Searching for a new project

[Prospekteur]

Im searching for a new homemade project;-). Since ive built two different Tgsl and a surf pi its been a while.......so its time now to build a good higher frequency detector;-)

-Is there somewhere a Pcb layout for an high frequency detector like fischer goldbug 2.

Which layouts are known in the 18 Khz range.

I only know about the Tesoro Lobo layout. What else?

Regards Prospekteur

[Koala]

Nothing as far as I know.

No new projects for some time.

Most of the new machines are mostly done in software. Nobodies copied them. As far as I know the schematics aren't available for the GB2

Fortune M3 goes up to 20khz but know nothing about it.

[waltr]

As Koala said, most newer detectors are doing lots in software on micro-processors.

Any interest with diving into code?
If so maybe a PI detector using a processor like the Hammer Head PI I having been working on. See the thread in the HH II sub-forum "My take on the HH2".

If a VLF Detector running at higher frequencies then start with a good VLF detector and re-design for higher frequency.

[Prospekteur]

waltr: "If a VLF Detector running at higher frequencies then start with a good VLF detector and re-design for higher frequency."

thats exactly what ive tried with tgsl.....but i gave up to try it.....it has to do with the capacitors. Ive tried a few things with adjustible capacitors but gave it up;-)

I need a working layout to work with. The goldbug 2 or something similar would be great.

[Nandor]

Hi
Magnum VLF from Ivconic it works at many frequencies,8-10-14-18kHz you just have to choose than change the tank capacitors corresponding the frequency!

[Prospekteur]

Thanks.....Magnum looks really great!


When its possible to change frequency with a switch on this circuit.,.....this project would be the way to go for me! Can i get a link to the best layout and partlist?

[Nandor]

It's a very versatile detector, you can use a switch and select between 2 different frequencies. I don't have all the doc's to build it but it would be better if you would read the thread! Good luck.
Golden Mask detectors from Bulgaria sell coils too and the one for Golden Mask 4 WD matches this machine it is a copy of it. The coil is under 100 euros if you can afford it than it makes your job a lot easier.

[Prospekteur]

Thank you very much! I will buy a coil and build the rest at my own. If someone have the final layout and partlist.....please let me know.....

[Tim]

Very good Propekteur. Of the GM's GM4 looks the best to me. Looking at LF detector coils, the GB/pro is TX 850uH and RX 8.5mH,(19kHz) and Goldmaster TX293uH Rx3.07mH (48-50kHz), so a 10 to 1 ratio may be a good starting point for designing a 20-70 kHz detector coil. It may be beyond my ability at this stage, but surely this is do-able ??? Just some component fiddling on the RX circuit ??? GB original uses a 10:1 transformer there, but there is likely other ways around the adaptions.Perhaps this is to compensate for the coil ratio??
Blacksoil ID, Ferrous/non-ferrous ID, discrim, VSAT, GB, VCO...How hard could it be...?

[bernte_one]

Build a felezjo pi and design a pefect coil for it.
I have biuld two working Units so far one for deep searching and another one for coin hunting
impressed how good they work, biut coil desgin is a Little bit tricky

[Prospekteur]

Hi Bernte��

Felezjo looks great too.......the discrim seems to work fine for an pi. But i need a better vlf discrim for really small targets.

How do felezio discriminator perform on small targets. Lets say smaller as a coin ?

[Tim]

I bought another roll of Cat5 networking cable yesterday for PI coil experimenting. Previously a 45x30 square mono with 3 rounds, connected orange,orange/white,yellow/yellowwhite etc in "rainbow" order worked well on both my XR71 and SMpro, detecting an Oz 10c at 40cm, but a 10x5 twisted, same connection order, was abyssmal-parasitic capacitance?
I think this stuff is worth more experimenting. Basket weaves are good. 3DSS apparently better, but I will try the Cat5 in other internal connection order.
I am eagerly awaiting my Impulse2 (Tech Forum post) for some testing. It is micro-controlled with adjustable delay and width, but I am unsure of its min and max parameters.
For gold I have 3x 15kHz detectors Ricomax "Gold",GC1006 & Garrett Groundhog (best of these). [email protected]/32kHz w/Coiltek6DD (better than Groundhog), and GMT E-series (better again).
I hold great hopes for the Minipulse KRinAZ (will try my ML10x5CommanderDD or Coiltek11DD on that first) and much interest in the IGSL Musky, which I purchased an FBS 10 inch for today. Also have a Newhobby 2 board Magnum to assemble.........

[Prospekteur]

"Also have a Newhobby 2 board Magnum to assemble......... "

why this weird smiley......the newhobby pcb is not smd and should be easy to build........did you have problems with this pcb????

[Tim]

No Prospekteur, I just have too many great projects on my list. But because I am suffering Stage IV Pancreatic cancer, and have so many bad days, I am having trouble getting them completed. Also it seems every time I peruse this fabulous site I find another distraction requiring my attention. Currently I am trying to complete 2 simple BFO types, that worked but needed improving. But they too are sitting uncompleted. Not to worry. In the meantime I am reading here and broadening my knowledge. Also sometimes it doesn't pay to jump straight in to something-several of my future projects I have decided to modify before starting them after additions and mods have been posted by the wonderful people here.
It is all good, and I look forward to your success with the Magnum. I will make mine a DD coil, as I did not order the Omega way back when I got the boards..