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Характеристики транзистора (Транзистор- это просто 17)

Характеристики транзистора (Транзистор- это просто 17)

Channel: Радиолюбитель TV

Ток в полупроводниках (Транзистор - это просто - 5)

Ток в полупроводниках (Транзистор - это просто - 5)

Channel: Радиолюбитель TV

Схема радиоприёмника (Транзистор это просто 40)

Схема радиоприёмника (Транзистор это просто 40)

Channel: Радиолюбитель TV

Применение транзисторов (Транзистор это просто 41)

Применение транзисторов (Транзистор это просто 41)

Channel: Радиолюбитель TV

Реостатно - ёмкостная связь (Транзистор- это просто 32)

Реостатно - ёмкостная связь (Транзистор- это просто 32)

Channel: Радиолюбитель TV

Нагрузочная прямая ( Транзистор- это просто 21)

Нагрузочная прямая ( Транзистор- это просто 21)

Channel: Радиолюбитель TV

выпрямитель

транзистор

полупроводник

уроки электроники

электроника для чайников

электроника

радиоэлементы

электричество

схема

электрические схемы

Выбор рабочей точки

радиотехника

радиоэлектроника

основы электроники

электроника своими руками

радиолюбитель

в помощь радиолюбителю

школа радиолюбителя

схемы радиолюбителей

для начинающих радиолюбителей

книги по радиоэлектронике

уроки радиоэлектроники

лекции по электронике

начинающий радиолюбитель

00:00:04

I believe that with the knowledge I have acquired

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in the field of low frequencies, I can

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now calculate all the elements of transistor amplifiers,

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I have always admired your modesty, I

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am not being ironic in this area, everything is simple and

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clear when it comes to transformer

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coupling, then I will finish reading the ratio of the numbers of

00:00:21

turns that gives the best matching of

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cascades and believe me, extracting the

00:00:26

square root will not scare me, if

00:00:28

the question arises of a rheostat on capacitive

00:00:30

connections, then didn’t you study me

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to determine the load straight line, I will

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draw it in such a way that, being a tangent

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hyperbola of the permissible power, it

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will allow us to have the greatest amplitude of

00:00:41

signals at the output because the operating

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point will be located in the middle, at the risk of

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upsetting you, I must say that the

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situation is not so simple at first

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glance, you are right, but when calculating amplifiers,

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you must also take into account the available

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power band during the course, we will strengthen their frequencies, the

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role of feedback, the permissible

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distortion factor, and a host of other

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circumstances, it’s enough to bombard me with

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these requirements, I admit that

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I sinned from an excess of naive pride and

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nevertheless the matter looks quite

00:01:09

simple when we resort to the help of a

00:01:10

family of characteristics and the load

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straight line, our input signal signal can be

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considered as both voltage and current has the

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right to occupy a part of the load straight line

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limited by two points on one

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side. I then begin to bend

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characteristics a with another point b at

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which the base current approaches zero, which,

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as you know, is the cause of

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nonlinear distortions,

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undoubtedly, therefore the operating point p must be

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chosen at an equal distance. for in this

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case the maximum amplitude of the input

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signal will be p or pb, or rather the

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difference between the corresponding

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values of the base current or base voltage

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in my figure, this amplitude has a

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value of the order of 200 75 millivolts, it

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changes the collector current from 7 to 57 miles

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amperes with an average current value of

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32 milliamps. that is, the amplitude is 25

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milliamps

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wonderfully dislikes I hope that you are

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completely satisfied that the operation of

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your transistor is not quite as good as

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everything goes well with a large signal,

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just as much as I despair of the

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exorbitant energy consumption with weak

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signals or in the absence of an amplified

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signal, whatever the amplitude of the

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current consumption it always

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corresponds equally to point p a video of weak

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signals, the operating point could be

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moved lower to another load

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line corresponding to a lower current,

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for example, to the point along the line, as a result,

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energy consumption would be reduced and we

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would save on batteries, which are

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quite expensive, you want to

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ruin the manufacturing companies no, but I

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believe that when listening to a symphony, it is irrational

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to use during pianissimo the same

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power that is required by the moments of playing of the

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entire orchestra; however, I do not see how it would be possible to

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force the operating

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point to move to the lower load

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line in order to expend only the power

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strictly necessary to reproduce

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signals of different magnitudes without distortion.

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avoiding waste

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is commendable therefore I will gladly show you the

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appropriate means so that your

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operating point can move from one

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load line to another you need to

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change the bias voltage it must

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increase with the amplitude of the signal and it

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must be the signal itself since the signal

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is alternating current lighting is constant

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you know an excellent means for

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converting alternating current into

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direct current, this is the rectifier that

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is used to obtain an alternating

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bias, here is a practical circuit of an

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amplifier with a floating operating point, you

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see that the amplified signals taken from the

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additional winding on the output

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transformer are

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rectified using a

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semiconductor diode d they create a

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voltage drop at the resistance outputs r which makes point x a more

00:03:43

or less negative capacitor c

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heal the ripples of the rectified

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voltage are also increased corresponds to the

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average value of the amplified signal

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up to this reminds me of the aru system there we

00:03:54

also met a capacitor which,

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together with the resistance, gave the

00:03:58

aru system inertia to a flywheel-like

00:04:00

regulator, the comparison is very successful although

00:04:03

our device does not resemble as much as a

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conventional ara as an ara working

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inside out; here, too, the amplitudes of changes in the

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amplified voltages are rectified, after

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which they are used to control the

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bias at the input; indeed, at the

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beach, not at point x,

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the resistance r2 and r3 are applied to a common point, which

00:04:20

connects the base to the negative pole of the

00:04:22

power source; the correct choice of the

00:04:24

values of 3 resistances allows you

00:04:26

to make the bias proportional to the

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amplitude of the signals, so the base

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here becomes more negative

00:04:32

the stronger the signal, and but unlike the

00:04:34

familiar aru tube receivers,

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increasing the negative bias in the

00:04:39

base circuit of the pnp structure transistor does

00:04:41

not close it, but opens it even more; it

00:04:44

increases the base and collector currents of your

00:04:46

circuit with a floating point bias, I

00:04:48

really like it. When I assemble

00:04:50

my receiver using transistors, I will

00:04:51

certainly install a beautiful

00:04:53

push-pull cascade at the output with this device

00:04:55

giving sliding bias voltage in a

00:04:58

push-pull circuit. My dear dislikes

00:05:00

can be done better, but more about this next

00:05:02

time, watch the continuation and

00:05:04

subscribe to our channel so you don't

00:05:06

miss new episodes

Description:

Выбор рабочей точки транзистора. Экономичная схема с плавающей рабочей точкой. Применение выпрямителей. _______________________________________________ Смотрите наши видео, в которых мы простым языком рассказываем о радиотехнике, электронике и радиоэлектронике! Наши уроки будут особенно полезны для начинающих радиолюбителей и студентов радиотехнических ВУЗов. В видеороликах мы даём основы электроники: определения, описания, схемы и принцип работы различных элементов радиотехники. В наших видео вы узнаете: что такое транзистор, диод, конденсатор, резистор, микросхема, электрический ток и много других разных интересных вещей и явлений, связанных с электроникой.

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