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Hi everyone,
i would like to share my coil building process which result to a very light coil.
For this, i used 3mm foam, a small piece of 10mm foam or plastic for the fixing harms.
So, the fist step is to draw 3 circles on the foam (2 of the same size and one 10mm les in outer diameter an 10mm mor in inner diameter).
Then, you have to cut the three circles
You can now cut 37 notchs on the inner circle and 37 on the outer (to calculate the space between 2 marks : d=(3.14148Xdiameter)/37
Now, it's time to wind the coil. My first one was bad cause i did not find any explanation on this. I'll to explain it in english : if you wind all the turns in the same way, you won't have the same result as expected. When you finish a turn (i mean, just before your wire goes into your first mark), you have to shift the winding of one mark.
When the winding is done, you should have 6 layers in each notch.
You are now ready for the assembly. You'l need epoxy glue, plastic screws, coaxial wire, jointing compound and for the finish, epoxy paint and spray black paint.
I first make the top layer, assemble and solder the cable
Then, i glued the three parts together :
Now, it's time for the jointing work. I use aeronautical compound use in planes fuel tanks but you can put watever you want (just carefull of the painting capability).
In order to make my coil lighter, i use just a small layer of compound by putting a foam stripe all around the exterior and the interior (the exterior one have to be glued in place.
The finishing of my coil consist of 5 layers of epoxy paint (aeronautical paint of course)
and, to finish, black spray paint
Her is the whole detector :
My coil has an exterior diameter of 23cm, 1.1ohm and 318µH.
The delay is short int clone menu (about 5 to 8µs).
Regards
i would like to share my coil building process which result to a very light coil.
For this, i used 3mm foam, a small piece of 10mm foam or plastic for the fixing harms.
So, the fist step is to draw 3 circles on the foam (2 of the same size and one 10mm les in outer diameter an 10mm mor in inner diameter).
Then, you have to cut the three circles
You can now cut 37 notchs on the inner circle and 37 on the outer (to calculate the space between 2 marks : d=(3.14148Xdiameter)/37
Now, it's time to wind the coil. My first one was bad cause i did not find any explanation on this. I'll to explain it in english : if you wind all the turns in the same way, you won't have the same result as expected. When you finish a turn (i mean, just before your wire goes into your first mark), you have to shift the winding of one mark.
When the winding is done, you should have 6 layers in each notch.
You are now ready for the assembly. You'l need epoxy glue, plastic screws, coaxial wire, jointing compound and for the finish, epoxy paint and spray black paint.
I first make the top layer, assemble and solder the cable
Then, i glued the three parts together :
Now, it's time for the jointing work. I use aeronautical compound use in planes fuel tanks but you can put watever you want (just carefull of the painting capability).
In order to make my coil lighter, i use just a small layer of compound by putting a foam stripe all around the exterior and the interior (the exterior one have to be glued in place.
The finishing of my coil consist of 5 layers of epoxy paint (aeronautical paint of course)
and, to finish, black spray paint
Her is the whole detector :
My coil has an exterior diameter of 23cm, 1.1ohm and 318µH.
The delay is short int clone menu (about 5 to 8µs).
Regards
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