Great super D coil for IGSL

[piramida]

Hello Everyone
I started creating a super D probe for IGSL.
The dimensions of the probe are the same as the minelab 19 "
I'm not sure how to connect two RX windings to one another. With DD coils, RX is 6.5mH and 19-25 ohm, but in this case there are two TX coils.
If I use a 0.25mm wire, I should make two 13mH and connect in parallel, but then I would have a resistance of 10-12 ohm, or to make two 3.25 mH and batch serial, but then the resistance would be 40-50 ohms.
The circumference of the TX winding is 120 cm
The volume of two RX windings is 90 cm
You might need to change the thickness of the wire.
Do you have any ideas?
Excuse me for bad English

[waltr]

Search for "DOD" coils to find build info.

[MartyJ1963]

@Pyramida,,,http://forum.cxem.net/index.php?/top...0%D0%BE%D0%B2/
Hope these helps you. I made a Super DD coil to try on my Mirage PI Detector but it's no completed yet.Marty

[piramida]

Thank you for your answers
I do not make coil for PI but for VLF!

[Koala]

not sure whats going on but the above reply is in English Thank you for your answers I'm not making a coil for PI than a VLF! but is displayed in sebian? on my computer strange

spoke too soon displays correctly now must have been some cache error on my end.

[MartyJ1963]

@Pyramida,,,,The links and photo's I posted are for building a VLF coil,,,one transmit coil and two receive coils,,,for VLF (Minelab),,,all I was saying was that I built the same coil and wired one of my Mirage PI's to use a balanced coil configuration. One of the diagrams I posted gives you the answer to what you asked,,'How do I wire the RX coils?' - you have to wind them both in a clockwise direction,,,the 'End' wire of the rx coil on the left connects to the 'Start' wire of the RX coil on the right,,,,both coils should be 3.25mh each. Regards,, Marty

[piramida]

Thanks MartyJ1963
I realized what you said
now I need to experiment with the thickness of the wire to get the best Q factor for 14 to 15 KHz
My question is which Q factor is ideal for this frequency?

[MartyJ1963]

Hi Pyramida,,,,If I come across any new information regarding the 'Super DD' I will certainly post it for you,,,I'm still translating a lot of coil/Detector information from Russian at the moment so hopefully there will be some answers for you in there. Best of luck with your coil. Marty

[piramida]

OK
Today I will make windings and test them.
I made some calculations and I think this probe will work fine.
I'm still not sure about the Q factor, but I think Davor said in the forum that it's good> 20
@Marty between the two RX coils there is a capacitor. What's the value?

[Bhathu saaii]

@Pyramida,,,http://forum.cxem.net/index.php?/top...0%D0%BE%D0%B2/
Hope these helps you. I made a Super DD coil to try on my Mirage PI Detector but it's no completed yet.Marty

how many turns for this one dude?for tx and rx..also number of wire? and what is the value of capacitor used here? is it parallel or series? thank you

[Bhathu saaii]

OK
Today I will make windings and test them.
I made some calculations and I think this probe will work fine.
I'm still not sure about the Q factor, but I think Davor said in the forum that it's good> 20
@Marty between the two RX coils there is a capacitor. What's the value?
[ATTACH]45264[/ATTACH]

can we use it on a minelab gpx5000?

[MartyJ1963]

Hiya. If you're making the Super DD coil for the IGSL - Tesoro coil version, then you have to make 2 x rx coils,,,each rx coil is 3.25mh,,,and you make 1 x TX coil at 6.0mh,,,,The capacitor in parallel depends on frequency. You will have to try different values until you have the correct frequency. Regards,,Marty.

[Bhathu saaii]

Hiya. If you're making the Super DD coil for the IGSL - Tesoro coil version, then you have to make 2 x rx coils,,,each rx coil is 3.25mh,,,and you make 1 x TX coil at 6.0mh,,,,The capacitor in parallel depends on frequency. You will have to try different values until you have the correct frequency. Regards,,Marty.

Thank you dude..can i use it with the minelab gpx5000?

[MartyJ1963]

Hiya,,,I read somewhere that a Russian guy made quite a few of these Super DD coils for his Minelab detectors,,,I've been looking for the posts and videos but can't find them. They are on one of the Russian Metal detector forums. Marty

[piramida]

I made two coils of wire that I had at home.
They are wires of 0.25mm and 0.40mm. According to the calculation, there should be 0,30 mm wire for the Q factor, but I did not have it.
The inductances are exactly TX 6mH and RX 2x3.25mH, connected in series.
0,25 TX 6,02mH , 28,3ohms , Q44 2xRX 6,48mH , 37 ohms , Q15,88
0,40 TX 5,97mH , 12,4ohms , Q18,31 2xRX 6,54mH , 16,6 ohms , Q35
Air detection for both types of coil for 1e and silver coin is 40cm.
Then I brought a 12v direct to the oscillator instead of 8v and the detection jumped to 46-50cm !!! Zip lighter at 68-70 cm.
when you are very close to the probe you have 4 sounds and how you get off the number of drops, and in the end only one remains. This is very useful for determining the approximate depth
Coils are not protected and are very messy with long ends of the wire. They are zeroed to 0.04mV. In the room with lots of noise everything works steadily.
Now I need to find a 0.30mm wire and made shielded coils and test again.
Can someone say how much Q factor is best for this detector?
Do you have any idea of testing while I'm still in the detector?