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  1. bertus

    Are You Happy As An EE?

    Hello, I am not an electrical engineer. I started at the firm I am working with repairing transmitters for NMR systems. Over the years the modules became to complex to repair onsite. Now they do exchange complete modules. I recently made a change in my career. I moved to an other department...
  2. bertus

    What type of AC power cord connection is this?

    Hello, The mains plug may also vary by country. The wiki has a nice page for that: https://en.wikipedia.org/wiki/Mains_electricity_by_country Bertus
  3. bertus

    What type of AC power cord connection is this?

    Hello, There is a IEC C5 plug on the end of the power cable, it connects into the IEC C6 connector of the power supply: Bertus
  4. bertus

    Buck Converter Efficiency

    Hello, The duty cycle does not tell all about the efficiency. The losses in the parts are not taken into account. The switching element (most times a mosfet) has a resistance. Also the used inductor will introduce losses. Bertus
  5. bertus

    Use of figures

    Hello, An other great site with a lot of information on capacitors can be found here: http://www.iequalscdvdt.com/ Bertus
  6. bertus

    battery ratings

    Hello, The following pages of the Battery University will give you a lot of info: BU-201: How does the Lead Acid Battery Work? BU-201a: Absorbent Glass Mat (AGM) BU-201b: Gel Lead Acid Battery BU-202: New Lead Acid Systems Bertus
  7. bertus

    Transistor BC547 blowing out

    Hello, @Niu_X_Tang , The used transistor is not a mosfet. The BC547 is a BJT, wich needs a base current to act as a switch. @simon mugo , Can you post a schematic, so we can see if the base current is enough to switch. Also, what current are you switching. The BC547 collector current is limited...
  8. bertus

    Electrical products

    Hello, Sorry, EE Power is a corporate enterprise and does its own evaluation of commercial products. Reviews and other forms of advertising are not allowed.
  9. bertus

    DC-DC Converter Topology

    Hello, 1kW is a lot of power. At 12 Volts it would mean a current of 83.33 Amp. At the input of 2.7 Volts it would mean a current of about 400 Amp. What would be in input source? How long would the 1 kW be mentained? Bertus
  10. bertus

    Rechargeable Lithium-Ion Batteries

    Hello, Have a look at this page: https://batteryuniversity.com/article/bu-409-charging-lithium-ion Take a close look at figure 3. Bertus
  11. bertus

    Which is the right forum for ...

    Hello, It depends of the nature of your questions. When you have some general electronic questions, you could have a look at our partner sites Electronics Point or All About Circuits. https://www.electronicspoint.com/forums/ https://forum.allaboutcircuits.com/ Bertus
  12. bertus

    Boost Converter Calculator Needed

    Hello, Have a look at the following pages: https://eepower.com/tools/dc-dc-circuit-calculator/ https://www.daycounter.com/Calculators/Switching-Converter-Calculator.phtml Bertus
  13. bertus

    Inductor Value

    Hello, What would be the application for the inductor? Coilcraft has a lot of application notes on inductors: https://www.coilcraft.com/en-us/resources/application-notes/ Bertus
  14. bertus

    Python

    Hello, I assume you mean the python programming language. https://en.wikipedia.org/wiki/Python_%28programming_language%29 The best site to download python is the origenal site of python: https://www.python.org/ It is likely also available in many linux distributions. Bertus
  15. bertus

    Power Bank Not Working

    Hello, Here is the datasheet. Bertus
  16. bertus

    Textbook

    Hello, Perhaps this ON booklet might help. Bertus
  17. bertus

    Magnetic Resonance

    Hello, It is more an electromagnetic field. Read this wiki page: https://en.wikipedia.org/wiki/Wireless_power_transfer Bertus
  18. bertus

    Looking for a Substitute

    Hello, Have a look here: https://alltransistors.com/transistor.php?transistor=24689 https://alltransistors.com/crsearch.php?mat=Si&struct=NPN&pc=11&ucb=70&uce=45&ueb=5&ic=3&tj=125&ft=60&hfe=40&caps=TO126 Bertus
  19. bertus

    250A Mosfet switch over 250A DC Contactor.

    Hello, For DC switching at that current, you could have a look at IGBT's. Here is an example: https://eu.mouser.com/ProductDetail/IXYS/IXYN140N120A4?qs=DuoOggApuK8kYa1Q9lrY2w%3D%3D Bertus
  20. bertus

    Strong Voltage Tolerance?

    Hello, It looks like the device has been discontinued: https://www.dynexproducts.com/pdp/DX-AC1200/9844789 The page does not state the tollerance of the voltage. What is the voltage when you put about 10 % of the maximum load (say 100 to 150 mA) on the output? You could also have a look at...
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