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在进行小功率整流器外特性或各种整流滤波器外特性研究时,往往需要一种高阻值的可变电阻器,这种可变电阻器要求阻值在5000欧以上,并在很大范围内可变,一般不容易解决.我们试制了一种超高阻电子管变阻器,经过二年来使用,认为性能良好,特此介绍给读者作为参考. 一、技术指标 1.电阻范围:从几百欧至数十兆欧可变; 2.允许电流值:0～200毫安. 二、工作原理图1为电路原理图,其中T_1为普通五灯收音机电源变压器,V_1为整流管,V_2为稳压管系稳定负压;V_3、
In the low-power rectifier external characteristics or a variety of rectifier filter characteristics, often require a high-resistance variable resistor, the variable resistor requires resistance in more than 5000 Europe, and in a wide range Within the variable, generally not easy to solve. We trial of a high resistance tube varistor, after two years of use, that the performance is good, hereby introduced to the reader as a reference. First, the technical indicators 1. Resistance range: from a few hundred European Dozens of megohm variable; 2. Allow the current value: 0 ~ 200 mA. Second, the working principle Figure 1 for the circuit diagram, where T_1 for the ordinary five-lamp radio power transformer, V_1 for the rectifier, V_2 for the regulator Department of stable negative pressure; V_3,