4.3.1 多功能信号发生器的设计......................................................66 4.3.2 带前置放大的音频功率放大器................................................66 4.3.3 连续输出的直流稳压电源......................................................66 4.3.4 正负双路输出直流稳压电源...................................................66 4.3.5 输出两路正电压的直流稳压电源.............................................66 4.3.6 不间断直流稳压电源............................................................66 4.3.7 多级低频电压放大器............................................................66 4.3.8 双工有线对讲机电路设计...................................................