Transcendental function analogue computation with magnetic cores
David H. Schaefer, R. L. Van Allen · Transactions of the American Institute of Electrical Engineers Part I Communication and Electronics · 1956
SQUARE loop magnetic cores used in conjunction with switching transistors can be made to perform a great number of arithmetical operations. Previous papers have shown how these elements can be used to obtain 4-quadrant multiplication1 and division2. This paper presents a basic circuit and shows how this circuitry can be utilized to obtain various sorts of computations. Specifically, experimental data are presented showing results obtained with the use of the circuit to obtain an output voltage proportional to the square root and other fractional powers of an input voltage, the arc sine of an input voltage, the sine of an input voltage and the product of two voltages. These are only a few of the possible outputs which are theoretically attainable.