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  2. The Environmental Protection Agency website says that in 2014, over 720 million new electronic products were sold and 3.36 million tons of used electronics were ready for end-of-life management in the U.S. Economic Forum report said e-waste is the fastest-growing waste stream in the world, reaching 50 million tons the year before. Globally, society only deals with 20% of e-waste appropriately, and there is little data on what happens to the rest, which for the most part ends up in landfill, or is disposed of by informal workers in poor conditions. Electronics recycling laws are a stat
  3. Today
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  5. RF stands for Radio Frequency. It is implemented and used to compose any devices that are designed to operate on radio-frequency. This technology is implemented in any device that is capable of a sending or receiving radio waves such as mobile phones, and Wi-Fi networks. I know there are many varieties of RF Circuit Design Books available in the market for one to learn Circuit Design for both beginners and advanced learners. But the most popular one or the one that has the largest number of users in my country is Secrets of RF Circuit Design for beginners and advanced learners by a noted
  6. Yesterday
  7. Hello, New to the site, just joined. I am looking for any information that any of you might have of the Cherokee International SP671-Y01A model SMPS. This one is for 24V output. I am looking for schematics, User documents in regards to the circuit and the O/P enable pins designations. Any help is appreciated. Thanks Edwin
  8. By the way, an extremely useful and free tool can be downloaded from here: saturnpcb.com/pcb_toolkit It does require installation on the PC, and it groups many useful PCB calculators in one program. I have no connection to it, other than using it. enjoy
  9. Last week
  10. Hello everyone, In connection with the development of a program for Boolean minimization, think e.g. to Quine-McCluskey, I need examples and their correct solution so that I can check my program for correct operation. The number of variables may not exceed 20, and preferably between 4 and 10. The examples may be presented in this form (see the truth table below): X {A, B, C, D} = Σ {2,4,5,6,9,10,13,14}, with the solution: CD'+A'BC'+AC'D (C AND (NOT D) OR (NOT A) AND B AND (NOT C) OR A AND (NOT C) AND D). I would like to receive a response from you. Kind regards, Karel. i A B C D X 0
  11. Solder is in arguably one of the required building blocks for electronic assemblies, and every assembly in the world has it. Solder, has been around for over 5,000 years, by some accounts, and used for weapons, jewelry, and stained glass, among other items. In 2006, everything changed for the vast majority of contract manufacturers with the RoHS directive that effectively removed lead from the soldering process for all products to be built or imported into the EU Removing lead increased the amount of thermal energy required to melt the solder and create a good MIC. Removing lead
  12. Digital electronics is called the core of modern technology. It operates on the digital signal which makes it less noisy and highly efficient than analog circuitry. For this, all the new and more attractive modern gadgets are built upon a digital electronics module. Also, digital circuitries are easy to program and implement according to user choices. I know there are many varieties of Electronics Books available in the market for one to gain the skills necessary to develop and construct your own functioning gadgets for both beginners and advanced learners. But the most popular one or the
  13. Most of time when we use WiFi, we only use our WiFi device as a "station"(STA) that mainly receive information sent from "access point" (AP). Ameba Microcontroller from Realtek can not only connect to WiFI as a station, but also broadcast its own signal and become an AP, here is how, In AP mode, Ameba can accept at most 3 station connections, and can be set to open mode or security mode (WPA2). Preparation Ameba x 1 Example In this example, we turn on the AP mode of Ameba and connect station to Ameba. Open the WiFi AP example, "File"
  14. see: https://www.nteinc.com/semiconductors/ComplPr.php They list matched complementary pairs that maybe helpful like the NTE128/NTE129 at 80 volts and 1 ampere. And many others as well.
  15. Hello. Can someone kind enough please provide info about transistor substitute of BC807W and BC817W in TO92 package? They are not locally available but I was hoping a TO92 substitute would be. Will appreciate greatly any reply. Kind regards...
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  17. Protection of the global supply chain is important for high-tech companies Chinese companies need to avoid U.S. criticism and potential U.S. penalties, trade restrictions related to possible export control violations. As demonstrated, China will try to build their own industry by themselves. Over the past two decades, China welcomed multinational companies. But now in the coming years and decades, China will say no, it must be produced by Chinese. China makes about half of the world’s electric vehicles, and it will very likely continue to play a key role in the future. Six of the top-ten b
  18. Use Ameba As UDP Server When surfing on internet, most of us are using TCP as its reliable and secure, however, UDP could also shine in some other area where speed is more important than integrity, and here is how Realtek's Ameba RTL8722 WiFi+BLE microcontroller works with UDP, Preparation Ameba x 1 Example In this example, we connect Ameba to WiFi an
  19. Earlier
  20. There is an article "Design Project2 - BCD Calculator" that maybe helpful. http://homepages.cae.wisc.edu/~ece352/fall02/old_project/p2.pdf
  21. BCD calculator with two input(A,B).. do (add,subtraction, multiplication, division at a time) using proteous anyone?
  22. In this example, use the Ameba RTL8722 module connects to a Waveshare 2.9inch e-Paper module to display a few QR codes. The display uses the flexible substrate as a base plate, with an interface and a reference system design. Firstly, you need to prepare a picture/photo in the format of 296×128 pixels. It is easy to find a photo resizing tool online and download the generated image in JPG format. Then link all hardware and upload code in to the hardware. Upon successfully upload the sample code and press the reset button, you need to wait for around 1~2 seconds for the e-Paper module to
  23. Sounds like you are already on your way 😀 Regarding schematics, some very well known mics have their schematics published, for example you can google "neumann u87 schematic" or "schoeps microphones schematic". The information is there.. I wish you much success with your efforts. Guy
  24. E-ink display comes in very handy in cutting power consumption when not refreshing the screen, it becomes more power conserving when combined with ARM Cortex M33 microcontroller-- RTL8722 from Realtek. This microcontroller sports dual-band WiFI and BLE 5.0 withh max clock at 200MHz, which make it possible to parse long string of a URL and generate a QR code locally. In this demo, we will show how to generate QR code and display it on a E-ink display. https://youtu.be/KYI5WBmC6ac
  25. Hey Guy and Harry, Honestly that's the direction I'm going, "A full time profession" I will take your suggestions about Dynamic microphones, and yes Ribbons are quite easy since I have already assembled the matching pair of RM-6's that I have, But my main goal is to be able to repair my Bluebird mic and my Cascade Elroy. Replacing Diaphragms is easy I've already replaced two diaphragms on my Cascade M179's. I absolutely need to learn how to do this and I'm not stopping until I do. My end goal is to eventually be the top and only microphone repair shop in Ecuador. I will look at Hunte
  26. It looks very nice, I also like the layout and the fact you used polygon pours on both sides. I think one improvement would be to make edge plating on the sides, it helps dissipate the heat off the main board. If you can add schematics to the post that would also be interesting to see. Thanks
  27. An H-Bridge (Full-Bridge) driver is quite popular in driving loads such as brushed DC motors and it is widely used in robotics and industry. The main advantages of using an H-Bridge driver are: high efficiency, rotation direction change, and braking the motor. In this article/video, I have introduced a complete H-Bridge DC motor driver using four IR3205 power MOSFETs and two IR2104 MOSFET drivers. Theoretically, the above-mentioned MOSFET can handle currents up to 80A, however, in practice we can expect to get currents up to 40A if the MOSFET temperature is kept as low as possible, using a big
  28. Hi Peter. It's quite a difficult question to answer, since building microphones can be a full time profession. I'd start with the dynamic microphones first, in these there is usually not much electronics inside - there is the transducer and usually a transformer. So with good hands and a good soldering iron you can probably fix the microphones, i.e if there are loose connections or just swap in replacement parts. Ribbons are also simple in their internals. usually just a thin corrugated foil surrounded by magnets and a transformer. Here also you can fix but you need to be very care
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