由555守时器构成的多谐振动器
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图1 多谐振动器 |
电源VCC经电阻R1、R2对电容C进行充电,vC开端上升,直至
![](http://www.591dg.com/uploads/allimg/blog/mcs1cj1qjqj.gif)
![](http://www.591dg.com/uploads/allimg/blog/tbime03mwtx.gif)
![](http://www.591dg.com/uploads/allimg/blog/fksappd3a1o.gif)
![](http://www.591dg.com/uploads/allimg/blog/tbime03mwtx.gif)
![](http://www.591dg.com/uploads/allimg/blog/fksappd3a1o.gif)
![](http://www.591dg.com/uploads/allimg/blog/mcs1cj1qjqj.gif)
tP1
![](http://www.591dg.com/uploads/allimg/blog/0gomxlumw4c.gif)
电容C从
![](http://www.591dg.com/uploads/allimg/blog/mcs1cj1qjqj.gif)
![](http://www.591dg.com/uploads/allimg/blog/fksappd3a1o.gif)
![](http://www.591dg.com/uploads/allimg/blog/0gomxlumw4c.gif)
所以,振动周期为:T=tP1+tP2
![](http://www.591dg.com/uploads/allimg/blog/0gomxlumw4c.gif)
振动频率为: f=
![](http://www.591dg.com/uploads/allimg/blog/4n4t15dlj22.gif)
由555守时器构成的振动器,最高作业频率可达300kHz。
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图2 占空比可调的多谐振动器图 |
![](http://www.591dg.com/uploads/allimg/blog/yf1j4bqzurb.gif)
图2 是占空比可调的多谐振动器。图中电位器RP用于调度充放电时刻常数, D1和D2两只二极管起到隔绝电容C的充电、放电路的效果。充电回路( VCC
![](http://www.591dg.com/uploads/allimg/blog/ewbvqahuohf.gif)
![](http://www.591dg.com/uploads/allimg/blog/qqhykylgir0.gif)
![](http://www.591dg.com/uploads/allimg/blog/ewbvqahuohf.gif)
![](http://www.591dg.com/uploads/allimg/blog/ewbvqahuohf.gif)
![](http://www.591dg.com/uploads/allimg/blog/ewbvqahuohf.gif)
![](http://www.591dg.com/uploads/allimg/blog/jqsgc1kt1tf.gif)
放电回路(C
![](http://www.591dg.com/uploads/allimg/blog/ewbvqahuohf.gif)
![](http://www.591dg.com/uploads/allimg/blog/ewbvqahuohf.gif)
![](http://www.591dg.com/uploads/allimg/blog/jgcwvrqj1co.gif)
![](http://www.591dg.com/uploads/allimg/blog/ewbvqahuohf.gif)
![](http://www.591dg.com/uploads/allimg/blog/svlnxymrqqv.gif)
方波的占空比
![](http://www.591dg.com/uploads/allimg/blog/hfbcwjiqffo.gif)
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下一篇:调制、解谐和变频-调制办法
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