit several years ago and never heard anything again untill now . So , must not be very popular and maybe not good in difficult soil......Eugene

Also , I will look for a folder with 3 or 4 pdf files from 2007 on this Montana !!! I sure hope I can find it . One pdf file was not in english and it was about 6 or 7 pages and was all about building this Montana VLF. I hope my memory is working ? !!

Hi amtech 2005
Waiting for your data ,please upload it.
Best regards.

[aft_72005]

Freq for this schematic is 18 khz i think.

Hi strujas
Are you built Montana ?
Best regards.

[Eugene52]

Montana VLF

I will search for the Montana folder today !! It was in a zip-file I found on a foreign language metal detector website . I have not forgot , but it is nice to be reminded....................Regards..............Eugene

[Eugene52]

Montana VLF

Here is the "Beautifull" PDF File !!!! ...............Regards...............Eugene

[strujas]

Hi strujas
Are you built Montana ?
Best regards.

No I didn't!.
I had a plan to build it but i gave up becouse of time (I have wedged with TGSL)
Here i found sch of montana
http://www.geocities.com/powerline_b..._bg/shemi.html
I had tryed to make some modifications but i didn't finished , i wil post that sch when i find it on some of cd's
Regards

[aft_72005]

No I didn't!.
I had a plan to build it but i gave up becouse of time (I have wedged with TGSL)
Here i found sch of montana
http://www.geocities.com/powerline_b..._bg/shemi.html
I had tryed to make some modifications but i didn't finished , i wil post that sch when i find it on some of cd's
Regards

Hi strujas
Thanks, seem you .I don’t have more time .also wafting for your schematic .
visited the link, circuit and pcb of coin seeker 2 uploaded at geotech .
Best regards.

[aft_72005]

Here is the "Beautifull" PDF File !!!! ...............Regards...............Eugene

Hi Eugene
Thank you, I saw it later . it was draw by Vladimir . any way ,thank you.
Best regards.