Amplifiers – Combined with automatic amplifier disabling switch means
Patent
1973-09-17
1976-02-17
Rolinec, R. V.
Amplifiers
Combined with automatic amplifier disabling switch means
307241, 330 30R, 330124R, H03F 114
Patent
active
039394352
ABSTRACT:
A power amplifier device comprised of at least two amplifying circuits, each including an input, at least one voltage amplifier stage, at least one power amplifier stage adapted for signal impedance conversion, and an output, all connected in series, and further including a signal input terminal and a signal output terminal. Plural switch means are provided for selectively interconnecting the voltage amplifier stages and the power amplifier stages of the amplifying circuits for selectively establishing a parallel connected amplifying circuit, individual amplifying circuits and a balanced transformerless connection across the signal output terminals. In the parallel connected amplifying circuit, the plural switch means are operated to connect the amplifying circuit inputs in parallel, the amplifying circuit outputs in parallel and the respective amplifier stages and the respective power amplifier stages of the amplifying circuits in parallel. In the individual amplifying circuits, the plural switch means are operated to connect the amplifying circuit inputs and the amplifying outputs to corresponding signal input terminals and signal output terminals, respectively. In the balanced transformerless connection, the plural switch means are operated to connect a first amplifying circuit output to a second amplifying circuit input and to connect the amplifying circuit outputs to respective signal output terminals.
REFERENCES:
patent: 2464353 (1949-03-01), Smith et al.
patent: 2928982 (1960-03-01), Sprengeler
patent: 3213198 (1965-10-01), Claras et al.
Dahl Lawrence J.
Eslinger Lewis H.
Rolinec R. V.
Sinderbrand Alvin
Sony Corporation
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