I'm using copper, with the same kind of core material as you, but i'm about ready to start on my new vic.
Don said the core Stan used looked like hard ferrite, so since he used between 0 and 10 khz that would mean he was most likely using a Manganese Zinc ferrite, having permeability’s above 1000.
Anyway, right now i'm getting an ac signal at resonance with 1000 volts across the cell. If I move out of resonance to a different frequency range I read a pulsing signal that switches between 0 volts and around 200 volts. I want to look into this further.
what kind of voltage are you getting with your vic?
here is a picture of my cores and bobbins
Isn't hard ferrite used for permanent magnets? If that core was a magnet it would be useless for pulse signals or not?
Soft ferrite: "The low coercivity means the material's magnetization can easily reverse direction without dissipating much energy"
Hard ferrite: "high coercivity and high remanence after magnetization"
http://en.wikipedia.org/wiki/Ferrite_%28magnet%29
Br,
Webmug
Webmug,
Using a magnet for core is possible.
Only if your coils are producing a greater magneticfield then the magnet.
That way you will notice a change in the magnetic field and my theory is that that also is doing something.
For Meyer cores, i would suggest to stay at cores that fits the frequency, raise and fall times.
Steve
Stan talks about a pulse transformer for the VIC transformer.
What is a pulse transformer?
"The magnetic flux in a typical A.C. transformer core alternates between positive and negative values. The magnetic flux in the typical pulse transformer does not. The typical pulse transformer operates in an “unipolar” mode ( flux density may meet but does not cross zero ).
A fixed D.C. current could be used to create a biasing D.C. magnetic field in the transformer core, thereby forcing the field to cross over the zero line. Pulse transformers usually (not always) operate at high frequency necessitating use of low loss cores (usually ferrites)."
http://www.butlerwinding.com/store.asp?pid=28355What about the VIC circuit, does it do D.C. biasing to make it a pulse transformer?
Does a flat transformer core use less biasing D.C. magnetic field?
Could it be that a hard ferrite core operates in an “unipolar” mode?
Br,
Webmug