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TOROID T1 T2

Posted: 17 Apr 2022, 10:25
by Luca66
Hello everyone, I can't figure out how many turns the T1 and T2 toroids have. Anyone have a photo? Thanks

Re: TOROID T1 T2

Posted: 17 Apr 2022, 12:50
by Ohwenzelph
Both 7+1

Re: TOROID T1 T2

Posted: 18 Apr 2022, 11:21
by Luca66
Thanks for reply. I wanted to ask for confirmation, with toroids better to be safe.

Re: TOROID T1 T2

Posted: 18 Apr 2022, 13:47
by Ohwenzelph
T2
Most use the same wire for both the seven turns and the one turn.
08C0B68B-B341-4A32-A22D-3D03BC4984E9.jpeg
08C0B68B-B341-4A32-A22D-3D03BC4984E9.jpeg (112.39 KiB) Viewed 2658 times

Re: TOROID T1 T2

Posted: 19 Apr 2022, 17:34
by Luca66
Thanks so much! A picture better than a thousand words.
Did you further isolate the single coil?

Re: TOROID T1 T2

Posted: 19 Apr 2022, 19:31
by Ohwenzelph
I’m not sure what you mean by further isolate. The one turn winding and the 7 turn winding are separate. The single turn goes straight thru, perpendicular to the plane of the toroid. The seven turns start and end in the two holes that are more diagonal. Manuel did a video on constructing the kit that’s good, if you have not seen it then watch it a few times and it will help.
https://youtu.be/VVGBapoCUls

Re: TOROID T1 T2

Posted: 19 Apr 2022, 19:54
by va3rr
Perhaps he's asking about extra insulation on the single turn?

I wanted to add that the 7 turns should be wound counterclockwise, at least according to what I've read on the Kits and Parts website.

https://www.kitsandparts.com/howtowindt ... utpain.php

Here's a colour photo of T2, although it's not as sharp as your photo, and my turns are a bit more sloppy. I used teflon wire for the single turn.

Image

Re: TOROID T1 T2

Posted: 20 Apr 2022, 10:45
by Luca66
Exactly what I meant to ask. Thanks. But is it essential to insulate with a sheath? What advantage?

Re: TOROID T1 T2

Posted: 20 Apr 2022, 11:47
by va3rr
You can use magnet wire for the single turn, as well. Some prefer different colours for transformer primary and secondary in case troubleshooting is required...

Re: TOROID T1 T2

Posted: 20 Apr 2022, 23:23
by Luca66
I confirm that the 7 coils must be wound counterclockwise. Otherwise the single coil would cross with the terminals of the seven coils. All the other toroids I wrapped them clockwise.

Re: TOROID T1 T2

Posted: 21 Apr 2022, 02:48
by Lukekg5wjz
Awww fiddle sticks. Is this critical? Just finished assembly today, but saw this post and realized the primary and secondary windings overlap on mine. Am I doomed to purchase new magnet wire?

Re: TOROID T1 T2

Posted: 21 Apr 2022, 06:35
by Luca66
I have no knowledge to say whether this can be critical or not. We would like some clarification from experts. In Manuel's video, it is not clear how he made the windings, but in the photos put in this thread the counterclockwise direction is very clear.

From above mentioned link, see pictures
Compress_20220421_190635_5873.jpg
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Re: TOROID T1 T2

Posted: 21 Apr 2022, 22:38
by Lukekg5wjz
Well it powered on with 5v at least. No puffs of smoke. Minor victory, but victory nonetheless. Waiting on some adapters/dummy load to arrive so I can see what happens on transmit.

Re: TOROID T1 T2

Posted: 21 Apr 2022, 23:48
by John
The 2 gray transformer toroids need to be wound in the direction such that the 7 turn leads will essentially drop straight down to the proper holes.

That was the only part of Manuel's video I found unclear. As I recall, that part was done with his hand just slightly blocking the coils and the toroids slightly out of the camera's image frame. There was also a small jump in the video at precisely the most important part, and the fact that proper winding directionality was essential wasn't made clear enough for it to sink in to my old brain. I just figured the ends of the wires had to go in the right holes on the PCB's.

I know this particular part well because it was the only part of the build that I did wrong. I twice wound one of the transformers in the wrong direction. The first time I had enough extra wire that I just extended the leads around the outside of the coil to the proper holes and gave it a try in-circuit. No luck. The power meter read zero even though my external Watt meter read 4 watts. So I carefully rewound it and managed to do it wrong a second time! (I find it surprisingly confusing to picture it properly in my mind. I blame it on old age.) But this time I knew to just unwind and rewind again, instead of soldering it in place. That 3rd time I managed to wind it properly, and the power reading on the little rig's display then worked just fine. So when you wind those 2 transformer coils the 7 turn windings NEED to drop pretty much straight down to the proper holes. If they do, then you've done it correctly. If they have to be stretched around the outside of the toroid or cross through the center of the toroid under the 1 turn winding, they're wound in the wrong direction.

Re: TOROID T1 T2

Posted: 22 Apr 2022, 14:26
by Lukekg5wjz
Thanks for the verification. Guess I'm re-winding toroids later. :D