coils for delta pulse

[aurum]

Coils for SNIFFER.
Hello Jose
I like to build a coil 1 x 1 m and a coil of 1.5 x 1 m with enamelled wire 0.50 mm. (I have actually +- 270 m of 0.50 mm/enamelled wire)
Could you please help me for the number of turns.
Thanks

[kt315]

12. on first schema was noted 16.

[Jose]

Coils for SNIFFER.
Hello Jose
I like to build a coil 1 x 1 m and a coil of 1.5 x 1 m with enamelled wire 0.50 mm. (I have actually +- 270 m of 0.50 mm/enamelled wire)
Could you please help me for the number of turns.
Thanks

Long ago, build a coil of 1X1 m for DP, I do not remember well the number of laps, maybe 12 as KT315 says.
The inductance was about 450 uH.
The ohmic resistance of the coil should be between 2.5 and 3 ohms. If necessary, add a series resistor.
Resistances lower than 2 ohms in the coil, caused instability in my PD.
Try to use unipolar cable for electrical installations.
If you use 0.75 mm unipolar cable, you will not need the series resistance.
I did not build 1.5 x 1.5 m coil. In this case the number of turns must be reduced.
These comments are in agreement with my personal experience, it does not mean that they are correct.
Another thing that improves the stability in the DP, is to adjust the TX frequency, to a multiple of the frequency of the electrical network.
Jose

[aurum]

Hello kt315
6666 Told me that you could help me for the following request:
"I like to build a coil 1 x 1 m and a coil of 1.5 x 1 m with enamelled wire 0.50 mm. (I have actually +- 270 m of 0.50 mm/enamelled wire)
Could you please help me for the number of turns?
Thanks
aurum

[kt315]

take a look ATTENTIONALLY on the schematic and you MUST see - 16 turns. WHY IT IS clear for me and NOT SO CLEAR FOR YOU????



WHY???

[aurum]

It was not clear for me because I had no my glasses.
Seriously, I had seen 16 turns but the thickness of the wire is not specified. 0.50 mm or more?

[kt315]

told 1000s times

[kt315]

[tissaweera]

Hello Goldin
M gave good results:
40x40 cm coil, 24 turns, 0.5 mm conductor diameter. Computer network cable, 8 drivers, 3 laps (8X3 = 24).
Damping resistance of 560 ohm and 2200 ohms in parallel, 1 watt.
Jose

Hi , Should damping resister parallel or series with the coil ?

[Jose]

The resistors are in parallel with the coil.
Initially, place the 560 ohm damping resistance, then add resistances in parallel to decrease the total value, until obtaining the best performance.
It can be tested with different values such as 1500, 1800, 2200, 2500 etc.
In my case, 560 in parallel with 2200, gives a final value of 446 ohms.
This may vary because they depend on many factors.
Jose

[tissaweera]

Thanks Jose,
One thing please. If I use damping resisters with each coil should I keep or remove the 680R resister on the PCB .

[Jose]

You can use resistances in the PCB or in the coil indistinctly, provided that is the appropriate value.
Jose

[tissaweera]

Thanks