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本刊2001年第6期第17页一文所述方法简单易制,但原因中存在错误之处,给初学者制作带来误导,现特予改正,改正后的图如图1(b)所示。原图见图1(a)所示,文中述说,当主电压高于108 V时,DV1、DV2均导通,双色发光管发出黄光。由于电路中存在问题,故此说法不能成立,其原因从电路上可看出DV1与DV2是并联的,这个电路的原理类同于一般简单的稳压器,不管A点电压多高,由于R1的限流,
The method described in the article is simple and easy to make, but there are mistakes in the reasons for misleading the production for beginners. We hereby give special rectification. The corrected figure is shown in Figure 1 (b) Show. The original image is shown in Figure 1 (a), the article said that when the main voltage is higher than 108 V, DV1, DV2 are turned on, two-color LED yellow light. Because there are problems in the circuit, so the statement can not be established, the reason can be seen from the circuit DV1 and DV2 are in parallel, the principle of this circuit is similar to the general simple voltage regulator, no matter how high the voltage at point A, R1 Limiting,