搜索 - 科创

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能有效控制220V3000W左右的电加热丝长时间且能频繁启动和停止不间断运行，要求安全可靠性必须高此项是关键！成本可暂不计！先谢谢了！

与门前接一个电位器，可以调整死区，给100电容nf充满电前为死区，电位器调的越大死区时间越长，这样对不对？但值得一提的是，那个电容是怎么放电的？

58型无线电步谈机58型无线电步谈机是安徽省邮电器材厂的产品。这是一种收发两用便携式无线电台，适合于移动性较大的短距离无线电通信，最大通话距离为5公里。由于工作频率选择于超短波范围，因此使用步谈机作联...

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