Teaching steam electronic experimental science middle school electromagnetic gun

Type:Logic ICs
Condition:New
Package:Without battery
Color classification:Full set of spare parts (without batteries) finished products (without

Dear Buyer Friends: Although this product uses batteriespower supplyBut the internal working voltage can reach 160V. Assemble it.at leastNeed electrical knowledge and practical experience in senior high school physics curriculum, not suitable for junior high school and belowEducationPersons (age < 14) operated alone. If a person who does not have sufficient theoretical knowledge and operational skills blindly operates and tests with the equipment, the adverse consequences will be borne by himself.




Recommend friends with insufficient knowledge and experience to buyPrimary electromagnetic gun kitPlease click on the following link:item.taobao.com/item.htm?id=540102729417[Name of Commodity]Model_EML-M-STB1, Ver_1.0
[Characteristics]1. Using three commonly used batteries No. 5 to supply power, rated boost range 160V, the demonstration effect is strong;2. HavingDigital Voltage DisplayThe function can be used to study the relationship between voltage and projectile range.3. The electronic switch composed of high-power thyristor can only trigger thyristor, and the current is small, which solves the problem of arc ablation of mechanical switch through high current and prolongs its life greatly.4. Simple drainageprotection circuitIt can prevent excessive voltage of energy storage capacitor.
5. Unlike other common electromagnetic gun models, this product is equipped with a solid and durable plastic shell. It is not only beautiful, but also can effectively protect circuit components for easy demonstration. Through the transparent top cover, we can see the work of the internal components, and increase the producer's sense of achievement.Especially important is that the electromagnetic gun is an electronic device working at high voltage and high current. After putting the whole device into the insulated plastic shell,securitySex has been greatly improved.[Suite Content]
[Commodity Description]
1. The PCB is made of fiberglass, the measured thickness is about 1.5-1.6 mm, the green or butter white characters, the solder pad is sprayed with tin, and can be welded directly without grinding.
2. The circuit diagram of this page is for reference only. Please read the instructions for details.
3. The buyer's PCB may be slightly different from the sample in the picture, mainly due to the change of component position and circuit structure. This product has been revised n times from the trial sample to the products sold (mainly to modify the wiring of the circuit board) and is still being improved. Usually the minor version upgrade will not be re-photographed and uploaded, I hereby declare.
4. The core components of this kit, such as electrolytic capacitors, are generally Nihicon, NIPPON CHEMI-CON and Rubycon, which have reliable performance. The electrolytic capacitor in the picture is Black Diamond, and the package may be made of other two brands with good quality.
5. The number of micro-vulnerable components in the kit is more than the actual requirement, which can be used as a spare for occasional needs.
Six The shell is made of CNC for electrical engineering. As an engineering material, the color is not very white (gray is a little yellow). Its surface is not as smooth and delicate as that of mobile phone shell. There will be some scratches caused by processing. These scratches are not clearly visible to the light, and they will not affect the use of the shell. To shoot;
7. Instructions are printed by laser printers. Repeated rubbing of toner will gradually fall off. If the instructions are not clear or lost, you can ask for an electronic version from our shop.
8. This kit and finished products do not contain batteries. Players are invited to purchase batteries locally for use.
9. The tools needed for assembling this kit are: electric soldering iron, soldering tin, pliers, tweezers, scissors, screwdrivers, knives, multimeter, etc. Players are invited to purchase them from other online stores.[Illustration]




EML-M-STB1 Model Samples


Internal of EML-M-STB1 Model



The small yellow circuit board is the adapter board, which is used to lengthen the conductor, and also can effectively prevent the conductor from breaking.
(Only two pads on the adapter board are used in the figure. The player who is not afraid of trouble can also convert the wires on the switch through the adapter board, which can make the arrangement of the wires more beautiful.)



The bottom of the digital voltmeter is covered with patch elements. Players should not adjust the above adjustable elements casually to avoid worsening accuracy.





The circuit board adopts FR4 single-sided fiberglass board with symmetrical layout and is suitable for DIY.






The core components used in this product are brand products, and the parameter margin is large, so that its performance has a certain room for improvement.



The boost coil is made in our shop. Every one has been tested on the computer. It is shipped after the insulation is wrapped. It is beautiful and durable.



Matched projectiles are 4 carbon steel rods with nominal diameter of 4 mm and length of 12 mm. There will be some errors in actual size.

Circuit Diagram of EML-M-STB1 Intermediate Electromagnetic Gun (for Reference only)
[Update content]1..
[Installation Method]1. Read the package instructions carefully first.2. Weld the components on the circuit board according to the drawings, and pay attention to the polarity of some components lead, so that they can not be misfitted. After the welding is completed, it should be checked again and again.3. Install the components on the upper cover, weld the wires between these components and the circuit board, and connect the power cord. After completion, it is also necessary to check again and again.4. After checking correctly, put the circuit board into the shell and screw the screw properly. Put 3 alkaline batteries No. 5 into the cell, and pay attention to their polarity in accordance with the label on the circuit board. Close the top cover and screw the top cover screw.
[Method of Use]
1. Read the package instructions carefully first.
2. For finished products, first open the top cover and load 3 batteries, then close the top cover and screw the screw.3. The projectile (cylindrical magnet) is inserted from the rear of the barrel, and the tail of the projectile should be level with the tail of the barrel.4. Turn on the power switch, and the voltmeter digital light up and gradually increase. After waiting for about 30 seconds, the internal red light-emitting diode also lights up. At this time, the drain circuit starts and the voltage stops at about 170V. It will not rise again. The launching work is ready.5. Press the launching button, the projectile flies out of the barrel, and the launching process is completed.
[Other] 1. The device is a single-stage electromagnetic gun model with limited launching power. Compared with other multi-stage high-pressure electromagnetic guns sold in Taobao Store, the real significance of the device is to cultivate young people's interest in scientific knowledge and exercise their practical ability.Attempt to play with this deviceConfrontationHunting friends will be disappointed, please don't shoot!2. For logistics safety, this product does not provide batteries. Players are invited to purchase alkaline batteries No. 5 locally for use.
3. Players who are inexperienced in assembling electronic devices will not succeed in assembling them all at once for the following reasons:(1) Error in installation. Such as polarity and phase errors, including missing components;(2) Installation is not stable and reliable enough. Such as wire head without peeling, scraping paint, tin (welding plate), virtual welding;(3) Component leads are not properly trimmed and disorderly arranged, resulting in short circuit;(4) The component damage caused by excessive force and improper use during installation is relatively rare.4. The projectiles are common cylindrical carbon steel rods. Players can also use other magnetic materials such as steel balls as projectiles with similar effects.
The projectile for the kit is a cylindrical carbon steel rod with no pointed head, which can ensure safety.Each kit is equipped with 5 projectiles. Players should pay attention to recycling when using them. If you need more projectiles, you can buy 4 mm in diameter and 12 mm in length at Taobao.Carbon steel pinsIt can also purchase pins of other sizes for experiments.
Stainless steel materials can not be magnetized, can not be used as projectiles, it will not react to launch;
5. When using 3 1.5V batteries, the charging time is about 25 seconds. When the old voltage of the batteries used in the machine decreases, the charging speed will slow down. When the effect is too bad, the new batteries should be replaced in time.
6. It can be supplied with higher voltage (<7.5V)withIncrease the charging speed, but the maximum range will not increase. It can be loaded into two 14500 lithium batteries and one No. 5 battery occupying bucket, and the supply voltage is 3.7 *2=7.4V at this time.
7. As for the range of the electromagnetic gun, it is a complex subject, which is related to the size, mass, initial position of the projectile, discharge current and discharge curve, and even the shape and size of the launching coil have an effect on the range. Friends interested in studying this issue can visit Baidu or Kechuang Forum.
[Notes]
1. Keep in mind that all the circuit components should be loaded into the shell before power-on. It is not convenient to spread the exposed parts on the desktop or hold them in hand for direct power-on experiment. It is very easy to cause short circuit, leakage and electric shock accidents.

2. If the device is full of electricity (the red light is on) and the projectile is not fired in time, there will be 170V voltage in the device for a long time. At this time, it can not be disassembled and repaired by hand. answerAccording to the instructions, the energy storage capacitor should be discharged first and the charge should be removed before the research and treatment can be carried out.
3. After many rapid launches, the temperature of the transmitting coil will rise, which is a normal phenomenon caused by the high working current. It is suggested that the rapid launching should be suspended for 10 minutes after 20 launches and be cooled by itself.4. Although this product is not very powerful, but do not use it to target sensitive parts of the human body, as well as some very sensitive to the magnetic field of electrical emission.
[Q&A]QHow far can this electromagnetic gun fire?AThe launching distance of this device mainly depends on the launching angle. According to the parabolic formula of trajectory, the projectile has the longest range when it is launched at an angle of 45 degrees. Because the barrel of the device is less than 10 cm from the table top, the projectile will slide quickly after it is shot because of gravity, and the range in the air is more than 2 meters. If the muzzle is raised, the projectile will gain an upward velocity component, delay the landing time, and greatly increase the range. According to the test, the range can reach more than 4 meters when the launching angle is 30 degrees.

Ballistic Chart of Electromagnetic Gun

In addition, the initial position of the projectile in the barrel also significantly affects the range. After many experiments, it is shown that the best position for the device to put the projectile is to keep the tail of the projectile level with the end of the coil seat, and the range is the farthest under this condition. The tail of the barrel has been aligned with the end of the coil base at the time of manufacture, so as long as the tail of the projectile is level with the tail of the barrel. If you deviate from this position, the range will be significantly reduced. The reason for this phenomenon is that the magnetic field has the function of pushing and pulling back at the same time. At the optimum initial position, the pushing effect is far greater than pulling back, so the projectile can be launched. If the projectile is placed in the center of the coil, the push-back and pull-back action cancel out, the projectile will not move. Friends interested in exploring this phenomenon can search for relevant information on the Internet.

Q. Why is the barrel of the kit so short? Real cannon barrels are long!

A. The launching principle of the electromagnetic gun model is quite different from that of the real cannon. Weapon cannons are chemical cannons. Projectiles are accelerated by explosive gas in the barrel until they are separated from the barrel. However, the projectile of electromagnetic gun model only accelerates in the range of coil action, and the acceleration disappears rapidly after leaving the coil. This acceleration has nothing to do with the barrel. On the contrary, the friction between the barrel and the projectile decelerates the projectile, and the barrel decreases when the barrel is too long.

Q. The magnet projectile of the kit is only 4mm thick, and the inner diameter of the barrel is 6mm. Will it be more powerful if the thick magnet is replaced?A. Power depends on what aspect. In terms of range, the mass of large projectiles is also large, the acceleration obtained is small, and the initial velocity leaving the muzzle is low, which is the factor of power reduction. On the other hand, the large-mass projectile has a strong speed storage capacity, which can effectively overcome the air resistance, which is a factor of increasing power. In a word, for a launcher, all kinds of factors are mutually restrictive. To get the best combination, careful calculation and experiment are needed. Interested friends can try as much as they like.Q. How to improve the performance of the suite?A. This product uses a large margin of component parameters. It can speed up the step-up speed and voltage by increasing the supply voltage and replacing the regulator. The boost range of this boost circuit can actually reach more than 200 volts, but the storage capacitor can withstand the voltage by 200 V, so the voltage can not be raised too high. The specific method is to replace the regulator with 190V specifications, using two 14500 lithium batteries and a 14500 battery occupying bucket. At this time, the power supply voltage is 7.4V. According to this configuration, the launching effect can be significantly improved. If we want to get a higher voltage, we must replace the energy storage capacitor, and the cost of improving the voltage withstand value is higher, so it is not recommended.We should pay attention to the fact that the players can change the configuration of the suite to carry out the experiment. The consequences are not within the scope of the declaration of our store, and will increase the risk of component burning. This method is only for the reference of the powerful friends.