“胆石”复合式耳机放大器的设计

Design of “Gallstone” compound headphone amplifier

在电子管耳机放大器的输出级设计中,电子管较高的内阻使其难以驱动低阻耳机;利用电子管与晶体管构成的复合式单端推挽(Single-Ended Push-Pull,SEPP)电路,在保留电子管音色特点的同时,又显著降低了放大器的输出阻抗;利用Multisim软件进行仿真,得出输入级和输出级的主要参数,包括整个放大器的开环和闭环参数。

In the output stage design of the electron tube headphone amplifier,the high resistance of electron tube makes it difficult to drive the low-impedance headphones.A composite Single-Ended PushPull （SEPP） circuit combines electron tube and transistor is designed in this paper,it retains the tube sound characteristics as well as significantly reduces the output impedance of the amplifier.By using Multisim software,the primary parameters for amplifier input and output stages are simulated,including its open-loop and closed-loop parameters.