electrical engineering

  1. K

    SMD Capacitor selection

    Hello everyone, How can we calculate the voltage rating of an SMD ceramic capacitor. Is it dependent on the package size?.
  2. maitrey

    Design Reference Sources (NFPA, NEC Codes & Standards)

    Hello All, I am a young professional electrical engineer who has just started working in Automation field. We build customized panels including PLCs, HMIs, Pushbuttons, Lights, Relays etc., I have been searching for a reference codes and standards that can be helpful for designing and wiring...
  3. maitrey

    Software to develop electrical wiring diagrams (Training)

    Hello Everyone, I am a young professional who has just started working in automation Industry as an electrical engineer and looking for a light scale software to develop electrical wiring diagrams for automation projects. My circuits mainly consists of PLC, HMI, IOs, E-Stop, Switches, Sensors...
  4. T

    Circuit Analysis

    For Question 2.1, is the power 500W or 100W ? Do we need to apply the passive sign convention rule for power in whatever cases? Also, i’ve Learnt that we can check answers by balancing power in a circuit. But the power in this kind of circuits don’t balance out, but it is still valid. So when...
  5. A

    Touching live wires on high voltage line.

    Hey everyone :) I'm working as an automation engineer and I've always asked myself why people say, that for example birds, can sit on power-lines, because they aren't touching neutral/different potential and no current is flowing. I can't really get this explanation into my head, because...
  6. R

    Do we select a large or small BJT to amplify high frequency response?

    Part of me thinks we need a smaller BJT, to reduce base emitter junction area. but I am confused
  7. J

    LTspice Error: Undefined symbol in: "<<voltage>>" on mac.

    Hey y'all! Hope you're having a great day! I've spent an unnecessary amount of time trying to resolve this issue. I'm pretty new to LTspice and I wanna simply change the x-axis to show voltage instead of time, but it just doesn't seem to work (I'm running the program on mac). As you can see in...
  8. maitrey

    Transfer 24 VDC to 1000 ft...

    Hello, I have to transfer 24 VDC to 21 devices which is 1000 ft apart. Is it possible to transfer 24 VDC to such a long distance? This 24 VDC is coming from SMPS. Does the current/power rating matter in this case? And how can I calculate total voltage drop at the end (If there is any)?. All...
  9. maitrey

    Communication Protocols :- DeviceNET, Profibus-DP and Profinet

    Hello, I am designing an automation solution where I have 40 Electrical valve acuators to connect my PLC. I am considering two types of actuators with different communication technology. Solution 1: Modbus TCP/IP Solution 2: DeviceNET, Profibus DP and Profinet (Not quite familiar with this)...
  10. maitrey

    Design Interlock for two operations (Manual Switch and Automatic Switch)

    Hello, I am in the process of designing an interlock for two operations. 1. Operated by Manual Switch 2. Remotely through an Automatic Switch (Can't be controlled Manually) If user turns manual switch then operation should start. (In this case, if someone activates automatic switch it should...
  11. G

    Project Ideas

    Hello! I am a computer science and AI student, but I am getting into hardware. Over the last few weeks, I have become rather adept at designing circuits and PCBs (I might have audited a couple of courses but that doesn't matter... right?). I have designed my own version of a maker board --...
  12. Neophyte_2.0

    balanced delta connected voltage source with negative sequence and an unbalanced wye connected load (with neutral line)

    So given is that you have a balanced delta connected voltage source with negative sequence and an unbalanced wye connected load (with neutral line). Al the loads are given , the neutral current is given and the first phase voltage of the soure as Vp=Vm<10°. Asked: Ia,Ib and Ic and the Power...
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