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Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
As far as I figured him out, each cap is 67nF. 15 in string give 4,46nF and two strings give some 8,9nF wich is almost exactly resonant to his transformer. I guess he would want to use a nf or two bigger cap for safety of his NST.
What are you using as a sparkgap now? In most cases poor performance is caused by gap failing to quench properly. Use a fan to blow air across your gap, and make sure it is set *just* far enough for transfoprmer (without primary tank circuit) to arc across it.
Registered Member #586
Joined: Sat Mar 17 2007, 06:51AM
Location:
Posts: 13
Yes, those are ikea toploads :)
My secondary resonant frequency is 299.68KHz according to DeepFriedNeon's javascript calculator. Does the performance of the TC vary alot as you are about to tune to resonance?
My sparkgap is made up of 10 copper tube electrodes bolted to acrylic in a flat planar manner. A ac fan is blowing through all the gaps. Fan and planar array of spark gaps are parallel to each other. However my fan rated for 220v is running at 100v as my xfmr uses 120v. Both are connected to a variac. Will using 2 fans quench about twice as good?
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Tuning your tesla coil to resonance is necessary to get the best output, and depending by how much your're off tune the ouptut can just a fraction of what it would be at resonance. Untuned coils may or may not give streamers, as it depends on how far off tune you are.
Given the air flow is twice as fast, two fans will blow twice as good. Otherwise there is little point.
Since your gap quenching sounds alright, I bet it is just an issue of tuning. Since your primary coil is all that deviates from your calculations, I would start there. Getting the right amount of turns is important, and even one extra turn on a spiral coil can increase inductance greatly. If you used bare copper pipe adjusting turns is an easy task. Wind a flat spiral coil like you calculated, and if possible measure the iductance. It should be 31.7µH. Good Luck!
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