业余无线电爱好者绘制印刷电路板,采用毛笔或蘸水笔描板时,常感不便。笔者采用废旧医用注射器来描绘印刷电路板,十分方便。使用方法是:将注射器针头在油石上磨平,然后装上,即可抽吸油漆(油漆太稠,可用香蕉水调稀)。用时,手握注射器,使它与敷铜板倾斜约60度左右。如久停不 Amateur radio enthusiasts draw printed circuit boards that often feel inconvenient when styled with a brush or dip. The author uses discarded medical syringe to depict the printed circuit board, very convenient. How to use: The syringe needle polished on the stone, and then loaded, you can suck the paint (paint is too thick, available banana water dilute). When used, hold the syringe, make it inclined with the copper clad plate about 60 degrees. If not stop for a long time