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振荡电路

图1 是一个驱动电路,只需要15V供电就能驱动5.8NF的负载。图2-3是负载两端的输出波形。

这个驱动没琢磨出来,用的啥振荡电路,哪几个是选频网络,,怎么算出来的。。  还请坛友们赐教 。  

这电路是我对着都没仿真出来波形,不知道还差了啥。。。