Would this circuit topology work for such a task. In this circuit, Vout is proportional to V1*V2. The F.E.T's conductance are matched to within+\-5%
Can the circuit can be tweaked for X and R channel inputs to give target information.
What do you think? This circuit is featured...
No content found
Please log in to your account to view your subscribed posts.
| 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 |
|
|||||||||||||||
|
Announcements
Read this first before posting
Topics: 2
Posts: 2
Last Post:
Commercial vs Non-commercial posts
|
2 | 2 |
|
|||||||||||||||
| Inside the Metal Detector | ||||||||||||||||||
|
ITMD1&2
Discussions concerning content, circuitry, source code, etc for the 1st & 2nd editions.
Topics: 59
Posts: 668
Last Post:
Adding tones to Raptor
|
59 | 668 |
|
|||||||||||||||
|
ITMD3
Discussions concerning content, circuitry, source code, etc for the 3rd edition.
Topics: 19
Posts: 510
Last Post:
Bipolar PI design
|
19 | 510 |
|
|||||||||||||||
|
Sub-Forums:
| ||||||||||||||||||
| 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: 5,514
Posts: 84,235
|
5,514 | 84,235 |
|
|||||||||||||||
|
PI Technology
Tech discussions specific to Pulse Induction
Topics: 390
Posts: 23,145
Last Post:
Hobby Hybrid MD1
|
390 | 23,145 |
|
|||||||||||||||
|
Coils
Same as the Tech forum, but coil-specific.
Topics: 2,307
Posts: 24,570
Last Post:
Why ferrite zero and not a ground zero?
|
2,307 | 24,570 |
|
|||||||||||||||
|
Modifications
Detector mods, plus any other useful add-ons.
Topics: 755
Posts: 7,768
Last Post:
Tesoro - Make it deeper
|
755 | 7,768 |
|
|||||||||||||||
|
Schematics
If you have a schematic to share, post it here. Please read the Intro post for rules on posting schematics.
Topics: 1,592
Posts: 30,344
Last Post:
Full m/lab SD2000 schematics
|
1,592 | 30,344 |
|
|||||||||||||||
|
General Detectors
A place to discuss the non-technical aspects of metal detectors. Your favorite detectors, favorite features, or favorite accessories.
Topics: 61
Posts: 1,266
Last Post:
Deus I v.s Deus Ii
|
61 | 1,266 |
|
|||||||||||||||
|
Magnetometers
Tech discussions on mags.
Topics: 739
Posts: 4,142
|
739 | 4,142 |
by NigelLeeming
04-30-2025, 06:46 AM
|
|||||||||||||||
|
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: 12
Posts: 169
Last Post:
Inside the Metal Detector, 3rd Edition
|
12 | 169 |
|
|||||||||||||||
|
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 |
|
|||||||||||||||
|
Geophysics
Other geophysics techniques, including earth resistivity, GPR, infrared, induced polarization, etc.
Topics: 374
Posts: 3,350
|
374 | 3,350 |
|
|||||||||||||||
|
Tools & Techniques
Vacuum forming, coil winding, packaging... anything mechanical.
Topics: 203
Posts: 2,114
Last Post:
AI
|
203 | 2,114 | ||||||||||||||||
|
General Electronics
Cool circuits, tips, techniques, PCB methods, test equipment, etc.
Topics: 592
Posts: 5,877
Last Post:
Hand held pin pointer question
|
592 | 5,877 |
|
|||||||||||||||
|
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: 49
Posts: 447
Last Post:
Bluetooth programming
|
49 | 447 |
|
|||||||||||||||
| 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: 10
Posts: 607
|
10 | 607 |
|
|||||||||||||||
|
Completed Projects
Projects that have been reasonably completed
|
|
|||||||||||||||||
|
Sub-Forums:
| ||||||||||||||||||
|
Active Projects
Projects that are currently being developed
|
|
|||||||||||||||||
|
Sub-Forums:
| ||||||||||||||||||
|
Abandoned Projects
Project that were never completed but may still have good info
|
|
|||||||||||||||||
|
Sub-Forums:
| ||||||||||||||||||
| Misc | ||||||||||||||||||
|
Buy-Sell-Trade
Detectors, parts, electronics, and so forth. No dealer restrictions.
Topics: 1,062
Posts: 5,621
Last Post:
Looking for a Garrett Sea Hunter xl500
|
1,062 | 5,621 |
|
|||||||||||||||
|
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: 186
Posts: 1,018
Last Post:
Compass Judge 1 Automatic
|
186 | 1,018 |
|
|||||||||||||||
|
Melbeta's Vintage Files
Unique vintage metal detector info donated by denizen 'Melbeta'.
Topics: 85
Posts: 579
|
85 | 579 |
|
|||||||||||||||
|
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 |
by Rama2389
02-10-2025, 12:48 PM
|
|||||||||||||||
|
Forum Issues & Feedback
Problems with the forums? Suggestions for improvements? Post them here.
Topics: 1
Posts: 3
Last Post:
Forum changes
|
1 | 3 |
|
|||||||||||||||
| 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 |
|
|||||||||||||||
|
Foro de la Asociacion de Detectoaficionados de Extremadura
Spanish metal detecting forum.
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 |
|
|||||||||||||||
|
LongRangeLocators.com
The world's largest forum dedicated to the discussion of LRLs and related devices.
Topics: 0
Posts: 0
|
0 | 0 |
|
|||||||||||||||
There are currently 2380 users online. 107 members and 2273 guests.
Most users ever online was 9,312 at 04:42 PM on 04-26-2025.
-
Yesterday, 03:58 PM
-
I researchED the booklet, and wrote it too!!!!!!!! I studied GEOLOGY, studied lots of the earth sciences too... Tried to stick into this forum, but it is too large
of a booklet..........I might send it to Carl Moreland, after I change it from a DOC file into a PDF file, and let Carl stick it into...04-30-2025, 06:15 PM -
Arduino mega flc 100 code send data with Hc-05 ?04-29-2025, 07:47 PM
-
Would this circuit topology work for such a task. In this circuit, Vout is proportional to V1*V2. The F.E.T's conductance are matched to within+\-5%
Can the circuit can be tweaked for X and R channel inputs to give target information.
What do you think? This circuit is featured...Yesterday, 03:58 PM -
I came across this page "Pulse induction metal detector with DSP" by Lammert Bies.
https://www.lammertbies.nl/electroni...metal-detector
It includes this diagram of three decay curves :
- no target
- ferro target
- non ferro target
...04-23-2025, 01:25 PM -
Hello ,this is my aportation for this 2011 year for all my friends of the Geotech Forum...
It is about the legendary BARACUDA...yes i have bought with a good LUCK a 2 hand old model from 1994 ...i test it very nice ...detect in air= alum.coca can at 65 cm very well and gold ring (20mm)...01-28-2011, 02:19 AM -
Please help me...04-28-2025, 09:38 PM
-
It is very difficult to find anything in the book that is not very interesting.
But I immediately decided on the Bipolar PI design as the first thing to focus on.
There are several reasons for that.
First, I like the idea of a "non-invasive" detection method because...01-07-2025, 08:56 AM