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Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
> 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.
That is true that altering the coupling also changes the resonant frequency of the secondary. The tighter the link coupling, the more of the secondary inductance that is tied up in transformer action, and the less of it that is free to resonate with the toroid. As a result the resonant frequency of the secondary increases.
CW SSTCs are also quite sensitive to the coupling though, so it might be better to match the resonant frequencies of the two secondaries by raising/lowering a toroid, or putting a longer breakout rod on one toroid.
It's also interesting that you found the system worked best when the ground was removed from the mid-point connecting the two secondary coils together!
Registered Member #1845
Joined: Fri Dec 05 2008, 05:38AM
Location: California
Posts: 211
It's also interesting that you found the system worked best when the ground was removed from the mid-point connecting the two secondary coils together!
I found that my twin spark gap coils worked just as well (if not better) with NO earth gound connection also. In these "twin systems" I guess its just not neccesary to ground the center of the two secondaries.
Registered Member #1911
Joined: Mon Jan 05 2009, 06:30PM
Location: Salem, Oregon, USA
Posts: 165
SteveC wrote ...
It's also interesting that you found the system worked best when the ground was removed from the mid-point connecting the two secondary coils together!
I found that my twin spark gap coils worked just as well (if not better) with NO earth gound connection also. In these "twin systems" I guess its just not neccesary to ground the center of the two secondaries.
That makes sense when you consider that, with a single-spark gap, double-primary twin SGTC, since the secondaries are 100% out-of-phase, one is 'pushing' while the other is 'pulling'. This makes it so that one is a perfect ground for the other - even better than an Earth ground - and the other is the perfect ground for the first. This is the same for a twin coil with only one active primary - the secondary coils act as a bipolar Tesla coil and work as a normal high-voltage transformer (operating at resonance); one leg of the transformer's secondary connected to the other.
The reason it has better output is for the same reason that you will read a larger voltage on your multimeter when you are connecting a battery to the positive lead of your multimeter then the negative side of the battery to your negative lead when compared to connecting the positive side of your battery to your multimeter and the negative of your multimeter to an earth ground.
Registered Member #2018
Joined: Tue Mar 10 2009, 09:56AM
Location: Switzerland
Posts: 74
What have we been told at technology school? Electronic boards should be powered with a voltage in the range of 5V or 12V? What nonsense! Some boards definitely require high voltage
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Twin-SSTC
