The Master Of Magnetics "Steven Mark"

[kames]

Hi Jason,

good to hear you again. About you simple test It seems to me that you are just extracting the fundamental resonating frequency of your coil....that of course is a sinusoidal wave. Remember that a square wave is always composed by the the sum of all possible harmonics.....or am I wrong?

Anyway hope to hear you on Skype.

Ciao
Roberto

Hi Roberto,

Going by the book you are 100% right. However, a lot of things depend on from which prospective one looks at it.
For example, when changing duty and frequency the high frequency harmonics amplitude for a given frequency should vary substantially. If what we see in the Jason?s video doesn?t change much the amplitude of that sine wave, the things are somewhat different than just a level of harmonics in the base signal.

Kames.

[nong]

Hello Jason,

Blocking youtube here.  can not see your vedio.

Pls post your pic or movie files, if possible.

Thank you.

nong,   

[dutchy1966]

In this simple test, I took a spool of 14 gauge stranded house wire about 50ft in length, and I attached the positive lead from a function generator on one end, and the scope probe on the other end. Both ground cables were left disconnected from the spool VERY important!!

Next I just set the output of the function generator to the square wave output (50% duty cycle, 0 DC offset), and I gradually swept through the frequency range from about 500 kHz up to 5 MHz. What I saw was simply amazing!! the small square waves I was putting in (20V pk/pk) multiplied up to 160V when I hit the resonant frequency of the coil! AND the output was sinusoidal!

God Bless,
Jason O

Hi Jason,

I'd like to ask you something about this test you've done based on the following statement from SM when he is talking about kicks:

We are just talking about a straight piece of wire, some electrons and a method of measuring what comes out of it.

So my question is, instead of doing your test with a spool of wire, have you tried the same thing on a straight piece of wire. Maybe if you unwind the spool (and lay it aropund the room  )
Because SM speaks about a straight piece of wire, one would expect to see the same thing then. It would proof once and for all if these are the kicks he means. As a side effect you're also proofing it is not the coil itself that is somehow producing the kicks (harmonics or whatever it is).

Looking forward to your reply!

Robert

[Thaelin]

   I can help out here. This test is the same we do at work tho just a shorter wire. It measures the time it takes for the signal to reach the end of the test wire and back to the beginning. Our test calculates the trace size and thickness, here it is related to the size of the wire. Still the same. A coil will have impedence at a certain frequency where a straight wire will not. The specific test would need to be done to the actual coil or wire in its end state to be exact to what you need.
   The coil here simply shows just how much higher the pent up voltage rises at a certain frequency. When you have the wire to the "exact" frequency length, you will have no bunch up. Get that off just a bit and you have a mess running around in the wire. Back that off to one quarter of the frequency and I think you would have the worst case situation. That being when the full negative side of the wave hits a spot, it also runs into the reflection at 180 degrees out of phase (jason help me out here). Playing with this on a piece of graph paper.

   Next a coil of wire to see.

sugra

[Jdo300]

Hello Everyone,

Thanks for all the great feedback on my post. I will definitely respond to all your comments within a day or so. I have been playing catchup for the last day or so and haven't had the opportunity to sit down and catch up on everything.

God Bless,
Jason O