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电感线圈与电容器并联可组成lc调谐电路</h3>
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<p><strong>电感线圈</strong>与电容器并联可组成lc调谐电路。即电路的固有振荡频率f0与非交流信号的频率f相等，则回路的感抗与容抗也相等，于是电磁能量就在电感、电容来回振荡，这lc回路的谐振现象。谐振时电路的感抗与容抗等值又反向，回路总电流的感抗最小，电流量最大（?f=“f0“的交流信号），lc谐振电路具有选择频率的作用，能将某一频率f的交流信号选择出来?/p>
<p>在选择和使用电感线圈时，首先要想到线圈的检查测量，而后去判断线圈的质量好坏和优劣。欲准确检测电感线圈的电感量和品质因数Q，一般均需要专门仪器，而且测试方法较为复杂。在实际工作中，一般不进行这种检测，仅进行线圈的通断检查和Q值的大小判断?/p>
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