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  3. It seems not publicly available. I couldn't locate it.
  4. Hello I need the datasheet for CD3301RHHR power chip . thanks alot
  5. Have you used ADS8684, according to the circuit connected to the data sheet, use the internal reference power supply, also the circuit connected to the internal reference power supply circuit, /refSEL pin ground, but the REFIO pin has no voltage output, the value is 0, what is the reason what?
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  7. YouTube: https://youtu.be/AJvhhS8I3Ps Features: Identify a fake Lithium-Ion/Lithium-Polymer/NiCd/NiMH battery Adjustable constant current load (can also be modified by the user) Capable of measuring the capacity of almost any kind of battery (below 5V) Easy to solder, build, and use, even for beginners (all components are Dip) An LCD user interface Specifications: Board Supply: 7V to 9V(Max) Battery Input: 0-5V(max) – no reverse polarity Constant Current Load: 37mA to 540mA(max) – 16 Steps – can be modified by the user The true measurement of a battery’s capacity is essential for many scenarios. A capacity measurement device can solve the problem of spotting fake batteries as well. Nowadays fake Lithium and NiMH batteries are everywhere which don’t handle their advertised capacities. Sometimes it is difficult to distinguish between a real and a fake battery. This problem exists in the spare batteries market, such as cell phone batteries. Furthermore, in many scenarios, it is essential to determine the capacity of a second-hand battery (for instance a laptop battery). In this article, we will learn to build a battery capacity measurement circuit using the famous Arduino-Nano board. I’ve designed the PCB board for dip components. So even beginners can solder and use the device. References Article source: https://www.pcbway.com/blog/technology/Battery_capacity_measurement_using_Arduino.html [1]: https://www.onsemi.com/pub/Collateral/LM358-D.PDF [2]: https://componentsearchengine.com/part.php?partID=671517 [3]: https://componentsearchengine.com/part.php?partID=617283 [4]: https://componentsearchengine.com/part.php?partID=368895 [5]: https://www.samacsys.com/altium-designer-library-instructions
  8. How is the current generated? The current is generated because of the positive and negative charges. The electrons are inside the metal conductor and actually flow from the negative electrode to the positive electrode. It can be imagined that there is a positive charge on the positive side of the power supply. Inside the metal conductor, the nucleus has little force on the electrons, and the electrons are easily separated from the nucleus. So the electrons in the metal conductor close to the positive electrode of the power source are first attracted by the positive charge of the positive electrode of the power source. In the past, the metal conductor that is close to the positive pole of the power supply loses electrons, and it becomes a positive charge itself. The free electrons of the metal conductor that follows it are attracted by this positive charge, and thus the current is formed. If the nucleus of a certain metal has a strong attraction to electrons, then the electrons move hard, which can be understood as "resistance is large". If the nucleus has a weak attraction to electrons, then the electrons move easily. Kind of situation can be understood as "small resistance" In fact, when the free electrons move in a direction, they will collide with the atoms on the crystal lattice. According to the classical conductivity theory of metal, the free electrons collide with the positive ions on the lattice, and the electron motion is hindered to generate resistance. The collision frequency is about 1015 times per second. In the microcosm, it is not advisable to understand with simple particles. In the atomic model, electrons outside the core are distributed according to certain rules. According to the principle of uncertainty, it is impossible to judge the position of the electron at the moment. Only the region where the electron is distributed has a probability distribution. The distribution map of the electron is called an electron cloud. The state of the electron can only be known through the electronic cloud. When an atom is excited by the outside world, the electrons will break away from the control of the nucleus and become free electrons. But the electrons will soon release the excited energy and then return to the electron cloud. Because the number of atoms in a conductor is a huge astronomical number, and the atom is in a state of being excited by heat, statistically, because the number of atoms in the conductor is huge, the number of free electrons is of course huge, so that the whole The conductor looks like a sponge filled with free electrons. From the perspective of energy, the electrons in the electron cloud are controlled by the nucleus, as if they are locked into a dense space. While the energy of free electrons is relatively high, it can move relatively freely. The energy relationship of the former can be called the forbidden band, and the latter is called the conduction band. The electrons move and return between the forbidden band and the conduction band. The function of the power supply is to establish an electric field that acts on the free electrons that satisfy the condition, causing it to move in an directional motion. Electrons are accompanied by excitation and return during motion, which is part of the resistance. Therefore, electrons can't actually be compared with ordinary physical particles. The two are actually different. Of course, you can understand it simply by particle model. The excitation of an atom involves the thermal motion of the atom, so the amount of free electrons is naturally closely related to the temperature of the material, as the resistivity increases with temperature. More articles about resistance and current, visit: Kynix semiconductor electronic blog
  9. Hi there! I am looking for a datalogging device that is small (Arduino Uno/ Nano size), automotive grade, and can store PWM input into a microSD card. I am trying to read and store PWM data from a fuel level sensor. Does anyone have any ideas? Any help would be greatly appreciated!
  10. Hi... a light dimmer like that, which switches power on part way through each half cycle, can only work well with a direct filament lamp load. To dim any other type of lamp, a different circuit has to be used where the power is on from the zero crossing of the AC supply and turned off at some point through each half cycle.
  11. According to the datasheet you can calculate the series resistance R1 using the formula below. This way you can use your desired voltage on the input. I don' t think you need to alter any other component.
  12. I plan to build an engine speed controller, but in my city 127 volt power is provided. http://www.electronics-lab.com/project/ac-motor-speed-controller-using-u2008b/ Is it possible to modify this project to 127 volts version? This project would suit me perfectly! Thankful!
  13. More information about the power supply you can see from here https://www.allicdata.com/product/Relays/Power-Relays-Over-2-Amps/2963750/11507.html
  14. Maybe you can try to apply a sponsorship for your project. I'm not afficiate with ALLPCB but I heard that they have a good program of Educational & Engineering PCB Sponsorship. They have always encouraged student engineers and professions around the world to innovate. You also can visit https://www.allpcb.com/sponsor.html to learn more.
  15. Now, I am considering about to do a new project, and this project will according to a WIFI transmitter. So now, I am considering about is it better to buy a circuit board then a DIY? After all,it is too hard for a school student to afford it if they are expensive. What are you use if you need some boards? Diy one or buy one. Feel free to leave a comment, cause I don't know how much it will cost if I bought some PCBs.
  16. Hey @electricman!! If you need some help to learn electricity. There are numerous options available on the internet like online courses, tutorials and so on. I also found an informative link: https://www.pannam.com/blog/free-resources-to-learn-electrical-engineering/ for you where you can learn various courses online at free of cost.
  17. Use a separate +5V supply to power the voltage meter and current meter. Connect the grounds of both meters to the (-) output of the power supply being measured. The current meter can measure the negative voltage across the 0.47 ohms R7 of the power supply being measured, then the current meter does not produce an additional voltage drop that ruins the good voltage regulation. R7 produces a voltage of 1.41V for 3A or 0.47V for 1A. You will need to make a voltage divider to reduce the 0.47V to 0.1V for the input of the current meter. Disconnect the (-) segment of the current meter display.
  18. Hi, did u got any solution for your problem coz I'm also facing same thing. Thanks
  19. Could you tell me why I need to panelize my boards when PCB manufacturing?
  20. A tab route is used to create arrays, often called "route and retain". Tab routing lets you place more than one board (of either the same or different design) into a given area. This is typically for the convenience of the customer or for assembly requirements that utilize pick and place machines to load components. PCBs are then separated by breaking or cutting the tabs.
  21. Hello everyone, What is tab route in PCB manufacturing?
  22. I'm in a joint program for computer and electronics engineering. Although I had another year to finish my first year and sign a project, I was hoping maybe I could get some ideas from some of you. I'm not looking for simple circuits, I'm not looking for anything too complex. When it is time to start the project, I will have only 3 months to investigate, build, test and finalize the project. We like https://copycrafter.net/economics-homework-help.html for him. Any help for something great to do the idea would be very helpful. I had a lot of ideas, but it wasn't financially possible after doing research. I have a spending limit of $ 300- $ 500. Thank you very much for any idea, and if I like to follow an idea, I will let you know in writing.
  23. Hello everyone, I got a suggested simple NPN circuit that worked fine with the 1.2V trigger signal. Here it is Thanks everyone.
  24. Your simulation is cheating because it uses a very high base voltage that has almost unlimited current and no voltage drop.
  25. Lets see if this is readable. Using a 2n2222 - about 10 cents apiece. Current from the source is 40ma with a base resistor of 1000 or 10k. In the view the yellow trace is the current through the relay; scale on the right . Green is the voltage at the base; scale on the left. I have no idea what the inductance would be so I set it at 0.001 henry.
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