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Hi,

I'm back experimenting on the TPU. 

Thanks to all who keep working on it. 

For your enjoyment, I've attached a video clip of a blocking oscillator implemented with a 2 coil wound ferite.  (main and feedback coil)

Take a look and see what a magnet does to it.  Hopefully I'm posting in the right tread

EM

Thank you marco, I'm glad you like it.

I thought about the effects I was observing (frequency shift) and I knew why one was happening but not the other.

What I mean is this.   

1) When the North face of the magnet faces down, the frequency increases significantly.

2) When the South face of the magnet faces down,  the frequency decreases a little bit, and if I approach the magnet any closer then it starts to increase.

I was puzzled by # 2,  why was it happening?   Then I realized the implications.

The missing piece was  the EARTH MAGNETIC FIELD.   It aligns the domains of the ferrite and fewer are involved in flipping with the oscillator.  So when the south pole faces down it cancels the magnetic field of the earth and we get the MOST DOMAINS TO PARTICIPATE.   When we have the most domains, that's when the coil has the highest inductance and hence the lowest frequency.

When the North face is down, then the ferrite alligns its magnetic domains even more and fewer are available.  In scientific terms we SATURATE  the ferrite.  When that happens the coils behave as if they don't even have a ferrite but an air core.  The inductance is small and the frequency high.  (inverse relationship)

Anyway,  its a good way to see that the earth magnetic field has some strength and affects electronics, but we don't notice it always.

EM

Thank you for video file.   

Hi Stefan,
 
The earth magnetic field already saturates the ferites somewhat, when no magnet is present.  Much like a DC current will.  But there is no DC current in the coil.  It's only the earth's magnetic field that biases the ferite.

So the small magnet when it opposes the earth magnetic field, it cancels the flux around the ferite and "simulates" a condition free from magnetic fields.   

In this ideal situation,  the ferrite is close to zero on the B-H curve and we get the most out of it in terms of magnetic domain flipping and the largest inductance.  Neodymium magnets have the same effect albeit more pronounced.  

Basically this is a qualitative experiment to realize the earth's magnetic field does affect circuits, it sets the bias point, but we don't always worry about it, or realy need to worry, I suppose. 

It is quite interesting though.  It took me by surprise as well.  The ferrite has AC in it only (from the coils), but also seems to have static fields from the magnet/earth's magnetic field, which sets the bias point.

EM

Hi EMdevices,
hard to say what is going on, if we don?t know the circuit diagramm you are using...

Maybe you just hit with the ferrite stack better the resonance frequency
of the LC tank excitation and then shift the inductance to be rightregime, so
it gets in better resonance ?

2. In your first video, how was the ferrite core coil on breadboard being used ?
Was there no DC bias current through it ?

Here's a chart to try and explain what I'm thinking.

Note the slope change.  The steeper the higher the inductance.

There is more to it, but in a sense its the bias point that changes.  But it's not excluded other phenomena might be occuring.