TGSL 100x100mm build questions

[yatahaze323]

Yatahaze pay attention to the transistors pins! I think that you have misplaced the Jfet J107 it's not BF245, it wont work that way!

I was looking at the Datasheets for the J107 and the BF245 and it appears that they have the same pinouts. I'm assuming that since they have the same pinouts for the Gate Source and Drain pins that they are in the correct orientation. I was also assuming that since the BOM in the TGSL sticky post doesn't list the BF245 that the J107 was supposed to be used as its replacement, is that correct? Thanks again!

[Nandor]

I have used J106 and it needed to be changed, the datasheet that I have says that J105 J106 J107 all have the same pinouts maybe your transistor is different.

Ne555 the overlap of your coils is to narrow, very small! Residual Rx voltage should be ~4mV.

[BKY1337]

You need an Isolation between the Coils.

[ne555]

These dimensions of 30 mm overlap the full size of 275 mm in these dimensions with lifting resistance 10K get the maximum depth

[ne555]

[IMG][/IMG]

[ne555]

[IMG][/IMG] tx 8.7mv rx 0 mv

[Nandor]

As BKY1337 said you have to isolate the coils from each other with some isolation tape, just some pieces between the two coils so the wires do not touch each other! It is very important.
Connect the multimeter paralell to the Rx coil in AC mode not DC as you made and check it again so you have ~4mV, move the coils for the optimum result and you will have good sensibility.

[BKY1337]

Yes, Video looks exactly like that.

[kt315]

you must delete foil and use graphite. nobody NODODY HERE suggested you to use the foil
in the coil. Or you are so an oligophrenic boy and you are not able to read the forum?

[blobber]

Well, I use thin selfadhesive alufoil in one direction, not turned around the coil, for all my homemade coils so far. I add also a blancket wire over the foil, before I wound all with thin elastic plastic tape. The results are very well in my opinion. Also Don Bowers suggested it similar in the TGSL DD coil building document.
But hey, so I accept your opinion, to use graphite shielding, but I 'm also a stupid idiot as well.

[ne555]

https://youtu.be/y1b_-1eJGEs. The voltage was adjusted and the insulation of files on some plastic sheet obtained the same result

[ne555]

the 100k disc after coil insulation when made to the last range produces a continuous sound without fading

[ne555]

The problem has not been solved in copper coils have been resistance was shortened It works well now a wonderful depth thanks for all

[chuubaba]

This need comments from gurus

The problem has not been solved in copper coils have been resistance was shortened It works well now a wonderful depth thanks for all

[kt315]

this wire of rx is connected inside coil to ground/shield layer. i see that so.