文件含Altium Designer13所画的原理图、pcb。

TDA1308是一块新型的低电压、低失真、高速率、强输出的运算放大器集成电路。它的输出级采用了MOS管，可以直接推动32Ω的耳机。在TDA1308电路的应用说明书中，给出一个增益为1的单端供电、负端输入放大电路，但笔者试改变其外围，把它接成双端供电的正输入放大电路，增益为10倍。这样改进的优点是，取消了输出电容，拓展了低频下限，并得到了所需的增益倍数。这个电路如图1所示。NE5532N构成的10倍线路放大器非常接近，除了增加由R3、C4和R7、C13构成的两个RC消振网络以外其余基本相同。该放大器的关键就在于选材与制作工艺。袖珍耳机放大器电路:-TDA1308 is a new type of low voltage, low distortion, high speed, strong output operational amplifier IC. Its output stage used the MOS tube, can directly drive 32 Ω headphones. In TDA1308 circuit application instruction, shows a gain of 1 single-ended input amplifier circuit power supply and the negative side, but I try to change its periphery, take it into double side power supply is input amplifier circuit, the gain of 10 times. The advantage of this improvement is that cancelled the output capacitance, extends the low frequency limit, and received the required gain multiple. This circuit is shown in figure 1. NE5532N amplifier is very close to 10 times of circuitry, in addition to increasing composed of R3, C4 and R7, C13 two RC damping networks outside the rest are basically the same. The key in the amplifier