Huayu for engineering students

Chapter 144 Power Amplification
Today's small courtyard is very lively, because Wang Xu's roommates have come running, today is Sunday, a rare rest day.Wang Xu was originally looking for Zhou Feng to help him tinker with the speakers. Later, at the night's symposium, he said that everyone was planning to get involved, so come on, even the uncle Qiang from next door came over.

Ever since he started working on the "supercomputing" project, Uncle Qiang has often come to Wang Xu's dormitory, and he has almost become a dormitory member, kind of like a non-staff roommate.

Today was no exception. Hearing that Wang Xu was tossing about again, he followed suit.

Today, the carpenter Hu Yang reported for duty for the first time. He was arranged to find Wang Jinghua first, and was assigned to the logistics department. Anyway, people who don't know where to put them are usually put in this department.

Wang Xu told Sister Hua about this matter after the phone call yesterday. It's not a big deal to install someone, but Wang Jinghua is obviously very satisfied. Wang Xu finally remembered that there is still a listening room that he hasn't bothered about.

That set of landscape audio will be more expensive to rent than to buy. Well, Wang Xu admits that he has neglected him a bit.But I can't help it, I was too busy a while ago, with so many projects, so attractive, the hobby of listening room has been sidelined.

In the final analysis, there is a difference in mentality between Wang Xu and Wang Jinghua. Wang Xu only set up this studio for fun. Although he has a set of tricks when fooling people, Wang Xu himself knows that he didn't invest too much in it. s concern.

At the beginning, I was more concerned that as long as I had a good recording studio, I could record my own and Wang Fei's songs.It was only after we came up with the nomination head that we came up with the idea of ​​looking at the whole country and even overseas.

My own interest is more about creation. Whether it is copied or not, it is still not in the world. If I bring it by myself, the sense of accomplishment even exceeds the pleasure of making money from it.

I don't have enough time lately, and Wang Xu has already planned to quit the last two games of the evening.Because of his reputation, the first game alone can already generate almost 50 emotional points, and he is not in a hurry to change skills, so let's stop some of them first.

In this way, you can free up some time to do something you like, such as the few paintings that have not yet been written when the inspiration came last time.

As for the daytime, isn't there more interesting things, such as power amplifiers and speakers that we are working on now.

Audio equipment, to put it simply, is a bunch of things that play out the stored audio so that people can hear it.From a small speaker that costs a few dollars, a large speaker that is common in rural areas for tens of dollars, an integrated system that broadcasts on the street for hundreds of dollars, a combination of thousands of dollars for luxury homes, and a set of villa equipment worth millions, Tens of millions of stage equipment, and hundreds of millions of stadium equipment.

It can cover almost any price point you can think of. Anyway, something as simple as playing music can really drive you to death.

Well, if you insist that there are still billions of Soviet black technology that can blow up rabbits, then you are purely exaggerating.

The technology Wang Xu bought was speakers, but after the goods arrived, Wang Xu saw a combination of a bunch of speakers.There are many sizes, both active and passive. It looks like a series of products of the same brand.

All products are accompanied by detailed technical documentation, which is more like a thesis than an instruction manual, which theoretically demonstrates the sound characteristics of these speakers. I feel that these documents are much more valuable than the drawings of the speakers.

Of course, there are piles of various raw materials, and the production methods of the components, some of which are even the same as the microphones bought before, such as the black fiber cloth covering the outside.

Wang Xu intends to make these things slowly and try them out. Of course, the speaker itself is the first. This time, he used the method of substituting parts to see the quality of the speaker first.

Speakers are too subjective. If you want to talk about microphones, you can still talk about the number one in the world. After all, there are hard indicators there.But when it comes to the speaker, it's nonsense, everyone is the first, but no one can really convince others.

Now that Populus euphratica has arrived, let him make the box first. The production of this thing is not troublesome, but it takes a lot of time. The drying time alone takes more than a week.

Hu Yang is indeed an old carpenter. Wang Xu drew a sketch at random, ticked off a few dimensions, and after a little explanation, he understood what he was going to do.Without any nonsense, I took the initiative to go to the warehouse to cut materials and work.There was originally a small carpentry room next to the warehouse, which was arranged during the renovation.

Since he came to the present, he has never asked any other questions except where are the tools, where are the materials, and where is the workshop.

It's a strange person, isn't he talking about rock and roll youth? Why is there a sense of drowsiness? The contrast is too strong. Now you say that he is a professional carpenter, Wang Xu will not be surprised at all.

Forget it, never mind, Wang Xu is not good at psychological counseling, he looks at the old brother's movements from a distance, he is very professional, making such a box should not cause problems, then go back and ask Lao Yu, he Should know something about it.

The brothers from the dormitory are looking at a circuit diagram that Wang Xu gave them. This diagram was not bought, but designed by Wang Xu himself. Of course, its core foundation still comes from the system.

It is a set of internal decoding and amplification circuits for active speakers, but what is interesting is that the decoding part is very simple, and there is no big difference between the previous products in Wang Xu's memory.

However, the power amplification part has made quite a lot of interesting innovations. If nothing else, these circuits should be able to reduce some clutter that occurs during the amplification process. In layman's terms, it is to ensure that the amplified signal is more consistent with the original one. .

Wang Xu intends to take this part out separately, and let him see the effect after successful completion.

The speakers are not really needed by Mizuki's brothers, and they can't help, but here we can let them do it.I have already done a signal reception, and it should be okay to do a power amplification.

Holding the blueprint, he explained it to his brothers in detail from beginning to end, but the result was beyond Wang Xu's expectation.

Several brothers have just started to learn circuit professional courses at this moment.Although adhering to the tradition of Xueba, he has already finished reading the book early.But looking at such a complicated circuit diagram, I am still a little confused.

The same goes for Wang Xu. There are times when Xueba has not learned it yet, and I am a little impatient, but we dare not pull out the seedlings to encourage growth in other places. In the land of Mizuki, I am really not afraid of this. It should be a problem for them to measure up. not big.

So, avoiding his roommates, Wang Xu quietly called Teacher Yan.After talking about the cause and effect of this matter, Mr. Yan heard it, it’s a good thing, the circuit was paid attention last time, so I can’t expect too much to report this time.

So I immediately promised, no problem, you let a few of them come to me, and I will arrange a teacher for them.Isn't it just a surprise boost to their progress, who hasn't done the Olympiad.

(End of this chapter)