Abstract
This paper describes the theory and design of a new low-cost analog multiplier suitable for use with the dc analog computers now widely applied as differential analyzers and equation solvers. The new multiplier comprises a simple relay circuit utilizing the time-division principle. The multiplier accepts input voltages of both signs and is capable of multiplication to within an accuracy of 3.5 percent of full scale at zero frequency and 7 percent of full scale through the frequency range between 0 and 10 cycles per second. Greater accuracy is possible through sacrifices in the useful frequency range. The dynamic range of input and output voltages is −80 volt to +80 volts. The multiplier circuit proper contains no vacuum tubes, servomechanisms, or power supplies but utilizes one of the operational amplifiers of the dc analog computer with which it is used.
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