Resonance Circuits and Resonance Systems

[Belfior]

I checked out the wiki. Those are interesting proposals they show in pics below. Ive only ever seen coil loop to coil loop in transmitting and receiving like TK has shown in his vids. Would there be a difference by having a separate LC next to the receiving coil vs just having the receiving loop as the L of the receiving LC? And then they show a separate LC with the transmit coil also.  Is worth looking at.

The other link is not working for me.

Are you looking to go Tesla for the high voltage aspect?

Mags

TK is the reason I am here wondering The annoying thing here is that my kungfu consists of resistors, caps and some diodes. So I got lotsa ideas, but no skills. It seems electronics is like baking. You need to know the basics to start to experiment, but when I can't find anything like this learning even the basics is hard

I want to try to prim -> LC -> LC -> load, but I got no circuit to drive looped coils. Everything is flyback feedback or for ignition coils.

I just want to get something to show up in my scope like prim & looped secondary in resonance. When I hit resonance I want to add another coil to see if I can still get prim & sec resonating, but also excite the third col. I want to try to "blind" the LC like Tesla did, so it would charge to higher voltages it receives

[Belfior]

I would recommend "backing up" one step and going for the auto-resonating circuits like the Slayer Exciter using your 2n3055 to start with.
(You should also know that not all 2n3055s are created equal, there are many fakes out there that cannot take the HV, so try different manufacturers and sources for your transistors if possible.)

The reason for using auto-resonating circuits is that the actual resonant frequency of the coil set will change due to changing environments like proximity of your hands, other metal objects, supply voltage and so on. So if you are using an oscillator circuit like the 494 you will constantly be retuning to keep the setup in resonance and may miss the true resonant point altogether. Autoresonating circuits are much easier and simpler to work with when you are starting out.

There are many different types of autoresonators. The TKoil X circuit demonstrated above is an antenna-driven E-field feedback circuit but is more complicated (and less safe)  than the direct base-driven Slayer Exciter circuits as shown below. More sophisticated auto-resonating SSTCs use phase-locked loops (CD4046, etc.) to lock into resonance and these can produce great results but are not for the raw beginner.

Good Luck!

This will work with 2n3055:
http://www.youtube.com/watch?v=c6uQUxC7DS8

Thx Tinsel!

Yeah I backed up already. Had a beer and thought this through. Having the circuit "autotune" itself is a major factor. Just wondering how a looped secondary will work with that? I will attach a schematic I'm using and maybe I add a third coil there that is looped with a cap. prim and sec would autotune even with the third coil I think

[Belfior]

TinselKoala I have to say your slayer exciter is a really clean build! I feel a ashamed now My lab is 1m x 1m between a bed and a shelf.

I will try your circuit on my coil.

[Belfior]

is the larger number of turn on the secondary necessary when trying to get HV? I was told in tesla coils the primary "whips" the voltage up the secondary and that is how the voltage builds up.

If the secondary is a looped coil what would introducing a large cap do to the situation? Freq, voltages?

If the secondary is feeding back to the system can I get away with smaller number of turns?

Did one 400 turn coil and using that as my secondary. Took me hours with thin cable Primary is going to be 3 turns

[TinselKoala]

Nothing to be embarrassed about, we all work with what we have and try to make the best of it.

is the larger number of turn on the secondary necessary when trying to get HV? I was told in tesla coils the primary "whips" the voltage up the secondary and that is how the voltage builds up.

Yes, the action of a good 1/4 wave air-core resonator is somewhat like a "whip" in that the top end is free to swing to very high voltage amplitude.
The number of turns on the secondary is related to the frequency of the resonance. You must consider the "electrical length" of the winding, which
influences its inductance, which in turn combined with the top capacity will determine the basic resonant frequency of the setup. Shorter electrical
length means smaller inductance which means higher frequency of resonance. Once you get over about 4 MHz you are well into high frequency radio
transmissions and you will have to have your layout, components and construction all fit for that purpose. For practical experimentation using
ordinary transistors and haphazard layout, you should try to stay below 1 MHz. This means longer coils, more turns, etc.
You can attain VRSWR and high voltages with shorter, higher frequency coils but as I said, you have to be much more careful with your layout and
component choices. You aren't going to get much satisfaction with a 2n2222 transistor and a 4MHz resonator!

If the secondary is a looped coil what would introducing a large cap do to the situation? Freq, voltages?

I'm not sure what you mean by "looped coil" or "large cap" here. You can use any number of on-line calculators to determine resonant frequency,
inductor and capacitor values. My favourite one is here:
http://www.1728.org/resfreq.htm

If the secondary is feeding back to the system can I get away with smaller number of turns?

I'm not sure what you mean by "feeding back" here. The Slayer exciter circuit uses feedback from the base (bottom) of the secondary to drive
the transistor's Base terminal. The TinselKoil X uses antenna feedback from the secondary's E-field to drive the mosfet driver chip. As I said
before the turn count of the secondary, all other things being equal, will determine the basic resonant frequency of the system. The fewer turns,
the lower the inductance and the higher the resonant frequency, again if all other variables are held constant.

Did one 400 turn coil and using that as my secondary. Took me hours with thin cable Primary is going to be 3 turns

Good. It's good practice to wind coils, good discipline, and you'll get better at it the more you do. Masking tape is your friend, use it to
tape down the turns so if you need to stop or if you let go for some reason, your coil will only unwind to the taped part, not totally!

But I have to warn you: You will find it very difficult to get consistent and satisfactory results using a loose, sloppy layout with lots of
clipleads, and the problems will get worse with higher frequencies.


One other thing: When posting pictures to the forum, please PLEASE try to keep the horizontal width small enough so the pix don't run
off the page to the right. 800 pixels wide is good enough for most purposes; rarely you may need to use up to 1024 pixels wide. If you
need to show some detail at high magnification, crop it out of the larger picture and post the cropped detail at no more than 1024 pixels wide.