Armagdn03 wrote:
Thank you Eric for your encouragement.
Right now, I believe its current embodiment is not all it could be. For example, placement of the top load changes the frequency of the resonant structure by about 10 %, which is pretty bad. This means that the rest of the resonant action in the capacitive end of the spectrum is happening within the coil and running a neon along the length of it will verify this. In order take it to the next level, one would need to have an inductor with spaced windings leaving as much of the capacitance as possible within the topload. This also will increase the Q of the circuit, as you are removing un wanted parasitic capacitance.
In order to get a good inductor one would need a large-ish diameter coil with spacing for the windings. If anybody has a lathe that could turn some PVC with a helical grove for windings, I would be really grateful to see if something like this could be made.
I have been thinking about how to replicate the coils used by DrStiffler.
In a lathe you make a cylinder to wind the coil on, and with centering holes both ends.
Then you go to the milling machine and make 4 axial "tracks" (i guess I need the right word here) the same size as the 4 plastic strips fixating the coil.
In addition you extend with other "tracks" so you can fit in a square rod with non-parallel sides. Using screws to tighten the rod, it can be used to hold tight the plastic strip for fixating the coil. The plastic strips are "buried" about 2/3 in the cylinder.
Having done that for all 4 strips, you go back to the lathe.
Here you use a cutting tool with a width a little less than the wire diameter for the coil.
Setting the lathe for making threads with the right advance per revolution, you can now make the slices in the 4 fixed strips, just like you were making a thread.
Then you wind the coil in the thread slices, the coil stays put because of the tight tolerance in the slices.
By pre-adding 4 thin removable plastic sheets next to the strips, it should be possible to remove the coil from the cylinder. Need I say the fixating rods must be longer than the coil for access to loosen the screws.
I have a friend with a machine shop, so when I have finished my SW I have considered to make my own coils.
Using this method, you can make the coils exactly as needed.
When I was young I worked several years in a machine shop, and with a bit of refinement to the above idea, especially the removal of the coil, I consider this doable.
Maybe you have some good suggestions for the coil data ?
There are dissadvantages to taking the capacitive route, mainly that the capacitive end of the spectrum interacts heavily with biological systems, and hence biological systems being primarily water, act as a load to the transmitter. This means that you the inventor can detune the system, and dissipate some of its energy in you!
I can confirm this. I had some success having a nice output, unfortunately I did not feel well for a week. The key to avoid this is to have one or more resonant and loaded receivers so they collect the energy better than your "sphere" head.
It would pay to try and accomplish the same transformer action via inductors, similar to what was displayed by MIT with their wireless transfer device several years ago.
Do you have a link for that ?
Eric
