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A study of the transfer function of contact-modulated amplifiers

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3 Author(s)
Krantz, F. H. ; Burroughs Corporation, Paoli, Pa. ; Salati, O. M. ; Berkowitz, R. S.

CONTACT MODULATORS, or ¿choppers,¿ are frequently used in modern circuit design where modulation (or demodulation) at a fixed frequency is required. Their advantages for this service include extremely high ratios of open-circuit to closed-circuit resistance, almost negligible internal noise, and excellent stability and reproducibility. These properties make the contact modulator particularly suitable for use in several types of d-c and a-c amplifiers as well as in d-c servomechanisms employing a-c control elements.

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American Institute of Electrical Engineers, Part II: Applications and Industry, Transactions of the  (Volume:76 ,  Issue: 1 )