| 摘要 |
PURPOSE:To improve the switching distortion and to avoid the variation in the circuit current at non-signal, by providing the current supply path from the regulated power supply at the base of composite PNP transistor, in the single ended push pull class B amplifier in quasi-complementary connection. CONSTITUTION:In the single ended push pull class B amplifier, in cascade connection of drive transistor TrQ5, output TrQ7, and in cascade connection of TrQ3, drive TrQ4 and output TrQ6, by means of composite PNP Darlington connection, the regulated power supply consisting of Zener diode D6, TrQ8 and resistor R14, is constituted, and the power supply circuit B is constituted by connecting resistors R13,R14,R15 and diodes D4,D5 to the regulated power supply. Further, the regulated power supply is fed to the base of TrQ4 of PNP composite Tr from the circuit B, to improve the wave distortion caused by switching and to reduce the variation in the current of TrQ3 to Q6. |
