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Question on calculating resonance



Original poster: "Angelini, Frank J" <FrankJAngelini@xxxxxxxxx>


I saw this diagram in an old magazine describing a horizontally oriented tesla coil. The secondary was approx 6-inches in dia and about 24-inches long. The primary was 8-inches in dia and maybe 10 turns of edge-wound copper strip. The primary was mounted in the center of the secondary and both were horizontally oriented. The primary was center-tapped and connected to a straight gap as shown. Not sure of the sec. winding length or cap values. T1 was 9 kV @ 500 VA.

Question: how would you calculate cap values for resonance? I thought, perhaps, that this is in effect, two 1/4-wave primaries and a 1/2-wave secondary.