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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© 1954 American Institute of Physics.
1954
American Institute of Physics
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