Final Study and Development Report of High Efficiency Sonar Transmitters.
Final rept. 15 Jun 70-1 Jun 72 on Phase 2,
BOSE CORP FRAMINGHAM MA
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The basic issues of high-power audio-frequency amplification are reviewed. A study of a class of high-frequency switching sonar transmitters is presented. Basic design considerations for linear, baseband, switching, and high-frequency switching amplifiers are discussed. The application of presently available solid state devices to power amplification is considered. System and circuit considerations lead to the development of the current-controlled two-state modulation system. The operation of the current-controlled two-state modulation system as an audio power amplifier is analyzed. System characteristics are related to design parameters, and the design of a 1000 VA, 3.5 kHz amplifier is presented. A 500 VA breadboard circuit is used to evaluate this concept. A 1000 VA, 3 kHz current-controlled three-state brassboard amplifier is constructed and tested. This amplifier is used to evaluate various three-state control schemes and the practicality of variable output impedance control. Author
- Electrical and Electronic Equipment
- Acoustic Detection and Detectors