![](https://csdnimg.cn/release/download_crawler_static/16585914/bg6.jpg)
26.简易催眠器.................................................................................................................................... 18
27.直流电机调速控制电路 .................................................................................................................. 18
28.用 555 制作的 D 类放大器 .............................................................................................................. 19
29.风扇周波调速电路 ......................................................................................................................... 19
30.电热毯温控器 ................................................................................................................................ 20
31.多用途延迟开关电源插座............................................................................................................... 20
32.新颖实用的直流低压稳压电源........................................................................................................ 21
四、附录................................................................................................................................................... 23