Real clone Alonso-PD

[Dubulumach]

WoW .... nice photo .
It taken exactly before 16 years, November 2007
Years gone....

Hi Geo
Make new photo with lrl. Nowdays.

[Geo]

I went for T.H 3 days ago but forgot to take some photos. Next time

[Pahom]

With ferrite "out" of coil is more easy to null the signal of passive receiver. But original Alonso;s PD is different.

What is the difference?

[Geo]

Inside the circle of coil is vedry very difficult to null the signal. If u have n't a very good null then u have saturation on receiver.... This is the big problem.

[Pahom]

Inside the circle of coil is vedry very difficult to null the signal. If u have n't a very good null then u have saturation on receiver.... This is the big problem.

Are you talking about zeroing the Tx signal relative to the Rx coils of the metal detector?

[Geo]

No, zeroing the Rx signal of passive receiver that becoming from Tx .

[Pahom]

No, zeroing the Rx signal of passive receiver that becoming from Tx .

Got it! Thanks Geo. It turns out that with such a system in a passive receiver you need to put transistors with h21 with a very high gain. In the Franco Italy scheme, it is recommended to put h21 not lower than h21-500. With what minimum gain do you use in the passive receiver Alonso or when using a stimulator, it is enough not lower than h21-500.

[Faraz]

1.5 V Bat with 40cm wire my PD sens from 2.50m (when is in max critical adjust)
also with max critical adj , Locating FRESH Gold or Silver from 1.50 meter .

Regards

Hi humhum
Hello, I have been reading your posts, and I’m very impressed with how well your device is performing. Based on the details and explanations you have provided, congratulations on achieving such good results. I’m really glad that you were able to get your system working successfully. I wanted to ask whether you built your device using Mr. Andreas’s PCB, or whether you are using a different PD design.
Could you also please clarify the transistors you used? Are they the versions with the “C” suffix? In other words, are their beta/HFE values in the range of approximately 400–600, or are they higher?
I would really appreciate it if you could tell me exactly which design you used to build your device. I would like to build one myself, but I’m not sure which version would be the better choice.
Would you recommend Mr. Andreas’s PCB design or Mr. Max’s design? Which one did you personally build and test?
Thank you very much for your time and for sharing your experience. I would really appreciate any advice you can give me.

[Faraz]

Hello Mr. Behnam,
You explained everything very clearly and precisely.

Could you please tell me if you built your device based on Mr. Andreas’s design?

How many centimeters is the detection distance for the 1.5V spark test?

At what distance can the device detect an 8-gram gold coin?

Thank you very much for sharing your experience.

[Faraz]

Hello All
How this poroject pd its a better?
handwriten by Mr,max our Mr'andreas project?
and how is this heathkit project?
Regards

[Pahom]

Hello All
How this poroject pd its a better?
handwriten by Mr,max our Mr'andreas project?
and how is this heathkit project?
Regards

Without an assistant or knowledge of the setup, it won’t be easy. And this applies to any project!

[Faraz]

Without an assistant or knowledge of the setup, it won’t be easy. And this applies to any project!

Thank you, my dear friend Pahoom. I have built various projects so far—such as long-range frequency-based metal detectors, several "Franco-Italy" units, Mr. Morgan’s infrared design, and various ion detector models. However, regarding the "PD Alonso," I have heard it is very difficult to build, and the information available is scattered and confusing; for instance, there isn't a single, comprehensive package containing the schematics, PCB layout, and parts list all in one place. I hope you view this as constructive criticism rather than disrespect; I sincerely appreciate your valuable input. If experience is the key factor, then I certainly agree with you. My goal is to seek guidance from experienced members, and I hope they will be kind enough to share their knowledge with me.
Regards❤️
faraz

[Pahom]

Thank you, my dear friend Pahoom. I have built various projects so far—such as long-range frequency-based metal detectors, several "Franco-Italy" units, Mr. Morgan’s infrared design, and various ion detector models. However, regarding the "PD Alonso," I have heard it is very difficult to build, and the information available is scattered and confusing; for instance, there isn't a single, comprehensive package containing the schematics, PCB layout, and parts list all in one place. I hope you view this as constructive criticism rather than disrespect; I sincerely appreciate your valuable input. If experience is the key factor, then I certainly agree with you. My goal is to seek guidance from experienced members, and I hope they will be kind enough to share their knowledge with me.
Regards❤️
faraz

Well, yes, you wrote everything correctly, and I agree with you. It’s better to write via email. It’s very rare to get onto the forum. Sanctions have been imposed not only on YouTube but also on many websites. I’m surprised myself how I manage to get through. To the forum!

[Faraz]

Well, yes, you wrote everything correctly, and I agree with you. It’s better to write via email. It’s very rare to get onto the forum. Sanctions have been imposed not only on YouTube but also on many websites. I’m surprised myself how I manage to get through. To the forum!

Thank you so much. You are right; between the internet filtering and the prevalence of various sites, it took me a month of repeated attempts just to sign up and post—likely due to the viruses present online. I am very grateful for your reply; it is a pleasure to hear from you. I do not have your email address; if possible, please share it via a private message or right here. With great respect,

[Hosin@2021/shahroee]

Mr. Qiaozhi's schematic is correct and has no problems. You should get a long range when you add the ferrite section