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.
...
Announcement
Collapse
No announcement yet.
Announcement
Collapse
No announcement yet.
Forums
Collapse
Collapse
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: 61
Posts: 697
Last Post:
Probe PCB from Silverdog
|
61 | 697 | ||||||||||||||||
|
ITMD3
Discussions concerning content, circuitry, source code, etc for the 3rd edition.
Topics: 23
Posts: 622
Last Post:
ITMD4
|
23 | 622 | ||||||||||||||||
|
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: 5,599
Posts: 86,494
Last Post:
IDX-PRO+VDI
|
5,599 | 86,494 | ||||||||||||||||
|
PI Technology
Tech discussions specific to Pulse Induction
Topics: 458
Posts: 25,245
Last Post:
Sniffer XR-71 help
|
458 | 25,245 | ||||||||||||||||
|
Coils
Same as the Tech forum, but coil-specific.
Topics: 2,353
Posts: 24,945
Last Post:
DD-Coils made by Eric Foster
|
2,353 | 24,945 | ||||||||||||||||
|
Modifications
Detector mods, plus any other useful add-ons.
Topics: 761
Posts: 7,839
Last Post:
Metal detector Detech EDS Reacher
|
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 | ||||||||||||||||
|
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
Last Post:
Manticore Achilles heel
|
79 | 1,405 | ||||||||||||||||
|
Magnetometers
Tech discussions on mags.
Topics: 751
Posts: 4,264
Last Post:
trimpot adjustment
|
751 | 4,264 | ||||||||||||||||
|
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 | ||||||||||||||||
|
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
Last Post:
AI can't invent. AI isn't creative.
|
207 | 2,230 | ||||||||||||||||
|
General Electronics
Cool circuits, tips, techniques, PCB methods, test equipment, etc.
Topics: 603
Posts: 5,957
Last Post:
Adjustable gain pre-amp
|
603 | 5,957 | ||||||||||||||||
|
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 |
by Kennywhites
07-24-2026, 03:08 AM
|
|||||||||||||||
| 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:
| ||||||||||||||||||
|
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: 1,092
Posts: 5,718
Last Post:
carbon fiber holder
|
1,092 | 5,718 | ||||||||||||||||
|
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
Last Post:
Whites complete inventory up for auction
|
192 | 1,047 | ||||||||||||||||
|
Melbeta's Vintage Files
Unique vintage metal detector info donated by denizen 'Melbeta'.
Topics: 91
Posts: 606
Last Post:
Discrimination just does not work!!
|
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 |
by Rama2389
02-10-2025, 12:48 PM
|
|||||||||||||||
|
Forum Issues & Feedback
Problems with the forums? Suggestions for improvements? Post them here.
Topics: 4
Posts: 32
Last Post:
Getting back on off topic
|
4 | 32 | ||||||||||||||||
| 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: 1
Posts: 2
Last Post:
What can they do?
|
1 | 2 | ||||||||||||||||
What's Going On?
Collapse
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
Collapse
Topics: 17,952
Posts: 252,440
Members: 6,651
Active Members: 420
Welcome to our newest member, Mmm.
Latest Topics
Collapse
-
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...-
Channel: Tech Forum
07-27-2026, 05:26 AM -
-
by AedellHello 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...1 Photo
-
Channel: Schematics
07-26-2026, 05:13 PM -
trending
Collapse
-
by eduardo1979Hello. 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...
-
Channel: Tech Forum
08-21-2011, 11:40 AM -
-
by aft_72005Hello
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.
...-
Channel: Schematics
Yesterday, 09:04 AM -
-
by JafarHi 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....-
Channel: PI Technology
10-05-2025, 05:09 PM -
-
by NovaG'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...
-
Channel: Coils
07-25-2026, 10:50 PM -
-
by OctopulseHello 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...-
Channel: PI Technology
07-21-2026, 10:53 AM -
