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[Freddy67]

DD is normally VLF. Pi has only one winding.

[jap]

H i TheBreMar
What the name of metal detector ?
-if coil DD type. a percentage large of a VLF!!!!
best time
j.

[TheBreMar]

Maybe i'm wrong but is it possible that I have a PI metal detector coil instead of VLF? As I said before, resistance of both coils are almost the same, around 6 ohms... Coil is DD type.

[TheBreMar]

Is there any type of metal detector that uses coils which have the same resistance and inductance (Rx and Tx)? And their resistance goes from 5 to 8 ohms?

[jap]

Hi Freddy67
Be sure to wire diameters exactly - smaller diameter increased resistance and vice versa.
best time
j.

[Freddy67]

Hi Jap

Thank you for this answer .
I will remove the thread on TX for me approaching 2.1 ohms.

Best time

[jap]

Hi Freddy67
- coil is 0.9mH;2,1ohms/14,72mH;30,6ohms.
-RH coil is 0.9mH;3,9ohms/15,83mH;40,6ohms.
your 7.5 ohms for TX very rong --- 31.3 ohms for RX,true
best time
j.

[Freddy67]

I think you have the same problem as me. There may be a way to change the values by putting resistors in series and changing the value of the capacitors. I'm a beginner too.

Greetings

[TheBreMar]

Thank you Freddy67 for quick reply This coil I have is not made by me or anybody I can contact with, this coil is also sealed in plastic so I can't make any changes. I'll try to make coil for "ceaser" electronic, maybe is not the best option but I'm only a beginner Cheers!

[Freddy67]

For Jap

In post 254, the resistances are 7.5 and 30.6 ohms. As I'm over these values should I remove turns of wire unless I can catch up by changing the values of the capacitors but I do not know how to calculate these values, and I do not have L meter

[Freddy67]

Hi TheBreMar

In post 254 we see that the resistance are 2.1 and 30.6 ohms. So there must be a problem with the number of turns somewhere.

[TheBreMar]

Hi everyone! Is it normal that my so called universal 2D VLF coil has on Rx side resistance of just 7 ohms??? Resistance of Tx side is 5 ohms and I think that that is ok but what about Rx? Also, when it's powered up there is no voltage at Rx coil. My coil have a 5-pin connector and I have tested all possible combinations between pins and beside 7 and 5 ohms all I get is infinity resistance... Is my coil broken???

[jap]

Hi Freddy67
Fine tuning
Data DD coil 28cm is:
TX - 75 coils, wire of 0.45 mm-----you 60 TU xxxx
RX - 160 coils, wire of 0.27 mm
- use a L-meter . and Use one of the methods to set the two coils over some for where coils Position(Adjust the balance).
best time
j.

[Freddy67]

Resistance 7.5 ohms for TX and 31.3 ohms for RX.
Is this about right and what are the caps for these values (I'm not very good for this kind of calculations ).
I do not have a device to check the inductances.

[Freddy67]

Hi Jap

Thank you for the answer.
I made 2 D 255 x 137 m / m, 160 turns of 0.25 and 60 of 0.45. So everything would be okay at this level. I'll check resistances and impedances this afternoon.

Greetings