A switching transistor D-C to A-C converter having an output frequency proportional to the D-C input voltage

THE combination of transistors and transformers constructed of square hysteresis loop material has produced much useful circuitry outside of the realm of magnetic amplifiers per se. In this paper a highly efficient and extremely precise converter for transforming direct to alternating current, yielding a square-wave output whose frequency is proportional to the d-c input voltage, will be described. From among the many uses of this converter, the following applications will be discussed: 1. a transducer for telemetering systems, and 2. an integrator which has found application as an analogue to digital converter.