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Registered Member #2018
Joined: Tue Mar 10 2009, 09:56AM
Location: Switzerland
Posts: 74
Many thanks for this friendly welcome! i like this forum
@Kizmo: Thank you! Yes, you're right, the oscillator is just a fixed frequency circuit with a TL494.
@rp181: thanks Unfortunately i have to admit, that i'm not able to build nice cases, so i normally don't build cases for my hv-circuits.
@uzzors and teslacoolguy: Thank you very much for the nice welcome
@aonomus: Yes, indeed, both resonators are running 180° out of phase. But in fact, the behaviour of the resonators is bit strange. They seem to influence each other. The spark-length would be greater if i just would drive one resonator with the same input power. I don't know why. Since i removed the GND from the secondaries and just tied them together, it works better, but still the performance seems to be not as good as with just one resonator at the same power.
Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
It's interesting that you had to raise the primary coil for the resonator on the right by a centimeter or so. Presumably the system is quite sensitive to changes in coupling if this made a difference!
You might find that putting little metal rods or foil bumps on the two toroids to act as breakout points improves performance of the twin coil.
Are your two primary coils connected in series or in parallel? I once did an analysis of this and seem to remember that the behaviour of a twin would be quite different with these two methods of connection. Can't remember which one would work best though!
Registered Member #2018
Joined: Tue Mar 10 2009, 09:56AM
Location: Switzerland
Posts: 74
Hello Richie
Thank you very much for your information.
It's interesting that you had to raise the primary coil for the resonator on the right by a centimeter or so. Presumably the system is quite sensitive to changes in coupling if this made a difference!
Well noticed The primary right is a bit higher placed indeed. This is due to the fact, that the resonance frequencies of both resonators are not exactly the same. By changing the coupling, there are not the same amount of windings of the secondary "activated", so the resonance-frequency can also be changed slightly for becoming excatly the same value.
You might find that putting little metal rods or foil bumps on the two toroids to act as breakout points improves performance of the twin coil.
In fact, there are break-out-points on the toploads, but these can't be seen very good.
Are your two primary coils connected in series or in parallel? I once did an analysis of this and seem to remember that the behaviour of a twin would be quite different with these two methods of connection. Can't remember which one would work best though!
Both primaries are driven separated from each other with separate half-bridges. In an earlier setup i had both primaries serial connected, but this didn't work very well in my case (but mainly due to other problems i had, for example there were other secondaries with too high resonance frequencies, and this killed the bridge). After the shoot-through, i decided to build a completely new design with two separated halfbridges. These can also be connected to one fullbridge for driving just one coil with double power.
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Twin-SSTC
