我是用430来检测正弦信号的幅值,但最大幅值5v已经超过430能承受的3.6v。电源供电是5v。
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我是用430来检测正弦信号的幅值,但最大幅值5v已经超过430能承受的3.6v。电源供电是5v。
因为信号频率不高,最高位50k,能不能就用简单的电阻分压来实现?
正弦信号哪里来的?该信号源的输出电阻有多大?
如果比较小的话,可以用两个大电阻分压,把幅值降到2.5V,然后再加1级运放做跟随后,输入到430.