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Directory Topics Posts Last Post
General
Can't Register? Can't Log In? START HERE
Please read BEFORE contacting admins
Topics: 3 Posts: 3
Last Post: Other Issues
3 3
Carl-NC
by Carl-NC
Announcements
Read this first before posting
Topics: 2 Posts: 2
2 2
Inside the Metal Detector
ITMD1&2
Discussions concerning content, circuitry, source code, etc for the 1st & 2nd editions.
Topics: 61 Posts: 697
61 697
dbanner
by dbanner
ITMD3
Discussions concerning content, circuitry, source code, etc for the 3rd edition.
Topics: 23 Posts: 622
Last Post: ITMD4
23 622
ivconic
by ivconic
Sub-Forums:
IB Designs (4/5)
PI designs (5/66)
Technology
Tech Forum
General tech discussions on all types of metal detectors: VLF, 2-box, BFO, off-resonance, PLL, etc. Questions, ideas, and anything else that moves you.
Topics: 5,599 Posts: 86,494
Last Post: IDX-PRO+VDI
5,599 86,494
Orbit
by Orbit
PI Technology
Tech discussions specific to Pulse Induction
Topics: 458 Posts: 25,245
Last Post: Sniffer XR-71 help
458 25,245
kt315
by kt315
Coils
Same as the Tech forum, but coil-specific.
Topics: 2,353 Posts: 24,945
2,353 24,945
GeoMax
by GeoMax
Modifications
Detector mods, plus any other useful add-ons.
Topics: 761 Posts: 7,839
761 7,839
Schematics
If you have a schematic to share, post it here. Please read the Intro post for rules on posting schematics.
Topics: 1,637 Posts: 31,278
Last Post: OLD BFO
1,637 31,278
aft_72005
General Detectors
A place to discuss the non-technical aspects of metal detectors. Your favorite detectors, favorite features, or favorite accessories.
Topics: 79 Posts: 1,405
79 1,405
the79element
Magnetometers
Tech discussions on mags.
Topics: 751 Posts: 4,264
Last Post: trimpot adjustment
751 4,264
GeoMax
by GeoMax
Technical Books, Papers, and Literature
Technical books, papers, and literature related to treasure hunting technology. Any books written by Geotech members are made sticky at the top of the forum.
Topics: 15 Posts: 180
15 180
Side Scan Sonar
Tech discussions on sonar, transducers, and towfish construction.
Topics: 873 Posts: 3,293
Last Post: JW Fishers Pulse 12
873 3,293
Yury
by Yury
Geophysics
Other geophysics techniques, including earth resistivity, GPR, infrared, induced polarization, etc.
Topics: 379 Posts: 3,421
379 3,421
Tools & Techniques
Vacuum forming, coil winding, packaging... anything mechanical.
Topics: 207 Posts: 2,230
207 2,230
General Electronics
Cool circuits, tips, techniques, PCB methods, test equipment, etc.
Topics: 603 Posts: 5,957
603 5,957
Repwoc
by Repwoc
Programming
This is a special section dedicated to coding techniques, tips, tricks, methodology, programming various modules, MCUs, digital filters, etc. Basically, anything code-related.
Topics: 60 Posts: 523
60 523
Projects
Project Competition
Got a something in mind you would like to see designed? Post it here and see who can come up with the best solution.
Topics: 12 Posts: 832
12 832
Completed Projects
Projects that have been reasonably completed
Sub-Forums:
Arduino Nano PI (9/959)
Baracuda PI (81/3,783)
Beachmaster PI (3/287)
Geotech Baracuda (53/872)
Hammerhead PI (413/3,775)
Hammerhead II PI (24/718)
Minipulse Plus (192/4,262)
SPI-MX 3b (17/165)
Stuart I & II PI (38/277)
Voodoo (6/1,792)
Active Projects
Projects that are currently being developed
Sub-Forums:
AMX Project (11/917)
Spectral G4 (1/51)
Abandoned Projects
Project that were never completed but may still have good info
Sub-Forums:
GPR Project (38/506)
Kingfisher PI (2/56)
Surfmaster II (19/568)
Tinkerer's IB-PI (32/1,822)
USB Projects (10/1,887)
Misc
Buy-Sell-Trade
Detectors, parts, electronics, and so forth. No dealer restrictions.
Topics: 1,092 Posts: 5,718
Last Post: carbon fiber holder
1,092 5,718
SimonS
by SimonS
Treasure Magazines & Books
Buy-Sell-Trade-Discussion specifically for treasure mags, books, & other publications.
Topics: 213 Posts: 456
213 456
Vintage & Collectable
Pics & info on vintage detectors, for those who like "the good ol' days" of digging everything.
Topics: 192 Posts: 1,047
192 1,047
Melbeta's Vintage Files
Unique vintage metal detector info donated by denizen 'Melbeta'.
Topics: 91 Posts: 606
91 606
Free Advertising
Those who have products & services they would like to advertise may do so here. Please read the Intro post.
Topics: 122 Posts: 135
122 135
Forum Issues & Feedback
Problems with the forums? Suggestions for improvements? Post them here.
Topics: 4 Posts: 32
4 32
Kemper
by Kemper
Offsite Forums
Advanced Metal Detecting Research Lab
Italian website run by Leonardo Ciocca. Since 2009, a technical reference point. Objective and impartial to all lovers of the metal detector.
Topics: 0 Posts: 0
0 0
Topics: 0 Posts: 0
0 0
Eric Foster's PI Tech Forum
at Findmall.com
Topics: 0 Posts: 0
0 0
Pulsdetektor Forums
Tech forums dealing with the various Pulsdetektor projects. German only, Click Here for a BabelFish English translation.
Topics: 0 Posts: 0
0 0
Russian Metal Detecting forums
Lots of technical forums, but all in Russian. Click Here for a BabelFish English translation.
Topics: 0 Posts: 0
0 0
THunting.com
THunting.com is the former host for Geotech. These are general Treasure Hunting forums.
Topics: 1 Posts: 7
Last Post: End of an era
1 7
Tanu
by Tanu
LongRangeLocators.com
The world's largest forum dedicated to the discussion of LRLs and related devices.
Topics: 1 Posts: 2
Last Post: What can they do?
1 2
GeoMax
by GeoMax

What's Going On?

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There are currently 6728 users online. 97 members and 6631 guests.

Most users ever online was 87,796 at 08:10 AM on 03-19-2026.

Geotech Forums Statistics

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Topics: 17,952   Posts: 252,440   Members: 6,651   Active Members: 420
Welcome to our newest member, Mmm.

Latest Topics

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  • aft_72005
    OLD BFO
    by aft_72005
    Hello
    This is a BFO circuit from an old German magazine.
    Does anyone have the schematic? Or does anyone know the name of the magazine and the year it was published? It seems to be Elector magazine.​



    ...
    Yesterday, 09:04 AM
  • Bernardetector
    DETECTOR Simplex+
    by Bernardetector
    Hola a todos!

    Resulta que actualicé el detector a la versión 2.78 Pero ahora no se oye la bocina
    Estoy intentando encontrar esta versión "enc-simplex-system-2v76.bin"
    Para intentar corregir este tema.
    De antemano muchas gracias...
    07-27-2026, 05:26 AM
  • Aedell
    Pulse Star II ProI hope everyone helps
    by Aedell
    Hello please accept my passage I bought a Pulse Star 2pro device that does not work and I want a plan to track the malfunction as long as you are all well and I am sorry always my articles ask for help but I am a beginner and I learn from you and thank you Which is more than that, the one that is built...
    07-26-2026, 05:13 PM

trending

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  • eduardo1979
    IDX-PRO+VDI
    by eduardo1979
    Hello. I found this Russian forum of IDX-PRO PCB. The PCB had many mistakes and failures of some components. I corrected the PCB and added the missing components. I wish that we all take a look and give a chance on this project. Surely here in the forum there are people who would be interested in this...
    08-21-2011, 11:40 AM
  • aft_72005
    OLD BFO
    by aft_72005
    Hello
    This is a BFO circuit from an old German magazine.
    Does anyone have the schematic? Or does anyone know the name of the magazine and the year it was published? It seems to be Elector magazine.​



    ...
    Yesterday, 09:04 AM
  • Jafar
    Sniffer XR-71 help
    by Jafar
    Hi Carl, I need your help.

    I've built the Sniffer XR-71 device, but I'm struggling with some issues and could really use your support.

    One problem is that no signal appears on the oscilloscope under normal conditions—unless I touch pin 7 of the NE555 directly with my hand....
    10-05-2025, 05:09 PM
  • Nova
    External Shield?
    by Nova
    G'day all, i am a very curious person by nature and get a lot of ideas that pop into my head and about 2 months ago the idea popped into my head about " would it be possible to add an external shield to my mono coils for my gpx5000" as in some areas the emi is shocking and for me to run the...
    07-25-2026, 10:50 PM
  • Octopulse
    Deepstar 1
    by Octopulse
    Hello gurus
    I have in my possession a very lightly used original Deepstar. The problem I have is the detector will power on okay with a strong audio but after several seconds the detector threshold dies away to nothing and nothing can be heard….I have to power cycle to get the detector working...
    07-21-2026, 10:53 AM
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