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  1. J

    Where does this voltage come from?

    Hello guys, I had a quick question about one of the exercises of my electronics book. Step #1 says that I should do: (5 - 0.7)/(10 + 101 * 1) = 0.039 mA However, I can't seem to find where the 0.7V comes from. I simulated the circuit in Multisim and i'm measuring the voltages everywhere...
  2. J

    Simple program in assembly using Tiva C launchpad?

    Hey guys! I just got a new Tiva C MCU. It's architecture is ARM, and I have no experience programming in assembly using said architecture. To start, I'm trying to run a simple program that puts a value in a register. In an MSP430, the project I'm trying to do would look something like this...
  3. J

    Are these courses worth it?

    Hey guys, I'm an undergrad in computer engineering. This past summer I worked as a research assistant in the robotics GRASP Lab at the University of Pennsylvania. This experience with robots has driven an interest in me in Control Systems (a class that computer engineers don't usually take)...
  4. J

    Benefits of learning about networking?

    Hey guys! I'm taking a course this semester on Networking Fundamentals. Our professor has given us the opportunity to be able to take tests by Cisco to become CCNA certified for free. I don't know much about networking yet, so I was wondering how much of a big deal it is to be a CCNA...
  5. J

    Simple Seven Segment Counter Project Help?

    Hello Guys, I am trying to do a simple digital electronics project where I put two seven segment displays and once I connect the voltage source, the displays start counting automatically from 00 to 99. Here is a video of exactly what I want to do: My group and I found the attached...
  6. J

    Simulating a NAND/AND gate in Emitter Coupled Logic?

    Homework Statement I need to simulate a AND/NAND gate with Emitter Coupled Logic. As i'm sure that most of you know, ECL is mostly used to make OR/NOR gates, so finding out how to make a NAND/AND gate is not as easy as it sounds. Homework Equations The Attempt at a Solution I...
  7. J

    Voltage Transfer Characteristic in Multisim?

    Homework Statement Hey guys. I am trying to calculate the Voltage Transfer Characteristic (VTC i.e. Vout vs. Vin) of a simulated circuit in Multisim but for some reason it doesn't appear to be working. I pressed Simulate --> Analyses ---> DC Sweep --> Selected the input pulsed voltage as...
  8. J

    Value of Vout in PMOS Inverter?

    Hey guys. I am simply trying to derive the equation for Vout in a PMOS inverter (attached). I know that in an NMOS inverter (which has the resistor in top of the transistor instead of the bottom) the equation for Vout is: Vdd - id*rd. But how does the resistor being in the bottom change...
  9. J

    How to design an XOR with these gates?

    I need to design an XOR with 2 NANDS, 1 NOR, and 3 inverters. Is it possible? I can't seem to find how to do it now.
  10. J

    Designing an XOR gate

    Homework Statement Design a 2-input XOR with the following specifications: RL = 1KΩ VDD = 1.8V VOL = 0.1V VOH = 1.7V Homework Equations Triode: Id = μnCox W/L VDS (VGS - Vt - VDS/2) Cutoff: Id = 0. The Attempt at a Solution Searching on my book I found the image...
  11. J

    Good PDF Merger program or site?

    Hey guys. I need to merge about 7 PDF's but a few of them are about 80MB in size. I've tried a few good PDF pages from around the web but they all seem to have about 50MB in limit. Could anyone suggest me a good program that has no limitations to size of PDF's? Preferably free but if not...
  12. J

    How to find W/L?

    How to find W/L?? Homework Statement The exercise already tells me that the value of W/L is 2. However, I can't seem to understand where that result came from. I'd like to know how I can get to that conclusion. Here is the exercise with the graph of the inverter: Inverter image...
  13. J

    How does my book come to this conclusion?

    I'm starting my Digital Electronics course and I'm having trouble understanding how this example from my book gets to it's conclusion. It's about designing an inverter with certain specifications, but how do I find the value of W/L??? How do I get the 2 that the answer says? Here are the...
  14. J

    MATLAB Graph Piecewise Functions in MATLAB?

    Hey guys. I need to graph a piecewise function in MATLAB and I don't know how to do it. On top of that, it is also in radians: f(θ) = (80/∏2) θ, -∏/2 ≤ θ ≤ ∏/2 (80/∏) - (80/∏2) θ, ∏/2 ≤ θ ≤ 3∏/2 How do I graph it in MATLAB? And other than that, is there a way in MATLAB that I can take...
  15. J

    Converting periodic function from radians to time?

    Homework Statement Hey guys. So I have this homework exercise where I have to convert the following periodic function in radians into a periodic function in time. f(θ) = (80/∏2) θ, -∏/2 ≤ θ ≤ ∏/2 (80/∏) - (80/∏2) θ, ∏/2 ≤ θ ≤ 3∏/2 Homework Equations θ = ω0 t ω0 = 2∏/T...
  16. J

    How to measure the transfer function in Simulink?

    Let's say I simulate a simple filter in simulink and I want to see the transfer function graph (bode plot) of it. What do I do to get Vout/ Vin? I tried using the "PS Divide" Block and divide the output voltage and the input voltage, but that didn't work. Could anyone help me out here? This...
  17. J

    [Easy] What am I doing wrong here?

    Hey guys! Im new using Simulink. I was trying to simulate a circuit with an AC voltage source but the graph I get isn't anywhere near a sine wave. What do I need to put to the model to make it work?? Model: Graph I get...
  18. J

    Calculating Transfer Function off Bode Plot?

    Hey guys. I was wondering if anyone could give me some hints or help me understand well how to get transfer functions off bode plots. Here is an example I need to solve:
  19. J

    How do I see the gain from this Bode plot? (simple)

    This is the Bode plot of a Broadband Bandreject Op Amp amplifier. The exercise says this: I know that in order to get both cutoff frequencies I need to subtract 3 dB from the plot, but how do I get the gain? I would think that the gain is 3 dB because it is also the distance between the top of...
  20. J

    Simulink help?

    Hey guys. Im trying to simulate some circuits in MATLAB's Simulink, and I always get some weird graph which is not sinusoidal at all. I wanted to know if anyone could tell me which block am I missing if I want to get a good sinusoidal wave. Here are the pictures of the circuit and the graph...
  21. J

    Clapper circuit that actually works?

    Hey guys. I've been trying to make a simple clapper circuit that turns a LED on and off, obviously with a clap. I've tried countless models I have found online and none have seemed to work. Has anyone here used an online model that has actually worked for them? Could anyone give me the link...
  22. J

    Transfer Function Maximum?

    Hey guys. I'm doing some homework for my circuits class and was wondering if anyone could help me with this question. How do I determine the value of ω will the magnitude of H(jω) be maximum?? In my case, the magnitude of the transfer function is (R/L)/ [sqrt((R+RI)/L)2 + ω2)]
  23. J

    Simulation aborted because there are errors during netlisting

    I have built the following circuit: However, when I try to simulate it, I get an error that says "Simulation aborted because there are errors during netlisting. Please refer to the sessions log." What am I doing wrong? I'm new...
  24. J

    Simulating an OpAmp

    Homework Statement I need to simulate an OpAmp in Simulink but I can't seem to find an OpAmp block that works in SimPowerSystems, so I kept searching and found out sort of an equivalent. However, the simulation still gives me an error. I would highly appreciate if anyone could tell me what I...
  25. J

    How to simulate Op-Amp in MATLAB

    Good day. Could anyone tell me how to simulate an equivalent Operational Amplifier in Simulink? I read somewhere that I had to do it with 2 adders and a gain block, but I don't know how. Thanks.
  26. J

    Engineering How do I solve this circuit with Laplace transforms?

    I have this circuit which I need to solve using Laplace transforms. How would the KVL equations look? I am having trouble with them because of the mutual inductance. Thanks
  27. J

    Mutual Inductance dot convention?

    Could anyone give me a link that explains or simply explain to me how the dot convention on the mutual inductance works? For example, I'm trying to draw an equivalent circuit that converts the dots into voltage sources of this circuit...
  28. J

    Question about PSPice Student 9.1

    I downloaded PSPice student 9.1 and when I open the program and press File -> New -> Simulation Profile it doesnt allow me to put any name that I try to put. Also, underneath the name space it mentions something about "Inherit from an existing profile". What do I put there? Thank you all very much.
  29. J

    Where can I get a functional PSPice?

    I tried a special edition that came with an electronics book and it had lots of problems. Then I downloaded a 9.1 student version that I found online but when I try to open a new sim profile it doesn't allow me to put any name I want or import. And the Capture Student version that I have doesnt...
  30. J

    Power factor correction with two loads

    Homework Statement Vs = 480<0 rms. P1 105 W; pf1 0.7 lagging; P2 5 × 104 W; pf2 0.95 leading. Homework Equations S = sqrt(P^2 + Q^2), = Vrms* Irms(conjugate) The Attempt at a Solution I know how to...