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CONTACT MODULATORS, or Â¿choppers,Â¿ 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.
American Institute of Electrical Engineers, Part II: Applications and Industry, Transactions of the (Volume:76 , Issue: 1 )
Date of Publication: March 1957