Self-regulation in magnetic-transistor amplifiers

Magnetic amplifiers incorporating transistors have received considerable emphasis in the literature. Many circuits have been devised using magnetic amplifiers and transistors in combination to achieve many different characteristics. This paper describes a characteristic available with this combination of devices that has not been heretofore described. By utilization of the circuitry to be described, an amplifier can be designed that has a self-regulated output for variations in supply excitation. This characteristic is inherent to the circuitry; not accomplished by the addition of compensating networks. While self-regulation is the primary advantage to be gained by use of the circuitry, no sacrifice is made in gain, temperature stability, or frequency stability from that of a conventional magnetic amplifier. In addition, since the transistor is utilized only as a switch (transistors have very low saturated resistances as compared with magnetic amplifiers) the regulation of the device with load is very good.