论文部分内容阅读
本刊2003年第3期刊出一篇《为防止电源接反有妙法》的文章,上面的方法笔者也曾试过,下面就谈谈笔者的一些看法:(1)1N4007之类的硅管正向导通,至少需要产生0.5～0.7V 的压降,若按文章所示,设电源电压为3V,二极管压降为0.6V,则电路须浪费1V 左右的电压,加之其内阻损耗,大约要浪费一半的电能,实属不值,即使用压降约0.3V 的锗管也需浪费约1V 的电压。(2)文章将硅桥接于电源连接线上,估计没人愿意在电源线上接这样一个小电路,况且笔者发现当供电电流大于0.2A 时硅桥便发热严重,简直有点烫手。(3)接入硅桥后发现,随身听音质有明显下降,将供电电压从3V提至5V 后有一定改善,但还是不如从前。为了解决以上缺点可将二
The third issue of 2003 issue of an article “in order to prevent the reverse power has a wonderful method,” the article, the above method I have tried, here to talk about some of the author’s views: (1) 1N4007 like silicon tube is To turn on, at least 0.5 ~ 0.7V need to produce a voltage drop, if the article shows, the power supply voltage is 3V, the diode voltage drop is 0.6V, the circuit to be a waste of about 1V voltage, combined with its resistance loss, about Half of the waste of energy, it is not worth, even with a pressure drop of about 0.3V germanium tube also need to waste about 1V voltage. (2) The article will be bridged to the power cable silicon, it is estimated that no one is willing to take such a small circuit in the power line, Moreover, I found that when the supply current is greater than 0.2A silicon bridge will heat serious, just a little hot. (3) access to the silicon bridge found, Walkman sound quality decreased significantly, the supply voltage raised from 3V to 5V after a certain improvement, but still not as good as before. In order to solve the above shortcomings can be two