Traveling Through 58 and 60, the System Is Coming

What did you write? It's good. Erliuzi went to report it. The commune supported the lazy Erliuzi as village cadres and confiscated all the protagonist's inventions. Po deliberately fed a lot of stuff. The protagonist may not care, but we were fed history and left to scatter.

When roads are blocked by heavy snow in winter, can we still dig reservoirs, build brick kilns, burn bricks, dig foundations and build houses?

Is this book written by a level 5 author? ? Just over 100,000 words of teleportation arrays have been released. They are system, cultivation, system space, and extraordinary. They want a few of them, but they are useless and they feel useless! Got it!

The subject matter is good, but there are a lot of problems. In winter, it snows at the beginning. In this weather, the ground is as frozen as rocks. How to dig? It is impossible to dig and move by manpower alone. Moreover, it was too deliberate for the protagonist to take off his clothes and expose his abs and chest. This is winter, so even if the protagonist is not afraid of the cold, he can't show it.

Whimsical is not enough to describe it.

There is no problem in planning to burn bricks, but using firewood is a bit inappropriate. Once the fire is started, it will take days and nights without stopping. There will definitely be no supply of firewood, so the only choice is to use briquettes. I am from a rural area in Hunan. In the past, our village used to bake bricks by itself. It was not a brick kiln, but a circular brick-fired brick more than ten meters high.

How did this account reach level 5? Did I buy it?

Good looking, please read "Chen Shang Sword Journey"!

This thing is so big in modern times that it can easily defeat aliens.

Even if you are an immortal, your lifespan is still 61. This is a fake immortal.

Measurement and limitations of the sound volume of a passive ore machine (which uses no electricity at all) using a ceramic piezoelectric piece 1. A bare piezoelectric piece (small buzzer chip, 20~35mm) is directly connected to the ore machine 1. Natural impedance mismatch: the piezoelectric piece is a capacitive load, has extremely high equivalent impedance, and consumes almost no current but only voltage. However, the detection output of the ore machine is a weak audio current (microampere level) and lacks a DC leakage circuit. 2. Actual volume: - Strong local station: You can barely hear it clearly when you put your ear close to the piezoelectric film. It is very weak when it is 5 centimeters away, completely unable to reach the level of an external speaker; - Weak signal from a distant station: basically only rustling, and the human voice is blurred; - Sound quality: extremely sharp, lack of bass, only mid-to-high frequencies. 3. The maximum sound pressure of the bare chip: only about 60 to 70 decibels (on-ear), which is far inferior to 2000Ω military high-impedance headphones. 2. Two modification methods can greatly increase the volume (still passive, without adding batteries) 1. Make a resonance cavity for the piezoelectric piece (the most critical) Stick the piezoelectric piece on a large paper cone, a hard plastic pot, a round wooden board, or a large plastic pot lid, and use the paper cone to push the air: - Ordinary 35mm piezoelectric piece + 15cm paper cone: The volume is about doubled, and the local strong station broadcast can be barely heard within 1 meter, similar to the small sound file of the old cable small broadcast; - Larger resonance cone (A4 size foam board/wooden board): The sound pressure is further increased, and it can be vaguely heard two to three meters away, but the bass is still poor and the sound is thin. 2. Add an impedance matching output transformer (T725 audio transformer, passive) The ore machine detection output is connected to the high-impedance side of the transformer (1.5K~40k tap), the piezoelectric piece is connected to the 10k/20k secondary, and a 10k~100k bleeder resistor must be connected in parallel at both ends of the piezoelectric piece (to solve the problem of muffled and smaller sounds caused by the inability of the capacitor to discharge). - After good matching: the volume can catch up to half the level of the old reed speaker. The local strong station can be played in a small area and can be heard in the room within a few meters; - If connected directly without a transformer, even if the resonance basin is made larger, the volume will be much smaller. 3. Upper limit ceiling (a limit that passive sources cannot break through) 1. The total energy of the mineral machine comes from radio waves in the air, and the power is only at the nanowatt to microwatt level, so it is impossible to drive ordinary dynamic speakers; 2. Even with optimal matching and a large resonant basin, it cannot achieve the volume of ordinary active small speakers. It can only achieve "close listening" and cannot achieve loud playback in the whole house; 3. Don't expect passive piezoelectric sheets to achieve high-volume bass. The piezoelectric structure inherently lacks low frequencies, so human voices can be heard clearly, but music is difficult to hear. 4. The simplest and most practical connection method (passive available) Diode output → high-voltage end of T725 transformer → connect the low-voltage end of the transformer to a piezoelectric ceramic piece → connect both ends of the piezoelectric with a 22k resistor → the piezoelectric is glued to the paper cone resonance cavity. Would you like me to give you a simple passive matching small circuit solution without buying a special transformer?