Aquasound

[dbanner]

Yes, Im agree with You.

Thanks for your keen observation, I don't think I could have figured it out from those photos.

Now I feel confident I can replicate the original coil.

I think all parts of the puzzle are now in place for a successful project. Now I will compile a project file with all the info, parts list, schematic layout, hardware, coil data etc., etc.

[dbanner]

The Nautilus dmc2bA had an automatic feedback tuning circuit instead of those pesky multi turn feedback pots. It was in the form of an add-on PCB to the dmc2b. I wish I knew the circuit for that upgrade.

[kt315]

thats wert9 wrote me with the pics he sent.

срочно нужно оживить катушку от Наутилуса, там на схеме вроде был нарисован блок встроенный в катушку. Он там сложный оказался, 2 транзистора 4 емкости и покрайней мере 3 резистора, так вот проблема терь с номиналом емкостей, никак маркеровку понять не могу((((((((

На схеме не указаны транзисторы, они 2n5088. Схема на наутилус без ручной балансировки катушки, у меня с ручной, так что номиналы резюков и кандеров отличаются.

Замерил диаметр проводов в катухе и сопротивление:

ТХ и СХ имеют по 4.2 Ом, толщина провода 0.45мм - одна пара хвостов соединена вместе и кинута на землю, вторая пара на платку в параллель им пленочный кандер неизвестного номинала ( не выпаивал его из воска, так и остался в обойме)
РХ имеет сопротивление 26 Ом толщина 0.3 мм, в параллель РХ стоит кандер 22Н.

TX and CX are 4.2 Ohm each, wire thickness 0.45 mm - one pair of tails connected together and thrown to the ground, the second pair on the (preamp) board, in parallel to them with a film cap of an unknown value (did not solder it from the wax, and remained in the cage)
The PX has a resistance of 26 Ohms with a thickness of 0.3 mm; in parallel with the PX there is a 22nF cap.

Корпус катушки изнутри промазан графитом (напыление), и обе половинки корпуса.

[dbanner]

Yes but his description of the coil is incomplete.
He fails to recognize that it is a bifilar coil design. He makes no mention of the feedback coils and how they are connected.

Later I will post a detailed diagram of the coil.

[kt315]

Sven had gave right direction. look Nautilus patent. US4099116. you will find the coil data in it.

[dbanner]

This is the Nautilus coil. The number of turns can vary according to the size(diameter) of coil, but this is how it is wound in the bifilar configuration.

[kt315]

yes, Nautilus. but we say about Aquasound coil. it has additional 2 windings to what you draw.
that gives voltage amplitude increasing, if you know electronics good. principle of fishing rod.
on the ends of coil connected a cap (voltage resonance). this way gives 60...100V TX amplitude.

and you must see/notice here MAIN advantage of Aquapulse vs standart VLF.

[dbanner]

Just tying up a few loose ends.Some more observations, paying particular attention to the TX circuit and coil.Firstly, the pnp transistor which drives the coil is mislabeled on the aquasound schematic, it should be 2N2907.Secondly, and this is important, the tx oscillator will NEVER oscillate the way the coil is shown connected in the schematic. It should be connected at both ends of the TX coils and NOT at the point of the feedback coils. I will draw the corrected scheme and post later.

[Altair]

This is the Nautilus coil. The number of turns can vary according to the size(diameter) of coil, but this is how it is wound in the bifilar configuration.

I think the coil is made like on this draw:

[dbanner]

I think the coil is made like on this draw:
[ATTACH]50110[/ATTACH]

Hmmm, interesting.

I base my drawing on Fisher 1260 coil guidance.

[dbanner]

I think both your drawing and mine are electrically the same.
Yours is better because it is less confusing.
My drawing gets me dizzy when I look at it.

[kt315]

I think the coil is made like on this draw:
[ATTACH]50110[/ATTACH]

look on schematic. you have to see what you do not want to see.

[dbanner]

look on schematic. you have to see what you do not want to see.

The coil will not oscillate the way it is drawn on the schematic. I tried in ltspice. I will put the file.

[dbanner]

I think the coil is made like on this draw:
[ATTACH]50110[/ATTACH]

After pondering some more on your diagram of the coil, I think you arrangement is absolutely correct.

When the first tx coil is energised, the expanding flux excites the second coil( because they are wound bifilar), this doubles the energy transmitted by the coil. In other words, the second bifilar tx winding aides the first(mutual inductance).

In my drawing, although I followed the Fisher 1260 diagram, with first tx excited, the other bifilar winding is energised, but in opposite direction, so it opposes the flux field. Intuitively, this subtracts from the total energy of the coil. Not what you want.

So in the end, I think you got it right.

I think I will build your coil and just the tx circuit on breadboard, and check to see if kt315 has a point.

[dbanner]

I'll be able to check both ways by simply changing the connections.