A 7500 to 15000 volt unit is perfect for a 30-inch coil and will produce a corona anywhere from 12 to 20 inches in length. These units are usually rated around 30 to 120 mA and come in various voltages. My first coil was built around a commercially available neon sign transformer. Just to refresh your memory, a Tesla is a unit of magnetic flux. The working of a transformer offers a unique visual aid for teaching a new ham candidate resonant circuit theory as he observes a crackling eighteen-inch spark discharge itself into the air. Although it won't find too much use in the hamshack, it provides such an awesome demonstration of electrical resonance that one would make an ideal ham club project. The spark-excited Tesla high-frequency transformer provides a display that leaves most first-time observers wide-eyed and speechless. A unique demonstration of electrical resonance for the experienced hobbyist.
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