Pulse Star II (first analog version)

[WM6]

Nice speaker! (post #39)

I use pc speaker buzzer and made magnetic shield for that speaker, from aluminium pipe.

Vadim, aluminum is not material that can provide magnetic shield. But It is good as RFI shield.

[Vadim18]

Vadim, aluminum is not material that can provide magnetic shield. But It is good as RFI shield.

Yes, but aluminium shield form closed loop outside of the buzzer.
Same electromagnetic shield for transformer
My shield on pc buzzer

It better to use copper foil and more than one winding.

[ivconic]

Yes, but aluminium shield form closed loop outside of the buzzer.
Same electromagnetic shield for transformer [ATTACH]53146[/ATTACH]
My shield on pc buzzer [ATTACH]53147[/ATTACH]

It better to use copper foil and more than one winding.

Are you really using a buzzer?!?
Does it not having awful and tiny sound?
Have you heard alive PS II ?
Not on Youtube (Youtube sometimes degrade sound too much), but in alive?
PSII audio is having very pleasant and mighty depth.

[Vadim18]

Are you really using a buzzer?!?
Does it not having awful and tiny sound?
Have you heard alive PS II ?
Not on Youtube (Youtube sometimes degrade sound too much), but in alive?
PSII audio is having very pleasant and mighty depth.

Yes, i use ordinary pc buzzer in delta pulse. It sounds better than piezospeaker from clock)
loudness is near around acceptable and i already tested it in field.
Yes it sounds more like a toy, but audible.
No i havent, gues with 50% duty cycle vco and nice speaker it make sound like sportcar engine

[ivconic]

Yes, i use ordinary pc buzzer in delta pulse. It sounds better than piezospeaker from clock)
loudness is near around acceptable and i already tested it in field.
Yes it sounds more like a toy, but audible.
No i havent, gues with 50% duty cycle vco and nice speaker it make sound like sportcar engine

I made lot of Delta Pulse copies so far, you wouldn't believe; but i lost count after 75 units!
Even now i have prepared pcb to make one, just as i finish with PSII.
In each of those Delta Pulse diys i used 8 ohms speaker, never buzzer nor anything similar.
If you mount some sort of barrier within detector enclosure, something like small acoustic resonating "box" with speaker in it; it will sound very deep and pleasant too.
There is always a same "trick" with small enclosures and speakers, how to achieve loud and powerful sound from it.
It's not about the speaker, it's all about the acoustic volume around the speaker.

[Vadim18]

Wow, thats numbers is impressive)
I made one unit just to try how good it is, and to try it in local arheological excursions with my friends from museum.
Yes, aditional resonance camera do work.
Thanks for the advice!

[Jose]

I made lot of Delta Pulse copies so far, you wouldn't believe; but i lost count after 75 units!
Even now i have prepared pcb to make one, just as i finish with PSII.
In each of those Delta Pulse diys i used 8 ohms speaker, never buzzer nor anything similar.
If you mount some sort of barrier within detector enclosure, something like small acoustic resonating "box" with speaker in it; it will sound very deep and pleasant too.
There is always a same "trick" with small enclosures and speakers, how to achieve loud and powerful sound from it.
It's not about the speaker, it's all about the acoustic volume around the speaker.

Excellent work Ivconik, with the Pulse Star II.
Could you tell us what difference is there between PSII and Delta Pulse, for example sensing distance, response time etc etc? Thank you.

[ivconic]

Excellent work Ivconik, with the Pulse Star II.
Could you tell us what difference is there between PSII and Delta Pulse, for example sensing distance, response time etc etc? Thank you.

If Delta Pulse is made good; than there are not significant differences in final performances on soil.
You don't get much more with PSII in depth nor in sensitivity.
But yet there are small differences. PSII is bit more agile and faster on response.
I prefer it over Delta Pulse only for one simple reason: it has less "knobs" to adjust and turn and it is much simpler in use.
Delta Pulse can be also made and trimmed to work just fine. Also some of the "knobs" can be fixed values.
You asked me tough question. I really don't know how to answer properly. I like them both.
But let's just say that i am now in PSII "mood". I'll make few of those and than pass to something else.
This is hobby. Make one diy at the time, sell it to return invested money and pass to something else next.

[Jose]

Thanks Ivconic.
For me it is also a hobby and I always try to try some mod to improve the DP.
Sometimes we get some success, other times not, but we continue rehearsing.

[ivconic]

Thanks Ivconic.
For me it is also a hobby and I always try to try some mod to improve the DP.
Sometimes we get some success, other times not, but we continue rehearsing.

From this perspective now, knowing what i learned in meantime; for me is better to have one, two.. maybe few fixed and accurately known delay presets; than to have potentiometer like on Delta Pulse and always turning it randomly.
PSII is having 4 delay presets, fixed. And i am using "1" most of the time.
Only with coil 2x2m is beneficial to switch it to "4" when search for indeed large objects.
I almost never used "2" and "3", except in case of a very "hot" soil. Rare case.
So, the same could be done at Delta Pulse. Instead potentiometer to put just few fixed values.
With same coil only one fixed value is enough. Maybe two. For normal and "hot" soils.
Those are "slow" coils and detectors and without GEB feature, not nugget hunters. Therefore no need for wider delay adjusting range.
PSII is really sensitive and "deep" at "1" and very slow and "deaf" at "4".
Therefore at "1" it can react to soil sometimes. Sometimes is enough just to lift coil few inches from soil.
I don't search for small and medium sized objects with it. I have Deus for that part of a job.
PSII with 60x40cm coil (at present i made that one) can reach deeper than Deus for larger objects.
So all ends up in combining the detectors in different kind of searching.
For that purpose Delta Pulse is good the same.

[Orbit]

Puls Star 2 is very stable it is much more stable than delta pulse,and secondly every device almost always turn out exactly the same when u do...difference PS 2 and PS 2 pro does not exist ,i would say the analog is more stable I almost compared analog and pro "discrimination" it is better on analog than pro!You can also improve his work influencing the delay control processors and you can't play with it, there are little tricks that improve the depth of PS 2 and stability....Each have their own opinion but it is my opinion that Delta Pulse much worse combination from the DBP 2100 or Superdec and Pulse Star 2 or Lorenz ! Superdec for example has a pulse width which is just for coin hoards . Eric Foster described pulse width for coin hoards 500-800us...I almost measured. Superdec reworked tonal part as on PS 2.

[Jose]

The PSII, being a more elaborate machine, may have some advantages over the PD.
The DP, I think it can be improved, as Ivconic says, you can remove some controls from the front, the first one I would remove is the control of the second sample. The delay control has already been described by Ivconic. The power control could be done with a two-position switch, I would choose one of 100 us, and the second in 200 or 300 us.
I am testing a mod to improve stability, and it consists of reducing the gain of the first stage, recovering it in the later stages, also with a switch I modify a filter obtaining a faster response, in a kind of sat control, useful when using coils smaller. They are simple mods that seem to work by improving stability, noise, overall nice performance, even with 1m X 1m spools. But I have to do more tests to be sure. It happens that the EMI exterior noise varies in the times of the year, and these days it's low here in the area where I'm living.

[Vadim18]

You 100% right Jose, thats why in my DP i use only 3 regulators and one switch at front panel for gain selection.

[Vadim18]

Anybody use magnetic reed switch for reset button?
Almoust contactless, provide 2 cm distance. No dust and mud on front panel.

[Jose]

Anybody use magnetic reed switch for reset button?
Almoust contactless, provide 2 cm distance. No dust and mud on front panel.

On the last DP I built, I use the mod I post KT315, it automatically reboots when I turn on the detector.