实验电路板的安全保护

A Safeguard For Experimental Circuit-Plate

电子线路教学用实验电路板，数量大，内容多，由于使用者的不慎和没有设置安全保护措施，电路板经常出现元器件致损现象。本文分析了造成元器件损坏的主要原因，并在电路板的主要部位：电源端、输入端、输出端设置了保护电路，可使元器件的致损现象得到避免或改善。

Many of the experimental circuit-plates are used in electronic experiment teaching, Because of the carelessness or absence of a safeguard,the damage often takes place. In this paper,the reason is analyzed and measures to preventing thedamage are studied theoretically,a few kinds of guard circuit are designed for carry-in terminal, carry-out terminal and source terminal. The safeguard is provedsuccessful in practice.