近几年来,对于延时灯的介绍在多种报刊上屡有所见,但多数电路元件较多,制作相对麻烦。笔者曾制作过一个简单的延时电路,使用五年,工作状况良好,由于外形尺寸较小,可直接装在开关盒内。见图 a、b。当合上按钮 K 时,经桥式整流后的直流电经10K 电阻对电容充电,当充电电压达到可控硅 In recent years, the introduction of delay lamps has been repeated in many newspapers and periodicals, but most of the circuit components are relatively complicated and the production is relatively troublesome. I have made a simple delay circuit, use five years, work well, due to the smaller size, can be directly installed in the switch box. See Figure a, b. When the button K is closed, the bridge-rectified direct current charges the capacitor through the 10K resistor, when the charging voltage reaches the thyristor