物理化学实验,电导度测定及电导滴定,应用音频振荡器作惠斯登电桥的讯号电源。对振荡器的要求,只要能获得较稳定的等幅振荡,声强适中,有一个固定频率输出(一般在四百赫到千赫左右)即可。但一般市售的音频振荡器,多半不是为化学测定设计的,结构较为复杂,价格亦较昂贵。其中许多元件如频率分度等在化学测定中并非必要,也有的输出功率过强,不但浪费电力,在溶液测定中也不方便,且市售多夹有直流成份输出,用在化学溶液中或多或少有电解发生。作者装置一台相移式线路的音频振荡器,结构简单易制,只用两个国产电子管,输出用电铃变压器以消 Physicochemical experiments, conductivity measurement and conductivity titration, the application of audio oscillator for the Wheatstone bridge signal power. The requirements of the oscillator, as long as it can get a more stable amplitude oscillation, moderate sound intensity, there is a fixed frequency output (usually in the four hundred hertz to about kHz) can be. However, most commercially available audio oscillators are not designed for chemical assays. Their structure is complicated and the price is relatively expensive. Many of these components, such as frequency divider, are not necessary for chemical determinations. Some of them are too powerful for output, which is not only a waste of electricity but also inconvenient for solution determination. Commercially available DC components are used for output and are used in chemical solutions or Electrolysis occurs more or less. The author installs a phase shift line audio oscillator, the structure is simple and easy system, only two domestic electron tube, the output with a bell transformer to eliminate