Threshold Pot doesn't work

[h9361]

you can see all pulses in the video.

[Carl-NC]

I don't understand what it is you are trying to accomplish.

[h9361]

I have a question about reaching to 100-120us range, TX pulse width.
Do you think i can reach the range if i change C8 from 10nf to 15 nf (like crossbow)?

[Carl-NC]

You can increase C8 or R4.

[h9361]

Thanks.

[h9361]

Or modify it to use a 2-stage preamp like the Minipulse Plus.

Dear Qiaozhi,
I have some questions about your project, Vodoo.
Is it possible to tell me following values:
TX Pulse Width (us)
DISC Delay (us)
DISC Sample Pulse Width (us)

[Qiaozhi]

Dear Qiaozhi,
I have some questions about your project, Vodoo.
Is it possible to tell me following values:
TX Pulse Width (us)
DISC Delay (us)
DISC Sample Pulse Width (us)

For reference, these values are shown in the book on pages 54 and 55.
PI TX Pulse Width: 10us to 180us
PI Sample Delay: 15us to 50us
PI Sample Width: 20us to 60us
DISC Sample Delay = 20us to 100us
DISC Sample Width = 10us to 100us

All of these values are adjustable from the menu system, and need to be determined for whatever coil you intend to use.

[h9361]

Thanks.
Do you think i can use DD coil of GPX series?
Unfortunately, i have not your book, i will try to buy it.
Please see attached, is it possible to guide me how to adjust R22 (TP4)?
Thanks.

[Qiaozhi]

Thanks.
Do you think i can use DD coil of GPX series?
Unfortunately, i have not your book, i will try to buy it.
Please see attached, is it possible to guide me how to adjust R22 (TP4)?
Thanks.
[ATTACH]57567[/ATTACH]

I have not tried to use a GPX DD coil.
The trimmer is only there for experimentation purposes as explained on pages 20 and 21.
There are no guidelines on how this should be adjusted.

[h9361]

Is it possible to tell me what method you have used for disc between F/N-F?
For exp, Checking voltage of TX (inductance) or etc.

[Qiaozhi]

Is it possible to tell me what method you have used for disc between F/N-F?
For exp, Checking voltage of TX (inductance) or etc.

With all due respect, all your questions are already answered in great detail within the 152 pages of the book: The Voodoo Project.

If you are having problems ordering a copy of the book from Amazon in your particular country, the Book Depository can supply copies with free delivery worldwide.
https://www.bookdepository.com/Voodo...6996899&sr=1-1

[h9361]

Before everything, i have to thank Mr. Qiaozhi for sharing his valuable information (Voodoo).
I read all of Voodoo posts and i think i realized his method about discrimination.
1- According to users tests, i should tune RX coil in 10Khz via adding resonance capacitor.
2- I must adjust DiscDelay so that i see a ringing form in O-scope at DiscPreamp output.
Mr. Surfdetector has shown the ringing in his video and post.

Dear Carl,
As you know, you helped me about adding GB process (based on 4 delays) in my HHD.
It works very nice and easily removes mineralization, while we can stay in lower delay (10-25us).
Now, i want to develop my HHD+GB by adding DISC part of VOODOO. I hope you accept to help me to do it.
Please see attached, i can add a separate delay + pulse-width in my HHD for DISC-Sample and connect it to 4066.
My problem is at final output (DISC_OUT). I think the out is DC voltage, do you think i can connect it to TL072 and turn on a simple LED (only for F)?
Actually, my purpose is that first a target is detected. Then, check its F/NF via this method.
Thanks.

[Carl-NC]

Have you successfully built the Voodoo? Do you have the book?

[h9361]

Unfortunately, i have not book.
I think ordering book will take a lot time.
Is it possible to buy its electronic version (PDF)?

[Qiaozhi]

Unfortunately, i have not book.
I think ordering book will take a lot time.
Is it possible to buy its electronic version (PDF)?

There is no ebook version of The Voodoo Project.