J40S-精密电位器:日本COPAL线绕单圈精密电位器,长寿命,高可靠性,超低噪音.分J40S/J45S/J50S三个系列,阻值分布为:500,1K,2K,5K,10K,20K,50K;阻值公差:±5%;有效电子转角:353°±1.5°;机械转角:360°连续;旋转寿命:10,000,000转.