Derivative-controlled magnetic amplifiers

ALTHOUGH magnetic amplifiers have been in use for a great many years, it is only in the past few that they have widespread attention. Their development has been vastly accelerated by the development of high quality core materials and rectifiers, and the recognition of the vital role that rectifiers may play in magnetic-amplifier circuits. Thus the self-saturating magnetic amplifier1,2 incorporating rectifiers in series with the load windings, was invented and was found to have a high gain to time constant ratio.