Voodoo Main Discussion

[MartyJ1963]

@Qiaozhi,,,Thanks for the info and the document,,,learnt something new! @Lamois,,Thanks for the link but I think this bagful I have here, according to the info, will do the job. Thanks, Regards, Marty.

[dbanner]

I'm in strong objection to the name of this project.
Sounds like I may never return from a treasure hunt!

"It was the Voodoo detector that finally did him in"...."we found his body half way down a 2 meter hole clutching a shovel in his hand....the metal detector he was supposedly swinging was nowhere to be found"

I'll order the book. Thanks for the project.

[Phantom]

George,


Reading a little more of this interesting book, a new question arises. On page 29, when describing TP5, at the end of the paragraph it says:


... the Troy coil (Fig. 3-18 ).


Shouldn't it say the following?


... the Troy coil (Fig. 3-16).


Greetings to all

Phantom

[Qiaozhi]

George,


Reading a little more of this interesting book, a new question arises. On page 29, when describing TP5, at the end of the paragraph it says:


... the Troy coil (Fig. 3-18 ).


Shouldn't it say the following?


... the Troy coil (Fig. 3-16).


Greetings to all

Phantom

Yes, that should be Fig. 3-16. I'll add that to post #1.
I can see a future proof reader ...

[Phantom]

Yes, that should be Fig. 3-16. I'll add that to post #1.
I can see a future proof reader ...

George,

For years as part of my work I had to write technical documents. I read each document some times to correct misprints and mistakes. But if you are the author, you can read a hundred times and you aren't able to see a lot of them. You pass over as the document was perfect.

Later, when you put the document for review by the rest of the team members, that's when the errors appear and hit you in the eyes. This is inevitable, don't worry too much.

Regards to all

Phantom

[Qiaozhi]

George,

For years as part of my work I had to write technical documents. I read each document some times to correct misprints and mistakes. But if you are the author, you can read a hundred times and you aren't able to see a lot of them. You pass over as the document was perfect.

Later, when you put the document for review by the rest of the team members, that's when the errors appear and hit you in the eyes. This is inevitable, don't worry too much.

Regards to all

Phantom

Yes, I know. Same thing happened with ITMD. Carl and I read and re-read it 100s of times.

Talking of errors ... I notice that your account name is Phatom, but you sign off as Phantom. Would you like me to correct that?

[6666]

PCB's have arrived no thanks to dhl,
they look good, now the longer wait for the book.

[bernte_one]

coil shell

i want to draw a concentric coil shell for 3d printing

it should have 280mm outer diamater,
what inner diameter is best choice / relation ?

[Phantom]

Yes, I know. Same thing happened with ITMD. Carl and I read and re-read it 100s of times.

Talking of errors ... I notice that your account name is Phatom, but you sign off as Phantom. Would you like me to correct that?

Gerorge,

Yes, this is the clear example of a typing error. Then I did not know if trying to correct it would lose my account


I would be very grateful if you made this change. Thank you very much


Cheers to all

Phantom

[Qiaozhi]

Gerorge,

Yes, this is the clear example of a typing error. Then I did not know if trying to correct it would lose my account


I would be very grateful if you made this change. Thank you very much


Cheers to all

Phantom

Done!
Glad to be of service.

[Qiaozhi]

i want to draw a concentric coil shell for 3d printing

it should have 280mm outer diamater,
what inner diameter is best choice / relation ?

Well that's a good question, and one that I raised at the end of Chapter 7.

Personally I like the ratio used by the Laser and Tesoro coils.
Using the outer diameters of the loops as a reference, the Laser has 9" (229mm) and 3.75" (95mm), which is a ratio of 2.4:1.
Whereas the 12" (305mm) White's coil has an inner loop [outer] diameter of 6" (152mm), which is a ratio of 2:1.
I find that the smaller diameter inner loop provides better target separation. However, having a smaller diameter requires more turns to achieve the same inductance.
Based on a ratio of 2.4:1, this indicates an inner loop [outer] diameter of 117mm for the 280mm coil.

[Phantom]

Done!
Glad to be of service.

Thank you very much George

Regards

Phantom

[MartyJ1963]

@Qiaozhi,,,Regarding the depth that the Voodoo is capable of, what would be a reasonable estimation of depth say for a 7" coil compared to a 9" coil please? Personally I'm not looking for any extreme depths as such as I think around 8" depth is ample for me for Inland detecting. The esimation will help give me an idea of which coil/coils to build for testing once I've built the Voodoo. Thanks George, Regards, Marty.

[Carl-NC]

Yes, I know. Same thing happened with ITMD. Carl and I read and re-read it 100s of times.

I proof-read the entire Voodoo book twice, still missed things. I think a better proof reader is someone who is not very familiar with the topic.

[Qiaozhi]

I proof-read the entire Voodoo book twice, still missed things. I think a better proof reader is someone who is not very familiar with the topic.

Your assistance was hugely appreciated, especially as you caught a huge number of errors. In particular, your comments on Appendices C, D, and F were invaluable. Someone not very familiar with the topic could not have helped in that case.

Maybe a combination of familiar and not familiar is the key to an error-free result.