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Registered Member #799
Joined: Wed May 23 2007, 05:24PM
Location: Barrie. Ontario, Canada
Posts: 25
Hello forum guys,
I am trying to build a a tesla coil but have some difficulty. I am using a 10 kV , 30 mA neon sign transformer ( picture is attached). The two terminals of teh power supply are connected across the the spark gap.The spark gap is parallel with a 6.6 nf capacitor ( I have 15, 1kV, 100 nf capaciors in series) and a primary of tesla coil which is about 11 uH. The resoannce frequncy is about 620kHz.
The problem is I get good sparking in spark gap ( I have 4 copper rods 1 mm apart) when I connect teh power supply but as soon as I connect the primary coil, the sparking dies. I have tried the Oudin configuration ( where the supply is across the capacitor) and the normal configuartion ( where the supply is across the spark gap) and the same problem.
The only think that works is if I put the power suply, capacitor, primary coil and spark gap in series in that order. I thinkeither teh power supply or teh capacitor may not be suiatble.
Pictures of spark gap, capacitor and power supply are attached.
Registered Member #799
Joined: Wed May 23 2007, 05:24PM
Location: Barrie. Ontario, Canada
Posts: 25
Dago,
I did connect the capacitor in series with teh primary coil. I was saying that I connected the spark gap in parallel with the series combination of capcitor and primary coil. As soon as I coonect the spek gap to the series LC circuit ,the sparking stops. See sttahced diagram.
I have also tried the other setting where the power supply is across the capacitor and the series combination of spark gap + primary are in parallel with it. Sameproblem there. see attached.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
That looks like a high frequency electronic neon power supply. Tesla coils don't work properly with these, you're supposed to use an old-fashioned neon sign transformer with a real iron core.
If you are feeling brave, you might want to try adding a rectifier made of high voltage fast recovery diodes. If the output of that thing was rectified, it might work.
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
I've tried the HF Electronic PS's and I imagine at some point Steve it'd fail. I tried to the same thing a few years ago off the idea from I think...Extreme electronics where the ac was rectified and put through a cap bank and some other suff, the coil produced extremely weak arcs regardles to what I did until it killed the rectifier and the ps, after blowing the PS's fuse and several electronics that I could never really find what the problem was.
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Tesla coil quenching problem ( #2)he supply is acrosos
