Hey brad

I m sorry to say that your test is inconclusive as it is not following some important details expressed in the vid. Maybe you didnt see the whole vid.

First off the windings need to be 3 to 1 as suggested at 12:55 and beyond in the vid. As shown in pic below. In the 3D representation in the vid of the bucking coils, notice the purple windling on the left, which represents what that winding is suppose to look like compared to the right.

Secondly you do not have a capacitor in the circuit to acquire resonance.

And lastly, Im looking at using some decent watt automotive bulbs. In my experience the tiny ones change resistance too much and cause freq drift in circuits like these and offsets in the coil/ cap relationships. Used both kinds in my solid state orbo vids.

Working at the moment. Gunna try some of this tomorrow.

Mags

Sorry. Meant green windings in the 3D as shown further up this page by Chris.

That doesnt mean that it is not another winding on top of the bucking windings in an expanded version, but in this simpler test I believe that is what he is recommending.

Mags

Did a little sim earlier.  It seems no matter which way I configure the transformer and its leads to each winding, they both always are having currents in the opposite direction. This indicates that one winding is always overpowering the other inductively. So some further things to think on would be is the resonance we are looking for happening between the cap and the smaller winding or the larger winding, or, with the windings combined inductivity.

I dont use sim to solidify findings, but I like to get the feel of a circuit to see what might be going on.

Mags

Quote from: Magluvin on March 05, 2017, 01:12:19 AM
Hey brad

I m sorry to say that your test is inconclusive as it is not following some important details expressed in the vid. Maybe you didnt see the whole vid.

As shown in pic below. In the 3D representation in the vid of the bucking coils, notice the purple windling on the left, which represents what that winding is suppose to look like compared to the right.



And lastly, Im looking at using some decent watt automotive bulbs. In my experience the tiny ones change resistance too much and cause freq drift in circuits like these and offsets in the coil/ cap relationships. Used both kinds in my solid state orbo vids.

Working at the moment. Gunna try some of this tomorrow.

Mags

QuoteFirst off the windings need to be 3 to 1 as suggested at 12:55 and beyond in the vid.

I think you will find that the winding ratio is not that important to see the desired effect,as long as there is a marginal difference between the two.

QuoteSecondly you do not have a capacitor in the circuit to acquire resonance.

What point is there to having a capacitor where depicted in the diagram?,as the voltage value and polarity across that capacitor  will be determined by the AC input.
To be of any use,there would have to be a resistor in series-as drawn in on the diagram.

Also-which coil are you trying to bring into resonance?.
Each coil has a different amount of turns,and there for a different inductance value-and so,both have a different resonant frequency-regardless of the turn ratios being divisible--as can be seen by your last post-->no matter what way i hook the two coils together,the current always flows in opposite directions.
This is because one winding has a lower inductance value,and so a lower resistive value.

Dose L1 or L2's current ever exceed that of the input current?.


Brad

Did a quick test on sim for something I was thinking about.

I made a transformer with 4h one side and 12h on the other.

With a 50nf cap I pulsed the thing and let go to see ringing and what freq it rings at as measured in the scope. No guessing. Find the exact freq this way.

With just the 4h winding the ring was at 355.87hz. Seems reasonable
With just the 12h winding it was 118.6hz
With both connected 5.3khz and reverse connection of one winding 10.5khz. 

And that is with a fairly small cap and 4h with 12h of windings.  Now we look at the experiment in the vid with the blue windings on the toroid, we are probably looking at 'way' higher freq going on there. I cant even imagine those windings going into the mh each let alone combined either way.  Im thinking Mhz range at least.

Mags