Attestation DC 12-30V High Voltage Arc Generator ZVS Fly back Driver Kit for SGT Marx Generator EE —— gestation fly back drive circuit, which is used to drive the ignition coil, has Zero Voltage Switching, so iris called as "IVS crouton. With big power; low heat and reliability; its widely used In driveshaft spark gap teals coll (SGT) and Jacob, ladders, Marx generator, etc.