Pulse Star II (first analog version)

[ivconic]

Hi Ivconic,
If this detector isn't true VLF and isn't conventional PI, what beаst is it? Maybe this solution is from third, unknown kind (or not popular yet hybrid type)?

As I said; I have no basis for any claims. But it draws too much current for a regular VLF I/B.
And the "depths" in the air delighted me.
On some coins the "depth" in air was double the "depth" of XP Deus1.
In addition, it has a unique threshold behavior.
I'm pretty impressed with what little I've seen.
I'd say it's some kind of "hybrid-mixed-mode" detector (whatever that means!)
...
Ah yes, I must mention this; the coil that came with it... it said 7.5kHz on a sticker.
A friend told me that there are various coils for that detector, each with a specific frequency.
(this excludes the multi-frequency operation of the detector as we usually think of it)

[ivconic]

Post #60, here: https://www.geotech1.com/forums/foru...onik-stf/page4

[ivconic]

AKA Intronik belongs to that group of detectors where the user must dedicate himself to learning and understanding all the options.
Any small change in trim can make a big difference.
Someone will say; so it is with most modern high-end detectors.
Ok, I agree.
But while most "Western" high-end detectors follow a certain "standardization" in options, it's easier to navigate.
With AKA, some things are quite unclear (at least for me).
I realized that I would be wasting my time with it if I was trying to get instant results and it wasn't my detector that would stay with me long enough.
That's why I didn't make a special effort to learn even basic usage.
When (and if) I ever buy one of the better AKA models; I will make a special effort to learn it.
Although I did not know how to handle it; many years of experience give me the right to "feel" that this is a very powerful machine with extraordinary capabilities.
I am rarely wrong in such assessments.
Before my post #60, a couple of posts behind is a post with a link to a Youtube video.
Watching the video, it is very clear to me that even the colleagues on the video did not get to know the detector well enough and that they do not know how to adjust it properly.
Because in those days I watched a lot of other videos and in some of them I saw people who know very well how to adjust the detector and then the detector shows incredible results.
I think things are clear.
It's the same story with XP Deus 2 and ML Manticore.
There is a lot of "controversy" about the quality and capabilities of these machines.
I think it's too many options to adjust, one has to really commit to learning the machine.
I am someone who has been overtaken by time, the older I get the more I prefer detectors with as few "buttons" as possible.
And modern manufacturers exaggerate the number of "buttons" on new models...
But... the devil is in the details. From super performance to zero performance, these days it's just one or two slightly wrong parameters.
My friend has an ML Equinox 800.
He is constantly playing with the "buttons" in the field.
At one point Equ works perfectly for him, a real beast, and a few minutes later my friend is furious and asks for the first piece of wood to smash the detector against it.
The lesson: once you set up the detector to work well; remember that setting!

[kt315]

https://youtube.com/shorts/4aLsPUmg2...71gUckFHS-C4F3. https://youtube.com/shorts/m2DYWhcvv...po9bp0jrc_TV3i

Video unavailable
This video is private

can not look....

[algan]

The PS2 has a really interesting concept. A lot would be gained by adding GEB

Adding GEB to Pulse Star 2 is not a problem, the easiest way is with an external board without adjusting this one, but I still don't like the depth of mine and so I haven't decided to do a ground balance based on comments from colleagues. The original Pulse Star 2 has a completely different depth and I still can't figure out why my board doesn't work like the original, but this is a hobby and I experiment with whatever and whenever I can think of.

[ivconic]

The PS2 Pro I've mentioned a couple of times before, originally mine and later sold to a friend locally, is almost always at my disposal.
When I built the first few PS2s, I picked up a PS2 Pro from a friend to compare.
It's true, I didn't reach the same "depths" in the air either. I got about 85-90% performance.
I can interpret it in various ways. Different quality of components, this, that... but first of all I think it's the coil.

[Orbit]

With LF411, the device always has a smaller depth. The preamplifier needs LF357, but you may face the problem described. The cable is important, as is the inductance of the coil and the value of the damping resistor.

[Orbit]

https://youtube.com/shorts/m2DYWhcvv...qzSmgHKlz70IT8

[Jose]

I bought a PS2 module from AliExpress and am testing it.
The 150-volt zener installed next to the IRF630 isn't working. The MOSFET goes into avalanche mode at 200V, as can be seen with the oscilloscope, and it heats up slightly.
However, the zener works fine. I removed it and tested it with a variable power supply. Since I don't have a 51V zener on hand to test, I installed a 130V P6KE130A overvoltage protection diode in series with a 15-ohm resistor. The flyback is now limited to 190V.
Afterwards, I tested several coils I had available. The best one was a 45 cm diameter coil made with 660 uH UTP cable. The damping resistor installed in the detector box was 620 ohms. The coil also has a 2.2K resistor inside.
I installed a socket in the TL064's location, which is erased, to test other ICs. The LF444 works better than the TL064, as Orbita claims.
However, with the original IC erased, pressing the reset button with the coil near a brick adjusts the threshold and remains memorized. This doesn't happen with the LF444 and TL064 I tested.
Finally, the PS2 is working with good sensitivity and stability. I don't have an original detector to compare, but it is similar to the Orbita video.

[Orbit]

If it should behave like that, for example, you can test iron pliers to see if it memorizes approximately 10 cm from the coil, if it memorizes them, then the Ca3130 is fine, if it doesn't memorize or memorizes them further and you can't set the threshold, the problem is in the Ca 3130, which means it's fake! 033ml box that cola or other pizza should detect at about 110 to 120cm with Lf 444 with Tl 064 is less sensitive clock one click per second should be stable until the next reset.I did not find a 150v zener diode in any module, they were all 51v.

[Orbit]

If I understand correctly a damping resistor is put on the pcb? I also did not find a resistor inside, the original ones are only in the coil. It occurred to me that this is where the problem lies, because every time I remove the resin from the PCB, I always have a problem with the detector( The threshold) is not controlled.without the coil with the original parts. However, if someone has access to the original device, you can test your pcb on the original, you will see that the meter does not go all the way where it says the battery is full, but only in the first third of the meter, which indicates something that exists on the lm358, a missing component!?

[Jose]

Thanks, Orbita. I ordered the CA3130 and it should arrive this week. I hope it's not a fake. The 150V zener came with the module I purchased. The module doesn't include a damping resistor. I installed the resistor I was referring to in the coil and housing myself.
I'm researching the LM358...

[Orbit]

And in the third case, the lf357 preamplified

[algan]

Today I asked a colleague who had the original Pulse Star 2 and tested it with a 330 ml Coca-Cola can with air and a 1x1 meter frame. detected 1.30 meters. This is so that colleagues who make the board know what the capabilities of the original are.

[GeoMax]

Oh... the Pulse Star II detects a Coca-Cola can at 1,3m only? I expected much more.