Junction-gate field effect transistors have been used for preamplifier circuits of condenser microphones. In these circuits, however, field effect transistors are merely replacements of vacuum tubes, and the merits of their being semiconductor devices have not been utilized, except in that the circuit is miniaturized. A unique feature characterizing semiconductor devices is the existence of the complementary pair. By using a complementary source follower circuit, a high quality preamplifier for condenser microphones is realized. The principle and characteristics of the circuit, and its experimental data, are explained.
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