The ‘Wombat Pulsed Oscillation’ uses a mono coil and capacitor (tank circuit) oscillating freely, similar to a good old BFO or a ‘VLF’ detector.
Unlike a BFO or VLF detector, it uses a ‘time of flight’ chip, the TDC7200, to measure frequency and amplitude change with...
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ITMD1&2
Discussions concerning content, circuitry, source code, etc for the 1st & 2nd editions.
Topics: 61
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Last Post:
Probe PCB from Silverdog
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ITMD3
Discussions concerning content, circuitry, source code, etc for the 3rd edition.
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Last Post:
Bipolar PI design
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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.
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PI Technology
Tech discussions specific to Pulse Induction
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Delta Pulse - Take 2
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Garrett Infinum/ATX mono coil
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Detector mods, plus any other useful add-ons.
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Topics: 1,640
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PIM-2 Digital Metal Detector Project
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A place to discuss the non-technical aspects of metal detectors. Your favorite detectors, favorite features, or favorite accessories.
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Magnetometers
Tech discussions on mags.
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751 | 4,266 |
by AnyScan209
10-31-2026, 02:10 PM
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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.
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Side Scan Sonar
Tech discussions on sonar, transducers, and towfish construction.
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Last Post:
AI can't invent. AI isn't creative.
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ENOB
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No clue about the title here!
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08-11-2026, 03:51 PM
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Buy-Sell-Trade
Detectors, parts, electronics, and so forth. No dealer restrictions.
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Treasure Magazines & Books
Buy-Sell-Trade-Discussion specifically for treasure mags, books, & other publications.
Topics: 213
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Vintage & Collectable
Pics & info on vintage detectors, for those who like "the good ol' days" of digging everything.
Topics: 192
Posts: 1,048
Last Post:
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Melbeta's Vintage Files
Unique vintage metal detector info donated by denizen 'Melbeta'.
Topics: 91
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Discrimination just does not work!!
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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.
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Eric Foster's PI Tech Forum
at Findmall.com
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Russian Metal Detecting forums
Lots of technical forums, but all in Russian.
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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
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LongRangeLocators.com
The world's largest forum dedicated to the discussion of LRLs and related devices.
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Last Post:
What can they do?
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There are currently 31242 users online. 96 members and 31146 guests.
Most users ever online was 255,203 at 06:34 PM on 10-02-2026.
-
Yesterday, 07:15 AM
-
Hi everyone,
I'm repairing an XP ADX 150 mainboard. The 10-pin IC located right next to the crystal , burned out after the coil cable was damaged.
The original IC markings are factory erased by XP.
Here are the PCB pin measurements without the IC installed:...11-05-2026, 04:40 PM -
11-01-2026, 11:30 AM
-
The ‘Wombat Pulsed Oscillation’ uses a mono coil and capacitor (tank circuit) oscillating freely, similar to a good old BFO or a ‘VLF’ detector.
Unlike a BFO or VLF detector, it uses a ‘time of flight’ chip, the TDC7200, to measure frequency and amplitude change with...Yesterday, 07:15 AM -
Hi everyone,
I'm repairing an XP ADX 150 mainboard. The 10-pin IC located right next to the crystal , burned out after the coil cable was damaged.
The original IC markings are factory erased by XP.
Here are the PCB pin measurements without the IC installed:...11-05-2026, 04:40 PM -
Aziz and myself have collaborated to bring you SPULE32 which is Aziz's coil modelling software.
He has kindly provided the original source code ( C, C++, ASM ) which originally was built for windows and I ( with AI help ) have ported to Javascript.
So to be clear Aziz did all the work and...10-29-2026, 11:29 PM -
Hi all,
we are really far from AGI (Artificial General Intelligence).
https://en.wikipedia.org/wiki/Artifi...l_intelligence
I have invented a most powerful drawing transfer method (for fine arts) a couple of years ago and it isn't published yet.
So all the...04-20-2026, 12:14 PM -
The mono loops have a TX and RX winding which are fully coupled and not inductively balanced. The Tx/Rx are wound together. The Tx is 18awg tin plate stranded with pvc insulation(258uH 0.6R). The Rx is about 30awg single strand teflon or kynar insulation(228uH 6.0R). Inside the coil is a protection...04-14-2026, 03:27 PM