Delta Pulse 2 (Turkish one sided PCB), needed advice ?

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Delta Pulse 2

	Delta Pulse 2 (Turkish one sided PCB), needed advice ? « on: June 02, 2016, 04:24:27 am »

Hi to All,
I'm new member and this is my first post, I built Delta Pulse 2 (Turkish one sided PCB) with coil 19 cm, enameled copper wire 0.4 mm (I just have one role of it) with 31 turn. So, my questions are:
1- How can I make my DP 2 metal detector sensitive to IRON with small pieces ?
2- What is the best frequency to detect iron with small targets ?
3- What parts of the PCB must be changed to be able for iron detecting even small pieces ?
4- any advice for coil ? and what is the best dimensions of coil ?
I'm looking for you answers and advices,
Thanks

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« Last Edit: June 02, 2016, 05:16:42 am by Mr.MohKuEng »	Logged

Timc

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	Re: Delta Pulse 2S (Turkish one sided PCB), needed advice ? « Reply #1 on: June 02, 2016, 08:04:04 am »

HI. I bought a completed board off Sinko on Ebay, and fitted it up into a detector. It took me ages to work it out, as I was trying to tune it for small gold, when they are instead inherently deep on large iron. The first coil I made for it was rectangular, 30x50cm, 3 rounds of Cat5(8x3wires) end joined orange,orange/white,green,green/white,blue,blue/white,brown,brown/white.( I read somewhere orange-green-brown-blue)
24 rounds joined, but tapped at brown/brown/white junction. The full rounds made 550uH (too high) and with brown/white disconnected it was 420uh (too low). The 23 rounds, with last round still connected open-ended gave me 450uH, and 480uH with the lead. This coil will see my car at 4 metres.
I am thinking the open ended round is acting as a shield of sorts.
Then I made an elliptical coil 30x15cm(approx.) That was 5 rounds end connected, the last 2 open-ended(8x5 less2=38). Again I needed to leave the last 2 connected to get the inductance around 450uH. Coil must be 3 to 5 ohms
For small iron/metal I would try 25cm round, 5 rounds(=40 wires), all joined. Leave the joins exposed so you can try 1 or 2 rounds less also.
This detector is actually designed for large coils (1M-2M square) and large objects.
The description of the control knobs was confusing, and their best settings not clear.

From left to right Noise Signal Sens Gain Tune Thresh Vol

Noise-regulates power to coil. Start at zero if you are unsure of coil resistance. ( mine is set at zero for small gold)
Signal-used for acceptance and rejection of small objects. This is pulse delay (mine is set at zero, least delay, for small gold)
Sens- regulates the ground effect. Start at mid-range.(mine is set at max, which is maximum pulse width for small gold)**This may need to be lowered for small iron objects.
Gain-as high as possible without wavering or being erratic.(around half on mine)
Tune-Used for coarse tuning in Manual mode.(This will need adjusting whenever you change any other settings)
Thresh-Fine tuning in Manual or Auto.
Vol-volume.

If Noise or Gain is set too "hot" auto mode will not be able to balance when you press the auto-tune button (works in Auto mode only).

It's a bit of a bugger to set up, and may not be your best choice for small stuff. But it is an absolute powerhouse for deep objects.

I am quite happy to be corrected here. Any additional information or corrections may help me to further enhance this baby.

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Delta Pulse 2

	Re: Delta Pulse 2S (Turkish one sided PCB), needed advice ? « Reply #2 on: June 02, 2016, 09:34:50 am »

Hi Timc,
Nice detector. wow, so much important information you shared with me, thank you Mr. Timc, you wanna making you detector to be more sensitive to Gold. on the other hand I wanna mine be for Iron. there is a guide to modify DP2 to be sensitive to small pieces of Gold, see the link and download it, Enjoy!

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delta-pulse-metal-detector-practical-guide

So, you don't do any modifications on PCB parts? Right?

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	Re: Delta Pulse 2S (Turkish one sided PCB), needed advice ? « Reply #3 on: June 02, 2016, 03:23:11 pm »

thanks for the link.
very good information

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	Re: Delta Pulse 2S (Turkish one sided PCB), needed advice ? « Reply #4 on: June 02, 2016, 06:52:04 pm »

Thanks Mr.MohKuEng.
My board has not been modified by me. I think Sinko did a good job of setting it originally.
I downloaded your pdf-I intend to fabricate another Sniffer in the future. Perhaps I was wrong saying delay was pot 2, but no matter, as I use it with pots 1 and 2 at zero. My Sinko pcb seems to be quite good on gold from standard. The main modification I would consider would be the pull-down resistor, as it has a very slow response. Perhaps on my homebuilt board I will try to lower pulse delay.
I have a Hantek 20MHz 2 probe oscilloscope coming soon, so when I learn to use it I will be able to experiment more.
My current projects are the Silverdog Baracuda, Newhobby Magnum (clone), and repairing a Compass 94b I bought off Ebay.
My near-future list to do is Arado 120B clone, Sascho TR 2 box, Sascho mini, Sascho IB, MytyMite, Falcon MD20, Tesoro Diablo, 17kHz Italian LX756. etc., etc.,etc...
On a side-note Cat5 network cable is recommended by Sinko for the Sniffer 1x1m coil(one round/8wires). I saw a(small-ish)fast coil(can't remember which detector) made with it on a Russian website also, and my best coil on my SurfPro is made from 3 rounds,(25cm?) twisted to lower self-capacitance.(30x15 on Sniffer also twisted).

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Delta Pulse 2

	Re: Delta Pulse 2S (Turkish one sided PCB), needed advice ? « Reply #5 on: June 02, 2016, 11:58:07 pm »

Hi Mr. Timc,
You are welcome,
It's ok no matter, I wish you will successful with your long list of projects, good luck.
Electronics is my hobby and I'm beginner.

Posted on: June 02, 2016, 11:29:09 pm

Hi Mr. Nickel_n,
You'r welcome, and we are here for sharing information and helping each other.

Posted on: June 02, 2016, 11:32:39 pm

I'm looking for answers to my questions,

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Delta Pulse 2

	Re: Delta Pulse 2 (Turkish one sided PCB), needed advice ? « Reply #6 on: June 05, 2016, 05:51:29 am »

Hi Friends,
I found a second article about Delta Pulse 2, it's corrected version of first article with more information and it's containing modified part list (page 14 to 16),

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delta pulse metal detector construction part 2

Regards,

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	Re: Delta Pulse 2 (Turkish one sided PCB), needed advice ? « Reply #7 on: June 05, 2016, 03:48:35 pm »

Hello delta coil press for better IIa and a scale, two of them passeth among them.
120mm - 36 turns- wire size 0.40 - 1.9 Ohm
300mm - 20 turns -0.50 wire size - 1.6 Ohm
They are my recommended

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	Re: Delta Pulse 2 (Turkish one sided PCB), needed advice ? « Reply #8 on: June 06, 2016, 11:33:18 am »

Thanks Mr. Yasinski,
I have just enameled copper wire with size (0.4 mm). 120 mm coil is small to me, I found a link contains some coil designs for PI metal detectors, I want to make that with 250 mm diameter.

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http://www.lammertbies.nl/electronics/PI_metal_detector.html

Regards,

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	Re: Delta Pulse 2 (Turkish one sided PCB), needed advice ? « Reply #9 on: June 10, 2016, 03:43:28 am »

hola te paso de 250 mm. Round 22 -wire size 0.40 mm-2.3 Ohm resistance .
pero e recomendado 120 mm por su mayor sensibilidad para la pepita pequeña de oro y 300 mm de buen alcance para una moneda .
Sepan disculpar mi mal Ingles .
Saludos.

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