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Preparation
Ground your work before you begin. A buzz coil receives its name from the buzzing it makes when the electrical field within it expands and collapses. This occurs when the necessary voltage is generated. This high voltage means the equipment you're working with can be extremely hazardous -- so treat it with respect, and work safely.
Requirements
Collect the necessary components for the buzz-coil installation ahead of time. To hook up a homemade buzz coil, you will need a supply voltage, which is typically a 6- to 12-volt battery; the coil itself, which is basically a step-up transformer; an automotive ignition condenser; a relay; a spark-plug wire; and a spark plug. You will also need 14-gauge wire and a couple of spade-type connectors.
Wiring
Wire the switch to the normally closed terminal pin of the relay load circuit. Connect the relay̵7;s load output pin to one end of the primary winding of the coil. Ensure you also run the condenser parallel to this from the relay̵7;s supply pin to the coil. The relay̵7;s two output pins should now be run to the negative, or ground, pin on the battery. The second side of the coil̵7;s primary winding should also be run to ground. Connect the output of the coil̵7;s secondary winding to the spark plug, by using the plug wire. Finally, connect the positive lead of the battery to the switch.
Completion
Turn the switch on and place the spark plug near a ground source for the circuit. The unit should create a spark that can be up to an inch long. It will make quite a racket, which is normal. Whatever your need is for building one of these circuits, this simple, yet reliable unit should give you plenty of service. Due to the hazard of working with electrical equipment, work with a qualified technician if you're unfamiliar with the process and its safety features.