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Registered Member #2899
Joined: Wed Jun 02 2010, 06:31PM
Location: Deinze, Belgium
Posts: 255
I know the value of the capacitor and off the coil. The coil has 16 turns, the capacitor is 7.8 nF. The coil works but I think it can be better. Is fine-tuning necessary? And how do you do that? Is half a turn of influence on the results? If the answer is yes, I must unwind the coil a bit and it is such a nice coil...
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Hi, you should always put tuning taps on the primary of a VTTC, at least on the upper part of it. Single turn tap changes usually make a difference. Your cap seems a bit big to me, you might have better luck with something like 2-4nF and more turns - assuming the coil runs on a non-doubled MOT. Note: The VTTC tank circuit usually seems to run the best well below calculated unloaded secondary resonance, maybe something like 60-70% of sec. resonance.
Registered Member #3806
Joined: Sat Apr 02 2011, 09:20PM
Location: France
Posts: 259
Dr. Dark Current wrote ... Hi, ... Note: The VTTC tank circuit usually seems to run the best well below calculated unloaded secondary resonance, maybe something like 60-70% of sec. resonance.
Why unloaded ? Isn't it because when you add a topload to the secondary, this will lower its resenance freq. thus matching the 60-70% calculated primary fres ?
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Tesla coil with 811a tuning
