Hobby Hybrid MD1

[Ivont]

The transistor Q16 is controlled from ALL channel. When some target is detected, this transistor enables the work of the final stage of the DISCRIMINATION channel to show the type of the target - Fe/non-Fe. For Fe target, The "Fe" LED lights up first and after that "non-Fe" LED lights. For non-Fe target this order is reverse.

Why does discrimination use a later signal? Is the discrimination block swapped with the right channel?

[Ivont]

Sorry, I understand now. This sample is being removed.

[dbanner]

A bifilar coil where the Tx and Rx coil are co-located(hence bifilar). How can we null such a coil, or do we even have to? See, you can have a DD bifilar, so you have an inductively balanced arrangement in which each half contains a co-located Tx and Rx coil. When the Tx is on(on both sides), both Rx coils can be made to cancel each other(post signal processing) because they are balanced in the DD arrangement. Fancy pancy switching could make this work or not.
A beautiful symmetry is what the scientists always look out for. Surely this one can't be useless.

It is not a bad thing just to throw ideas out there, maybe one will stick.

[Ivont]

Sorry, what is this about? That's another topic.

[Ivont]

Hi Karl! Is discrimination possible with a bifilar wound coil not with DD? In progress on..

What do you mean by bifilar? The bifilar coil will not accept any signal.What do you mean by bifilar? The bifilar coil will not receive any signal. No transmission, no reception.
It's a completely different story if you mean percentages.

[Orbit]

https://youtube.com/shorts/kpxFxxHMR...mKHR-7LafUyFKq. I mean this I wound bifilar with 3 to 4 turns of 1 inch and one start and end is connected to rx the other is connected to tx, on tx and rx must be the same damping, I experimented a little last winter with this coil tx width 100us and frequency 700hz. Like I said I didn't have too much time but it turned out that something made sense.?!!!?It should be noted that it is important where you listen during the transmission pulse, i.e. it is necessary to place the sample in a certain place during tx for the iron, there I still have the task of adjusting CH 1 and CH 2 to the SAT speed.You can see in the video that for the coin the swing needs to be slowed down and for the iron a bit of a fast swing above the coil, this is because SAT CH 1 and SAT CH 2 were not aligned.

[Detectorist#1]

Hi Orbit,
Your impressions at this stage are very raw. Calm and write new refreshed information what happened with this solution.

[Orbit]

Hi Orbit,
Your impressions at this stage are very raw. Calm and write new refreshed information what happened with this solution.

It's very simple, as I said, it's waiting for its time.. Vladimir... Otherwise, the video is real, it's not lasered like the big producers usually do. This really works! I am completely calm, the recording is from a few months ago, I had other jobs, I do not sell detectors like Mikron, etc... I work for my own needs. I don't know too much, but the blind hen also stings the grain.

[Detectorist#1]

Hi Orbit,
It is will be very good if your idea (and results) will gives some new results in TX-ON analysis of RX signals. The information for TX-ON analysis of Rx signals in PI detectors in ITMD3 book is not big, it is time for us to do more experiments in this area.

[Orbit]

Hi Orbit,
It is will be very good if your idea (and results) will gives some new results in TX-ON analysis of RX signals. The information for TX-ON analysis of Rx signals in PI detectors in ITMD3 book is not big, it is time for us to do more experiments in this area.

I have no idea about the book ITMD3. I didn't buy the book and really can't comment. The idea comes from Demon _ and after the experiments I came across a patent where it was written about this idea, but I really don't remember what the patent number is anymore.

[algan]

Metal detector with improved receiver coil

Abstract A pulse-induction-type metal detector in which the receiver coil comprises bifilar windings that are connected in series, opposing during the coil pulse and in series, aiding, following the coil pulse. Pick-up of energy by the receiver coil during the coil pulse is thereby minimized and the duration of oscillations is curtailed. Owing to the rapid recovery of the system from the flux change that is used to charge the target, the signal sampling gate can be positioned very close to the trailing edge of the coil-current pulse, whereby detection of targets with very short time constants is made possible.

[pechkata]

Hello everyone.
Maybe Vlado Lilov worked on this patent.
This is very good.

[Detectorist#1]

Hi algan,
I know for this relatively old patent. It is not so difficult to made PI MD with simple mono or DD coil with 3-5us delay. I have some experience with adding of MOSFET transistors as switches connected to RX coils. The influence of parasitic capacitances in switching transistors add of noise pulses in RX signals and the final result is not good. Well designed fast coil with good low capacitance cable are sufficient to reaching of 3-5us delay. But in practice, for these so short delays, the influence of the ground is very strong and the real benefit is doubtful.

[pechkata]

Hello Altra,

Having a 100% FE/non-FE distinction, whether it works everywhere, is actually secondary. Why? Watch detector videos on YouTube or Facebook. In 100 out of 100 videos, people don't give a damn what the detector says. People are always digging, even if they suspect it might be an iron nail. Therefore, a rough statement from the detector electronics FE/non-FE is fine for the vast majority of people. There will never be a 100% electronics that will work everywhere on this planet. Eric Foster realized that back then and therefore didn't pursue it any further.

Hello GeoMax.
As always you are right.

[Ivont]

This method looks good. Has anyone made a similar device?
https://www.geotech1.com/forums/foru...me=#post203837