它是三极管放大器的等效电路。
大多数传统的音频功率放大器是用双极型工艺设计和制造，其基础在于良好的双极型三极管特性。
Majority of conventional power amplifiers are designed using bipolar technology on the basis of well-known merits of bipolar transistors.
在不使用运算放大器的情况下，直接利用晶体三极管与数字式电流表测出扩散电流，可以得到较为准确的玻尔兹曼常量。
The diffusion current is measured using transistor and digital ammeter instead of operational amplifiers, and the Boltzmann constant is obtained accurately.
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