针对沈阳万泉无线电器材厂生产的CDSO_2-1型携带式二氧化硫检测仪使用中经常出现仪器内电磁泵工作的故障,进行了一些简单的改革。仪器改装前后的电路见图1(a)和(b)。原电路中存在的寄生振荡电压高达40伏左右,超过了晶体管反向击穿电压BV_(ce)。采用阻尼二极 Aiming at the CDSO_2-1 Portable Sulfur Dioxide Detector produced by Shenyang Wanquan Radio Equipment Factory, some faults of the electromagnetic pump in the instrument often occurred during the operation, and some simple reforms were carried out. Before and after the conversion of the instrument shown in Figure 1 (a) and (b). The original circuit exists in the parasitic oscillation voltage up to 40 volts, exceeding the transistor reverse breakdown voltage BV_ (ce). Damping diode