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SP—2305型色谱仪微电流放大器前置级(静电计)的灯丝电源由15伏稳压电源供电,采用印刷电路插板,由于接触点多,常常由此造成仪器不能正常工作。针对这种情况,我们对原电路加以改进,用新型的国产三端固定集成稳压器W7815C(金属封装型)代之,且改制方便,效果良好。改制方法见图1和图2。
SP-2305-type chromatographic micro-current amplifier preamp (electrometer) filament power supply from the 15-volt power supply, the use of printed circuit board, due to more contact points, often resulting in the instrument does not work. In view of this situation, we have to improve the original circuit, with a new type of three-terminal fixed integrated voltage regulator W7815C (metal package type) instead, and the system is easy to change, the effect is good. The restructuring method is shown in Figure 1 and Figure 2.