Specialty Transformers Specialty Transformers are in stock at Kynix Electronics. Kynix offers inventory, pricing, & datasheets for Specialty Transformers.There are other types of Specialty Transformers such as transactors, Hedgehogs, Variometer and variocoupler and others A transactor is a combination of a transformer and a reactor. A transactor has an iron core with an air-gap, which limits the coupling between windings. Hedgehog transformers are occasionally encountered in homemade 1920s radios. They are homemade audio interstage coupling transformers. Enamelled copper wire is wound round the central half of the length of a bundle of insulated iron wire, to make the windings. The ends of the iron wires are then bent around the electrical winding to complete the magnetic circuit, and the whole is wrapped with tape or string to hold it together. A variometer is a type of continuously variable air-core RF inductor with two windings. One common form consisted of a coil wound on a short hollow cylindrical form, with a second smaller coil inside, mounted on a shaft so its magnetic axis can be rotated with respect to the outer coil. The two coils are connected in series. When the two coils are collinear, with their magnetic fields pointed in the same direction, the two magnetic fields add, and the inductance is maximum. If the inner coil is rotated so its axis is at an angle to the outer coil, the magnetic fields do not add and the inductance is less. To know more, please view our large section of Specialty Transformers below.