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贵刊2000年第三期38页的《电子灯光抓阄器》一文,原理简单、实用性强,很适合初学者自制。但经分析和实验后认为该电路可以简化。原电路中,R4-R13这十个2k电阻的作用有二。一是限流,保护发光二极管使其不致过流损坏;二是提升复位端的复位电压,使其大于3V。表面上看,这十个电阻缺不一可。但该电路在实际工作中每个发光二极管总是依次点亮又
Your 2000 issue of the 38th page of the “electronic light catcher” article, the principle is simple, practical, it is suitable for beginners to make. However, after analysis and experiment that the circuit can be simplified. The original circuit, R4-R13 the role of these two 2k resistors have two. First, current limiting, protection of light-emitting diodes so that it will not cause over-current damage; the second is to enhance the reset reset voltage to make it greater than 3V. On the surface, these ten resistors are missing. However, in actual operation of the circuit, each LED is always lit in turn