肌电信号采集电路设计图
SEMG肌电采集板，包括肌电采集原理图和PCB。
原理图中包括前置放大电路，滤波电路，二级放大电路，电平抬升电路。
前置放大电路由仪表放大器构成，通过电极板采集微弱的SEMG（0～2mv）滤波电路包括二阶有源高通滤波和二阶有源低通滤波以及50Hz工频滤波电路（可滤除20Hz以下，50Hz，500Hz的干扰信号），后经过二级放大电路输出位较干净的SEMG（-1～1v），最后通过电平抬升电路将SEMG抬升到0～2v给单片机采集。
整个电路可自行改变滤波电阻电容的值，改变滤波频段值。
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