A technical question about one PI

[michael]

Every knowledgeable electrician here: Esteban, Carl, Kt315 and others!Is it technically possible a PI MD be with these info;
Pulse Rate: 400 Hz
Pulse Length: 150 - 250 µs
Peak Height: 900 V
Peak Power at 250 µs Pulse Length: 600 - 700 W
Coil Impedance: 1,8 - 2,5 Ohm
coil current: bigger than 10 A.
power supply: 21 volts
Would you please answer my question? thank you.

[Carl-NC]

Sounds possible, though I'm not sure what you mean by "peak power". Where does 600W come from?

[Unregistered]

Yes, it is real. Those 600W should be divided by the duty cycle. These conditions can survive only a tandem of transistors, I use bipolar ones. Sid

[michael]

Thank you. As there is a firm in germany that has been claiming since 2 years ago have produced this powerful PI. and claims it's the only PI MD with complete digital system. I always think about how accurate and how trustworthy could be.
this is it's address
http://www.detector-trade.de/English/DTI-Puls.htm

and it's best unit name is "GENESIS". please put your ideas.

[kt315]

http://www.findmall.com/read.php?34,...928#msg-213928

'A boat towed PI designed to look for cannons would likely use 1000uS.' (in your case - 150-250 us)
is it your idea? deeper PI? we have Delta Puls (not Pulse) at least from our Bulgarian camrades, so there is not sharp need. or. you can take Hammerhead-PI and do re-tuning what you want at all...

[Carl-NC]

I agree, even HH could be made to meet those specs, though I would add some heat-sinks.

Still don't get the 600W... 10 amps @ 21v is only 210W, and averaging it out only makes it less.

[Seeker]

Every knowledgeable electrician here: Esteban, Carl, Kt315 and others!Is it technically possible a PI MD be with these info;
Pulse Rate: 400 Hz
Pulse Length: 150 - 250 µs
Peak Height: 900 V
Peak Power at 250 µs Pulse Length: 600 - 700 W
Coil Impedance: 1,8 - 2,5 Ohm
coil current: bigger than 10 A.
power supply: 21 volts
Would you please answer my question? thank you.

Hi Michael.
It is normal peak power to be 700W for 10A and 900V .Look at the picture:
when you off the current , the selfinductance of coil produce hi voltage -900V. Becouse the current in this moment is not 0A(2-1A) and you multiply current by voltage you will have 700W or more for this moment(about 40uS).
That is all ! It is simple!

[Unregistered]

JC1

Hi Michael,

Thanks for the information.

Didn't know somebody was doing this for sale.

Yes this is the beginning on building your own

deep seeking PI metal detector.

Haven't read the manual yet, but if you build

something like this (talking about xmit power)

there are a few things that need addressing.

One is that your damping resistor can get very hot.

And will be huge!!! especially in metal film (many

resistors in series and parallel depending on how much

POWER you desire for your hunting.

You will need batteries, noticed these cost 222 EUROS.

and need a 1.2 amp charger.

Sounds about right.

A warning if you try to build this animal as I have

years ago. With exposed terminals on your prototype

you can be electrocuted or at least bitten very hard.

(I have proved this one)

The RF field is also very high.

Exposure to such fields might effect your health.

Have Fun

Meters instead of Inches?

Could be.

http://www.detector-trade.de/Datenbl...%20english.pdf

[michael]

Thank you for your attention.
Kt315, do you mean your HH PI works as powerfully as, this PI?
of course we know the depth penetration isn't enough, the accuracy,
precision and consistency are as significant as power.
does your HH PI these features? My PI (Luminous) have all of them, but
don't think be able to pervade deeper than 3 meters. whereas you see this
PI which is 5th generation of PIs has overwhelming results. specially you see its' discrimination is unbelievable ( if not be just an hollow ad)
I had a connection with them in Wed, 23 Nov 2005
this was my e-mail:"...Isn't it possible to give the e-mail of some Genesis owners? I want it for exchanging practical field information one question; the unit with this power sensitivity, doesn't detect "viscous magnetisation"?..."
this was the answer:
"...I have printed out that essay about "viscous magnetisation".
I need to study that at home. I will translate and publish on our English websites within the next days. Most of our Genesis owners came to our office to buy and to have a training. Most of them don't give us their Email-addresses - and if we can't give their addresses without their agreement.
I understand that you need to know more about that detector. I only can give you what I have and we will try to do more in English. Attached you will find a test report - in French - . You possibly will understand. This test has been made by a French magazine. Best regards, Bernhard Boonk"
I never got if detects viscous magnetisation or not.

they attached for me a file from a French magazine researching about GENESIS. at the end see the French and tranlated to english (by babel fish) :
The only thing they whine for is high weight due to the battery used in.
I think if everything about it be right, there is a deficiency; cannot use external feeding.
Seeker, thank you for elucidate explanations.
Unregistered, I have no decision to build it cose I'm not electrician or have time to do it I'm just a user like as most of people.
If anybody here have decision to buy it please inform me. I am so much willing to know the practical results. We were incline to order it, but now if mineoro FG 80 be approved is in preference, maybe in future we prepare it.

[michael]

Oh, I forgot to ask; Which characters are as main indicators in PI MDs power and accuracy?
in one book I read VLFs (Fr. lower 30 KHz) are better for accuracy and real VLFs(lower 1 KHz) are the best.
RVLFs are exhaustive accurate and never detect minerals.
in DTI site you see they introduce pulse Peak Height(900 V),Peak Power(600 - 700 W) and coil current(10A) as factors for penetration power .
What's your idea ? How true is this?

[michael]

Hi all. Why nobody answered my above questions?
Please give your info and consults.
Is there anybody have decision to order this machine?

[Geo]

http://www.findmall.com/read.php?34,...928#msg-213928

'A boat towed PI designed to look for cannons would likely use 1000uS.' (in your case - 150-250 us)
is it your idea? deeper PI? we have Delta Puls (not Pulse) at least from our Bulgarian camrades, so there is not sharp need. or. you can take Hammerhead-PI and do re-tuning what you want at all...

Hi KT315. What about this Delta Puls?:confused:

Regards

[Seeker]

Oh, I forgot to ask; Which characters are as main indicators in PI MDs power and accuracy?
in one book I read VLFs (Fr. lower 30 KHz) are better for accuracy and real VLFs(lower 1 KHz) are the best.
RVLFs are exhaustive accurate and never detect minerals.
in DTI site you see they introduce pulse Peak Height(900 V),Peak Power(600 - 700 W) and coil current(10A) as factors for penetration power .
What's your idea ? How true is this?

Hi Michael,
I can't understand your question. VLF and PI have different principles of working.
What exactly is your question?

Regards

[michael]

Hi Seeker, although I'm not electrician, but know one thing( have read in a book) that VLF is abbreviation of; "Very Low Frequency" it can be each one of; BFOs, VCOs, TRs & PIs.
VLF is for Freqs lower than 30 Khz. e.g. White's Spectrum XLT is an VLF BFO which the operation freq is 300 Hz.
or from TRs; Discovery TF900 works in 2 freqs; 12 & 72-5 Khz. with 12 Khz is much reliable for metal detecting whereas in 72-5 Khz is more cavity finder, whereas Fisher gemini3 works only with 85 Khz and you hit predominantly the mineral piles or cavities.
In PIs you see nearly all of them are VLFs but in different frequencies.( some 2-4 Khz, some 300-400 HZ and some other in 400-500 Hz) all of them are VLF. but based on the book the less frequency (longer wave length) the more reliability and precise for metal detecting. when one PI MD works with freq lower than 1 Khz, it's cute (as DTI Genesis works). If I am wrong, you or others lead me please, I will be grateful.

[Carl-NC]

VLF detectors use a "continuous-time" waveform, usually a sinusoid, and measure amplitude and phase response.

PI detectors use a "transient" waveform, and measure decay rate. The pulse rate for a PI detector does not have the same effect as the frequency of a VLF.

- Carl