论文部分内容阅读
笔者前段时间购买了一款AKG K70耳机(阻抗为100Ω),为了用好这款耳机,准备为耳机配上放大器。经查阅资料,制作了这款纯甲类耳机放大器,效果不错。电路原理如附图所示。R3和R4有两个作用:一是使IC(TL072)工作在甲类;二是为BG1、BG2提供偏压。如果采用其它IC,需要改变R3、R4大小;耦合电容C1应选用优质薄膜电容,其它阻容元件力求参数准确;R5、R6可用1/2 W或1W金属
Some time ago I bought an AKG K70 headphones (impedance 100Ω), in order to make good use of this headset, ready to be equipped with headphones amplifier. After access to information, produced this pure class a headphone amplifier, the effect is good. Circuit principle as shown in the figure. R3 and R4 have two functions: one is to make IC (TL072) work in Class A; the other is to bias BG1 and BG2. If you use other IC, you need to change the size of R3, R4; coupling capacitor C1 should be selected high-quality film capacitors, RCA components and strive to accurate parameters; R5, R6 available 1/2 W or 1W metal