抄録
The effective feedback quantity of the feedback amplifier that has a negative output voltage feedback and a positive output current feedback is controlled by its output current. In other words, the internal impedance of a feedback amplifier takes positive or negative sign according as the increment of the output voltage is larger or smaller than the voltage drop due to the internal impedance of the amplifier when the positive current feedback is removed. This paper deals with the analysis and experimental investigation on the above-mentioned phenomenon and it was revealed that this amplifier shows, under certain conditions, superior characteristic for the purpose of sound reproduction by loud speaker and other purposes as compared with usual negative feedback amplifiers.
