Voodoo Main Discussion

[mschmahl]

Even if you order the book directly from amazon.com.au it stills ships from the U.S.A.?
Does Amazon Australia not have the ability to print-on-demand?

It?s the same in Germany. I have ordered on Amazon.de and it is delivered from UK.

[Qiaozhi]

Thanks Qiaozhi. Can the outer loop be multi-stranded wire (eg:-16 strand PTFE coated 600v 0.5mm wire), or should I use a single core wire with thick insulation? I have 4 types of copper enamelled wire at hand,,0.18mm,,0.25mm,,0.5mm and 0.72mm,,which would be best for the inner coil if I made the 'Large' concentric and the 'Small' concentric? Thanks for the guidance, Regards Marty.

Multi-stranded PTFE wire will be good for the outer loop. For the inner loop you can use 0.18mm or 0.25mm.

[Qiaozhi]

Red+Black= 14.6 ohms / 2.42mH
White+Green = 26.5 ohms / ?
Can't measure inductance at White+Green.

The inductance of 2.42mH is too high for a PI detector.
From my experiments I would suggest a range from 300uH to 500uH as optimal, although I did have good results from an inductance as high as 1.12mH.

[Qiaozhi]

I can obtain a coil for F75 and a coil for both GoldBug and Fisher F2. Is the F2 & GoldBug suitable for this project as i prefer the price on this one a little bit better.

What are the inductance values of the Goldbug and F2 coils?
I measured the F75 loops as TX = 696uH and RX = 6.9mH.

[Polymer]

The Voodoo Project <<- Click to view book on Amazon

A Pulse Induction Metal Detector with Iron Discrimination

Pulse induction metal detectors are very sensitive to ferrous (iron) targets, and one that can ignore iron has been a sort of holy grail for metal detector developers for some time.

The Voodoo Project is a written record of the author's personal mission to design and develop a working pulse induction (PI) metal detector that is capable of good iron rejection.

Voodoo is a hybrid detector with features of both a PI and a VLF. The design goal was to develop a PI that can be used both inland and on the beach. In particular, special attention was devoted to finding non-ferrous targets in areas infested with ferrous trash. Rejection is not based on target conductivity, as Voodoo provides true ferrous/non-ferrous discrimination.

This book is available worldwide exclusively on Amazon.

Thought I would post my "internal" parts list, might help someone, in addition to the BOM in Post 1.

I like having the pitch of capacitors known, as there often is a lot of choice when ordering
and I just hate forcing radial and box capacitors pins if they dont fit exactly.

Open for suggestions and errata of course, cheers, polymer

Voodoo_Pitch_Parts.pdf

[eclipse]

I'm not sure I couldn't find proper info /Goldbug and F2 coil data, but if any good I can obtain those on the really cheap side/.

But I've just managed to snatch a Fisher F75 SEF (Detech) coil for 1/2 of the price while the coil is brand new.
I also have original Minelab 28cm DD coil for SD2200, co-planar 45cm for SD/GPX (Detech); Vlf coils I have Minelab Musketeer (specs are really close to F75, need to recheck but probably TX inductance would be to high), I have XT17000 and FT16000 minelab VLF coils, DeepTech Vista Gold 28cm and 35cm which can also be measured if any good.
Too bad all my stuff is all scattered in several different locations so it's going to be a journey to put things in some order.

[Orbit]

Eclipse I don't think he'll work with coil for SD2200 or any of the gpx series because it is in my estimation in question more vlf detector ,right on I work with pi which uses a coil for VLF and for now it works great I work with OO coil and can work with concentric VLF coil...
And if help is needed Microelectronics I have a couple of good friends who work in Mikroe!

[lamoiz]

my copy arrived this day. I start reading and translating for the correct understanding. I am very happy. now i start work.

[MartyJ1963]

@Qiaozhi and 6666,,Thanks for the info guys, Regards, Marty.

[surfdetector]

Thought I would post my "internal" parts list, might help someone, in addition to the BOM in Post 1.

I like having the pitch of capacitors known, as there often is a lot of choice when ordering
and I just hate forcing radial and box capacitors pins if they dont fit exactly.

Open for suggestions and errata of course, cheers, polymer

Thanks for posting your list. That is good information.

[MartyJ1963]

Just out of curiosity, wll there be a Build file available for the Voodoo project, like the Minipulse plus, or are we able to build and tune the detector from information in the book? I've enjoyed what I've read of the book so far but I've still a lot to learn before I'll ever fully understand everything,,still, it's fun learning and I know I'm going to enjoy this project and learn a lot more along the way. Regards, Marty.

[bernte_one]

Thanks George for that nice stuff, got my book yesterday and read the first pages while eating some stracciatella ice in the kitchen, make more sense to me as looking greys anatomy with my wife ;-)

can you proved the source code / hex file direct as download? or as personel email?

are the any changes necessary at rev c gerber files or can i order a small batch for german customers already?

if mschmal, prospekteur and andi are interested i cand send pcb

[Qiaozhi]

Just out of curiosity, wll there be a Build file available for the Voodoo project, like the Minipulse plus, or are we able to build and tune the detector from information in the book? I've enjoyed what I've read of the book so far but I've still a lot to learn before I'll ever fully understand everything,,still, it's fun learning and I know I'm going to enjoy this project and learn a lot more along the way. Regards, Marty.

I hadn't really planned to create a build document for Voodoo as it's quite an advanced project. However it's a possibility if I get some spare time. It depends on how many problems everyone has during the replication.

[Qiaozhi]

can you proved the source code / hex file direct as download? or as personel email?

I will upload the hex file later today.

are the any changes necessary at rev c gerber files or can i order a small batch for german customers already?

if mschmal, prospekteur and andi are interested i cand send pcb

There are no changes to the Rev-C PCB, so you're safe to order a batch. Note that Silverdog will also be offering PCBs in his online shop if that's easier.
https://diydetector.co.uk/store/index.php

[Phantom]

Carl,

Thank you for attending all our questions. I add two more to the list.


- Is it possible that Figures 3-7 and 3-8 in the book are interchanged? Or are they taken at reversed polarity points?


- In addition to Silverdog providing the PCBs in his virtual store, I find it interesting that he also sold the programmed PIC


Regards to all in the forum


Phantom