Factors affecting the design of switched transistor power amplifiers are discussed. Semiconductor devices now available for such applications are listed, and various means for producing variable mark/space ratio driving pulses are mentioned. Details are given of two transistor power amplifiers; these have maximum outputs of 2 watts and 1 kW, approximately. Their efficiencies are 92 and 99%, respectively.Finally, some applications of switched transistors in servo systems and a.f. amplifiers are mentioned.
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Ettinger et al. (1959) studied this question.
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