常见的功率超声源绝大多数是电子管型的.它们都存在着线路制式陈旧;系列化、标准化和积木化的程度较低及可靠性指标不明确等弊端.同时,绝大多数电子管型的超声源还具有功耗大、效率低、笨重等缺点.笔者试用窄带D类晶体管功放电路作为功率超声源.实践表明,这种电路性能优异. Most of the common ultrasonic power sources are of the electron tube type, all of which have the problems of obsolescence of the line system, the low degree of serialization, standardization and building blocks, and the uncertainty of the reliability index, etc. At the same time, most of the tube-type ultrasonic The source also has a large power consumption, low efficiency, bulky and other shortcomings. I try to narrow the class D transistor power amplifier circuit as a power ultrasonic source. Practice shows that this circuit is excellent.