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Re: [TCML] Nearly First Firing



Hi Simon,

An ascii diagram of the circuit might be helpful.

Because the gap fires without the cap yet doesn't with the cap may indicate a connection issue or possibly a very low current NST. But, you say from deepfriedneon calc's, so .016uF, I assume the NST was suppose to be 40mA short circuit current rating (400VA NST)? If true, then maybe there is a connection issue. Is the gap across the NST before the cap or after? Should be before the cap.

Here's a schematic of my 4.5" spark gap coil which may be useful to double check connections.
http://www.classictesla.com/photos/ba45/sch45.pdf

If your circuit appears ok to you, then it sounds like a current issue with the NST.

Take care,
Bart

Simon Dodd wrote:
Hi Guys,

I went for first light this evening!! Unfortunately there was nothing! My spark gap fires when there is no capacitor bank in place but as soon as I put my MMC into the circuit and connect the main parts of the coil, the spark gap stops firing :-( I am using a 10Kv NST with a static spark gap and 16, 20Kv 1000pf capacitors in parallel. These are from the calculations on deepfriedneon. The spark gap will fire if the lead to the outer ring of the primary is left unconnected.

Im sorry its not too clear, I can do a quick diagram if you want more info.

Thanks for your help again

Simon
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