为什么三极管集电极接在中周的中间点

2024-05-18

1. 为什么三极管集电极接在中周的中间点

匿名提问找不到了吧?呵呵!再回答一次。


这种部分接入的主要目的,是减小三极管输出电阻rce对谐振阻抗及Q值的影响。 

设中周的中间点到直流电源点的圈数为n1,中周初级线圈总圈数为n2,变比n=n2/n1,当rce并连到n1线圈时,折算到n2线圈将是rce的n方倍,使谐振阻抗及Q值只有少量下降,保证了足够的电压放大倍数和选择性指标。 

早期的电子管收音机中,由于电子管的输出阻抗极大,根本不用考虑这个问题,所以在电子管电路中就不存在“接中周中间点”的接法。

为什么三极管集电极接在中周的中间点

2. 三极管驱动继电器电路中,继电器为什么接在三极管集电极,它能接在发射极吗?

不能。因为集电极链接工作电源并且耐压高,串联继电器,二者都是高压工作。放在发射极的时候虽然驱动电流够了但是BE结耐压不够,一旦失去电压继电器线圈的感应电动势可以轻松击穿BE结。

3. 为什么将三极管的两个集电极相连就构成了“与”逻辑

请采纳我的问题

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I played for a long time, please

为什么将三极管的两个集电极相连就构成了“与”逻辑

4. 现有200米无线发射模块电路 中间俩个三极管集电极 发射极 基极接一起 是干嘛的 为什么这样接,

两个并联的三极管,用于加大输出电流,亦即加大输出功率,他们只工作在上半周期,并且导通角小于90?? 当然也可以用一个大功率管来实现,这里是为了让你认识和理解在高频电路中,增加功率是如此简单;

5. NPN三极管共射极接法中,输出端为集电极,但为什么集电极电流的方向是流向集电极,而不是流出集电极?

因为NPN的三极管,集电极是接正电,(发射极处在负端),
按照电学的规定,电流是正极流向负极(和电子流向相反),所以就有你说的“集电极电流的方向是流向集电极,”,这是规定,就这么简单。
你再看看,在研究PNP三极管时,就会看到“流出集电极”的说法

NPN三极管共射极接法中,输出端为集电极,但为什么集电极电流的方向是流向集电极,而不是流出集电极?

6. 为什么三极管把基极和集电极连接起来,就起到了二极管的作用?

三极管是有两个P-N结组成的,二极管只有一个P-N结,所以,三极管的发射极与基极之间就是一个P-N结、他就是一个二极管。
不用将基极与集电极相接!将集电极悬空或剪掉都一样。

7. 用电器应该接在三极管的集电极还是发射极

三极管分为:pnp和npn。

工作状态分为两种:放大状态和饱和状态。
    你上面的应用是应用了三极管的饱和开关状态,从技术层面上来说,你将led接在发射极和集电极都可以,只要三极管导通均可正常工作。
    但是在电路设计中比较规范一点的设计是:LED接在NPN的集电极,LED接在PNP的发射极。

用电器应该接在三极管的集电极还是发射极

8. 三极管集电极为什么接地

你这个管子应该是PNP管,是用负电源供电的吧?