Magnetic Resonance Devices based on Don Smith Concepts

[Paul-R]

If you add a 4 turns collector top hat coil and add a microwave oven cap you have made a tuned circuit

*** microwave oven capacitors ***

Don't forget that they usually have 1 megohm resistor connected across the poles.

[Peterae]

xeno
I'm well chuffed with that meter for the price, it measures caps real accurately, Q and reactance values on the coila as well as ESR for caps.

Capacitance to 0.001 pf
Inductance to 0.001uH
impedance to 0.001Ohm

[lobo]

Hi everybody,

Capanaze talked about "resonator". Audin has also resonator and according to this pictures in attachmen in points "P" and "P'" is maximal current and at the end of the coils "S" and "S'" is maximal voltage wich actually corespondates with mr. Smith!

See ya!

[Peterae]

OK what seems too good to be true is too good to be true LOL
My meter arrived today and wasnt a meter it was a set of crock clips DOH.

So sent them back, and ordered a similar meter from china, same features bit less accuracy .

I have bits arriving on a daily basis at the moment, but still waiting for my diodes and HV wire from china.

Peter

[Yucca]

Peter, lol I thought that price was very cheap especially for farnell, I looked at the link and it looked like the LCR meter, especially as that is what was pictured? but reading again you must have just got the 4pole test clamp.

I´ve been busy with other stuff for a few days but plan to start more experiments with the coils I´ve built so far.

I read a few posts back that your thinking (due to reading smiths writing) that the primary needs frequency matching to the natural resonance of the secondary.

Here´s a nice vid of finding the working resonance of a T coil secondary, you may well have seen this already. The guy even hangs a wire of the top toroid to simulate the extra capacitance caused by extending streamers:

http://www.youtube.com/watch?v=Euy2U92I8e4

Of course I wont need to simulate streamers but I´ll try the same trick of just connecting the coil base to my signal genearator +v and leave the gnd clip unconnected and then stand a free scope probe next to it (which will probably even still skew resonance frequency?). This way I will try and find working (natural) resonance including capacitive, resistive and inductive elements of all secondary components.

I will also check for resonance of just the coil with the bridge disconnected, which I think maybe the true meaning of natural resonance of a coil in strict RF terms with only capacitive element provided by surrounding air, useful for antenna design.

One question is do we check for resonance with all components in working position, including sliding the unpowered primary into position?

It´s too late now to do it but I´ll probably get round to it tomorrow.