Very large DD coil

[kt315]

wind round the winding by rope. take a wide one. take cheapest. paper or canvas done. may do several layers (of the rope). then
only wind around sticky scotch lenta, also several layers. after that put at the place and fill the epoxy resin.
you get the coils in air, not saturated by resin.

[Krzychu_]

I know I do not have to, but it seems to me that the resin will give the coil additional stiffness, and the low weight of the coil is not so important. In addition, the resin mixed with the carbon fiber will become slightly conductive and will constitute an electrostatic screen [for the receiving coil only]. If you know a better solutions - hint, if it's not a secret.

[kt315]

first mistake. you do not have to flood coils the epoxy resin.

[Krzychu_]

Today I cut in the plate of the soil under the winding of 5 transmitting coils, which will flood the epoxy resin

[Krzychu_]

Has anyone tried to use a program (eg ANSYS (?)) that allows you to easily simulate and estimate the location of TX transmit coils relative to the RX receiving coil depending on their geometry, the number of coils wound and currents and induced voltages to achieve induction balance in the real system?

Regards

[Krzychu_]

I have already collected all the necessary materials: enamelled winding wire, extruded polystyrene foam, carbon fiber, graphite, epoxy resin with hardener, shielded cables, plugs, DC-DC converters and a router to cut grooves on the coil winding.

[waltr]

Carbon fiber sheets or cloth sound interesting.

Please post on how well it works.

[Krzychu_]

It is not a 3 mm rigid sheet, but a very thin fabric or roving

[Koala]

Funny you should mention carbon fibre. I measured some 3mm sheet. Two points 6" apart measure a dead short 0 ohms. Should be able to bolt directly to the surface after the sanding through the surface. As far as I know carbon sheet not been tried.

Cloth has and a reliable method of attaching it to the cable wasn't found

[Krzychu_]

I was thinking about monolithic shielding of the receiving coil, but I have to ask. - Has anyone tried to shield the coil with eg a carbon fiber fabric?

Regards

[Krzychu_]

I already have 7805 as a temporary solution. Ultimately, it will be a DC-DC converter

[kt315]

first mistake. you do a reostat. better way to use impulse

https://www.ebay.com/itm/1A-6-5-40V-to-5V-DC-DC-Converter-Buck-Module-replace-TO-220-L7805-LM7805-LDO-IC/272451377177?hash=item3f6f5e1819:g:QFYAAOSwKOJYK~P0

[Krzychu_]

OK. I decided to solve the problem the easiest way. The stabilizer is in the socket, so I check if the detector will work properly after replacing it with standard 1A, eg LM7805. which has worse parameters: higher quiescent current and higher input voltage from LP2951 to work.

[Krzychu_]

If, however, the stabilizer's performance was insufficient, can I increase it in a simple way, is it not right and it can cause some problems?



Regards

[Krzychu_]

I do not care about super sensitivity. The detector will be used for relatively large objects lying at a small depth. I am looking for and asking a lot of questions not to commit some stupid mistake, but I am most interested in specific, the simplest suggested solutions (eg "I would do it like this ..."), which will have a chance to work with DFX without advanced modifications.