awg34 vs awg28

[green]

Including a picture of the coil I've been working on before potting and shielding. Rx 2(8in diameter round) Tx (oval). Coil wound with awg28 magnet wire. I have some awg34 magnet wire and wonder if the awg34 would allow sampling sooner with my PI. Would need to twist 5 strands together before winding for the oval Tx. Thinking twisting 2 or 3 strands for the Rx coils. Takes awhile to make a coil so am asking if the awg34 would be worth trying and how many strands for the Rx should I try?

[homefire]

Why are you using such small gauge wire for a PI coil ? 20 22 24 26 would be better I would think..

5 strands would get you in the park for resistance. No need to twist it.

https://www.cirris.com/learning-cent...lculator-table

[green]

Why are you using such small gauge wire for a PI coil ? 20 22 24 26 would be better I would think..

5 strands would get you in the park for resistance. No need to twist it.

https://www.cirris.com/learning-cent...lculator-table

I purchased a large spool of awg28 magnet wire long time ago. Seems to be a good choice with 1 amp peak current. Would require a lower resistance Tx coil if I increased peak current to 2amps with my circuit. The larger diameter wire should show as a target and require a longer delay time, the reason I'm thinking of trying awg34 to see if I could shorten the delay time. I was thinking it would be easier wind the flat basket coil if the strands were twisted. Might try without twisting.

[homefire]

This one is going to be a fine sniper coil for the MiniPulsePlus.

5 inch form
2 stands 24 SWG copper
12 Turns
410uH
1.4 Ohms

[green]

This one is going to be a fine sniper coil for the MiniPulsePlus.

5 inch form
2 stands 24 SWG copper
12 Turns
410uH
1.4 Ohms
[ATTACH]40115[/ATTACH]
[ATTACH]40114[/ATTACH]

Trying to understand how you get 410uH on a 5 inch form with 12 turns.

[homefire]

Error: 24 turns. Forgot to count the inside windings.

[green]

Error: 24 turns. Forgot to count the inside windings.

5inch radius or 5inch diameter?

[homefire]

Form is a Knitting Loom loom Five inches Diameter. OS D to OSD Sorry about the Confusions.

https://www.walmart.com/ip/Boye-Loom...BJ1AM_uqkI8zl4

[green]

Form is a Knitting Loom loom Five inches Diameter. OS D to OSD Sorry about the Confusions.

https://www.walmart.com/ip/Boye-Loom...BJ1AM_uqkI8zl4


[ATTACH]40119[/ATTACH]

[ATTACH]40120[/ATTACH]

I made a vertical basket coil while back, not quite the same as yours. 8inch diameter, 23T, 253uH. I was thinking if your coil diameter was 10inches instead of 5inches, 410uH would make more sense with 24T. I'm still missing something or doing something wrong with my coil measurements.

[bbsailor]

I made a vertical basket coil while back, not quite the same as yours. 8inch diameter, 23T, 253uH. I was thinking if your coil diameter was 10inches instead of 5inches, 410uH would make more sense with 24T. I'm still missing something or doing something wrong with my coil measurements.

Green,

The rule of thumb for coil shape is this.
1. Tighter coil bundles with the wire closer together produces a higher inductance coil.
2. Vertical/horizontal coils with layers only next to another turn on each side will have a lower inductance than bundled coil shapes in 1 above.
3. Coils with a lower dielectric insulation material or thicker insulation or coils wound in a weave fashion with turns not parallel with turns on either side of them will have a lower inductance but have a higher self resonance to allow earlier sampling due to less coil self capacitance between coil winds.

I hope this helps?

Joseph J. Rogowski

[homefire]

I think the reason for the higher Inductance is the size of the coil.

Coil 2

22 AWG Aluminum

7" outside

6.25 inside

1.4 Ohms

340uH