Chapter 102 Unparalleled Mechanical Zhang Fei

The physics teacher's repair shop is at the gate of Huangnigang No. 16 Middle School.

In a rammed earth hut, there are three black-and-white TVs awaiting repair and numerous old radios.

These days, it’s normal for teachers to have a side job.

Like Huangnigang.

The county finance allocates funds to the township, and the township pays salaries to the teachers.

If the county has no money, the township can only give me a white slip, that is, the monthly salary will not be cashed and will be settled at the end of the year.

If you still have no money at the end of the year, wait until the following year.

Teachers do not receive salary, and are occasionally forced to make donations by the competent authorities, plus an assessment fee is deducted every month...

Eventually, I had to do a side job to support myself.

Lou Nannan's parents raised five cows.

Teacher Yuhong class cultivates seven acres of land.

Physics teacher, runs this repair shop in his spare time.

Fortunately, as we enter the new century, teachers' salaries have improved slightly.

At least the salaries of teachers in Huangnigang have exceeded those in Gucheng County.

The physics teacher dug out a pile of drawings and put many tools into a snakeskin bag.

Everyone came to the toy factory together and walked into the idle workshop that Xu Fei often used.

Since there is no ‘laboratory’ module, you have to rely on yourself to analyze the finished product and make samples.

When Xu Fei was in Daze, apart from paying attention to overseas news, he spent the rest of his time studying 'analog circuits'.

Make it by hand while referring to the textbook, and use the basic production line to produce the required raw materials or semi-finished products.

include:

Copper wire, tin wire, silver wire, gold wire...

Aluminum cylinder, metal tantalum, polyester plastic material, ceramic film...

Carbonaceous particles, glaze insulation layer, glaze insulation paint...

These things are connected in series according to their functions, so there are wires, resistors, and capacitors.

To connect a small speaker, the higher the requirements, the more complicated the wiring.

If you add copper-clad laminates made of fiberglass cloth, copper foil, prepreg, chemicals...

Then arrange the circuits onto the 'panel', and you have a circuit board.

In order to make the circuit board, Xu Fei prepared a bunch of tools.

Hacksaw blade, fine sandpaper, quick-drying paint, small pen, small electric drill, knife, carbon paper, rubber water, ballpoint pen, ruler, compass...

In order to test the performance of the circuit board, a bunch of electrical equipment was purchased.

Fortunately, the computer that comes with the level 4 basic production line has a 'simulation circuit' function.

When designing a circuit, it can help simulate the overall effect without having to conduct experiments again and again.

At present, Xu Fei can use the four-level basic production line to make circuit boards the size of a 1 yuan coin, with a thickness of 1 mm and a line width and spacing of 1 mm. He can control the sound volume, switch between five types of lines, and turn on and off the power.

In addition, a three-layer circuit board of the same size was produced for controlling the turning on and off of lights.

For example: Arrange 200x200 mini light bulbs on a wooden board. Through this circuit board, you can generate 'Xu Fei', 'Director', and 'TEP', and you can even switch back and forth manually.

No matter how many fonts and functions we have, we can’t do it for the time being.

Because the more controls there are, the more complex the circuits and the larger the circuit board.

According to the book, the circuit board is called PCB, not an integrated circuit IC, nor a microcircuit chip.

Currently, the above items are transported to the idle production line along with the operating table.

Xu Fei introduced his masterpieces to everyone one by one.

Lou's father and Yuhong's class teacher were very surprised, "Are you so busy when you are a factory director?"

The physics teacher asked curiously, "Why not find a manufacturer to customize? Or recruit a group of electrical engineers to help your company design the PCB you want, or even develop EDA, design IC, and microcircuit?"

"TEP does not support this project, I plan to do it myself."

"Then you are now basically at...the level of the 1930s."

"How many?"

"The July 7th Incident."

"Did it start so early abroad?"

"Nowadays, they are all 'printed boards', that is, green circuit boards. Plug-in PCBs have been eliminated ten years ago. Moreover, printing technology has also changed from flat packaging to ball array packaging, and high-end

Density direction development.”

"Hey, I just want to control the sound, why is it so complicated?"

"Right."

The physics teacher sat at the operating table and after learning about the many raw materials, "Let's start with the small speaker first?"

"I'll watch you make it. If you need anything, just ask."

"No, let's talk about your requirements first, what kind of timbre you need."

Xu Fei took out Zhang Fei's undeveloped product from the cabinet, "His."

"Mechanical Zhang Fei?" The physics teacher seemed to know about this toy and nodded, "Does it have a metal film?"

"Which material?"

"The higher the hardness, the better."

"Phosphor bronze?"

"I've never heard of it. It's best to use a titanium diaphragm... In this way, I'll list the corresponding materials and you can see what you can prepare."

Half an hour later.

The physics teacher first made the voice coil, then fixed the magnet, and then set up the front pole piece, the rear pole piece, and the centering support piece.

Then, based on Lou’s father’s suggestion, we studied the ‘suspended edge’ to provide damping so that after the signal disappears, the sound radiation can be quickly eliminated to ensure high sound quality.

Then the diaphragm, dust cover...

"In general, this is a moving coil type monomer, which is slightly more complicated than the electromagnetic type you made. The principle is that the output signal from the recording interface will activate the current of the amplifier, and the positive and negative charges of the current will cause the monomer to

The coil generates a magnetic field reaction. The ++ repulsive diaphragm retracts inward, and the +- diaphragm expands outward, contracting and expanding to form sound."

Xu Fei imitated and made one, and quickly got the hint from the base.

[Titanium alloy speaker-subwoofer]

View parameters:

Distortion, signal-to-noise ratio, frequency response, dynamic range, linear characteristics, stereo separation, direct sound, reflected sound, reverberation sound, reference oscillation, auditory characteristics...

If the previous small speaker was 1, it has now reached 99.

At the same time, the physics teacher and Lou's father worked together to improve the video recorder, design and adjust it to match the circuit diagram of the sound produced by "Mechanical Zhang Fei".

Another half hour later.

Four gentlemen installed batteries, speakers, players, and circuit boards for Zhang Fei.

Xu Fei turned the winding, and the power supply was now activated. If the power of the clockwork was exhausted, the power supply would be automatically turned off.

“With a teacher’s help, I can get twice the result with half the effort.”

Then, put down Zhang Fei.

"Wow, yeah, yeah~~"

Mechanical Zhang Fei held the Zhangba Snake Spear in his right hand, clenched his fist with his left hand, struck a pose, and charged forward with the weapon in hand.

The sound is like Optimus Prime, full of heavy metal texture and with a little echo.

It does seem to have more selling points than the silent version.

However, the Yuhong class teacher frowned slightly, "This is like singing an opera, and it doesn't reflect Zhang Fei's fierceness."

Father Lou nodded, "It should be full of murderous intent. He is an enemy of ten thousand people. He is much more fierce than Guan Yu."

The Yuhong class teacher, who was over sixty years old, thought for a moment, his eyes lit up, he picked up the recorder and lowered his throat:

"I'll kill, I'll kill, I'll kill, kill, kill~~hahahaha!"

The dull and hoarse voice echoed in the workshop.

Xu Fei was startled and had goosebumps all over his body.
To be continued...