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  1. J

    Practical use of voltage divider

    hello, I am stuck with a dilemma which might or might not have a simple solution. more: giá chung cư 17 phạm hùng I have a psu supplying 46Vdc unofrtunately i need to step this down to several different voltages. 1) 14 to 20Vdc (best would be 16Vdc) to power a micro mainboard power supply...
  2. J

    Scooter motor to power wood lathe

    Hi! I'm new here so if this topic has already been covered or if it's in the wrong category, be gentle. more: can ho 17 pham hung I know enough about electronics to make me dangerous. I have a wood lathe and want to power it with a DC motor to be able to get better speed control. I have seen...
  3. J

    In need of lighting (power) guidance

    Hello all, I've arrived here after what feels like hours of scouring the web for the info I'm after but I feel like I'm just not getting the search terms right or something. So here I am, first time poster hoping for some guidance to what I think should be a simple question? more: dự án iris...
  4. J

    Will the USB 3.0 cables get too hot?

    Hello! This is my first electronic question. The image I have attached should be self-explanatory for a better understanding of my project. However, I need to know do I have to add any additional cable? more: iris garden trần hữu dực I am going to utilize 3 lap top computers (A, B, & C)...
  5. J

    150W LED streetlight....why dont they use the streetlight superstructure as heatsink?

    Hello, The following below document (RDR-32) is for a 150W PFC’d LED streetlight. Its noticeable that the schematic on page 8 simply shows the earth connection being simply connected directly to the neutral. Surely this is not wise as RCD’s could be tripped? more: mỹ đình plaza 2 Surely for...
  6. J

    Loud music from over-the-fence is causing offence...

    After recently becoming somewhat broke, my wife and I were forced to settle in a small town in a very Wild-Westy part of New Zealand: Deepest darkest Southland. Like many of the inhabitants of this hillbilliyish community, our hard-smoking, hard-drinking, benefit-frauding 'neighbours' on the...
  7. J

    Sort of baffling what happened after a thunderstorm

    hi would anyone know the answer to this . During a thunderstorm my girlfriend had breaker for the outlet for use near the sink OK the power surge tripped the breaker in the bathroom . She has a leaded glass night light that she puts there if nothing else is being used it has a switch on it ...
  8. J

    Popped SMD resistor, need advice for repair

    Ill limit you with the boring details, but I have an electronic device that I can attach to my bike tire and it produces power and in return it can apply resistance to my wheel to simulate a steep hill or I must produce a certain number of watts. Its a great tool for training.... mehr: chung cư...
  9. J

    Why to calibrate strain gauges

    Hi, I need to measure the strain in concrete beams. For this purpose I have purchased data acquisition system with a complementary 1/4 whetstone bridge circuit. The complementary circuit consists of 3 resistors of 120 ohm each. My strain gauge is 120 ohm and the gauge factor (k) is 2.11. The...
  10. J

    Copper Clad Aluminum vs Oxygen Free Copper use, trade off, voltage drop in DC circuits

    Hello all, I am sure many have seen the debates on the internet by the car audio guys of the cheaper CCA wires vs pure copper wires when used to deliver high amp DC current. I am here to ask your opinion based on my situation. I have a 300w solar array, 400ah of 12v batteries, and a 50ft...
  11. J

    Bad quality breadboard?

    Hello! I recently got an Off-brand arduino kit as my first taste of electronics. It came with the board, components like LEDs resisters, breadboard, jumper wires etc... the problem is that when I try to plug some things into the breadboard, it rarely works. I struggle to plug anything in and...
  12. J

    Power Supply from ViewSonic PC Monitor

    Hi All My ViewSonic monitor quit working and I know it is many times a capacitor issue and in the ViewSonic case, in the power supply unit. I pulled the power supply and I can see various locations where capacitors/other components leaked. I posted a picture of what I found and have a few...
  13. J

    Light switch does not seem to work, only 60V measured at the switch

    I just bought a new house. On one wall in the kitchen is panel with 3 switches. I have know what 2 of the switches do (both are ceiling lights), but the third one does not seem to do anything at all. My first thought was that it controlled one of the outlets in the kitchen or family room right...
  14. J

    Harman Kardon AVR 147, Relay doesn't switch on.

    Hello, Yesterday I was watching a movie, and my HK AVR 147 just stopped working, and I could heard the relay switching off. I turn off the amplifier, and turn it on after 2 minutes, and it started to work for about a couple of seconds, and stopped again (again with a relay noise). Now, it...
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