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Recent content by mastevano

  1. M

    convolution in matlab

    Thank you! That helped out a lot!!! Can I now just use CONV to do my convolution?
  2. M

    convolution in matlab

    Hello! I'm tryinig to write a simple convolution program in matlab, but i keep getting stuck! Basically, I'm trying to convolve two signals: 1) x(t)=3sin(50*pi*t) + sin(220*pi*t) sample at 250Hz from 0 to .3 sec 2) g(t)=150*e^(-112t)*sin(112t) sampled at 250Hz from 0 to .1 sec So, I know...
  3. M

    compact dis player - motor controller

    Hello Everyone! I am designing the motor controller for a portable compact disc player. I am having a difficult time determining what kind of motor is used in CD players. I believe it is either a Brushless DC or a Permanent Magnet type motor, but I don't know what size or any other...
  4. M

    Second-order time constant

    The load of the inductor is between 2-6 ohms and the inductance is about 10mH.
  5. M

    Second-order time constant

    Hi! Thanks for the response. I am actually using a smart highside power switch which can handle the high current. I also have a diode connection from the output to ground to protect the device from negative transients.
  6. M

    Second-order time constant

    Hello Everyone! How do you calculate a second-order time constant. I have the following circuit with two caps and two resistors. Initially, everything is connected (the switch is closed). Then the switch (which is actually a FET) is opened. I would like to determine how long it takes for...
  7. M

    Boost PFC real-world application

    mc34262 application Hi! I was just wondering if anyone knew what kind of power supply product a Boost Power Factor Correction circuit would be used for. In general, how do you know if a certin topology will work for your application?
  8. M

    DC/DC converter question

    Hi, I have a question regarding the output voltage calculations of a DC to DC boost converter. I understand how to calcuate the output if the input is a pure DC signal. In my application, I'll be using a diode bridge rectifier to convert my AC voltage to DC. This is the waveform that will be...
  9. M

    constrained optimization

    Look into the simplex method.
  10. M

    AC to DC Power Supply Design Project

    IanP - I was looking at circuits like that but I have to design it from scratch. What could I replace with the chip?
  11. M

    AC to DC Power Supply Design Project

    Hello! I have to design a AC to DC power supply for my power electronics class. The only requirement is that the input is 120VAC, 60Hz and the ouput is DC - it can be anything! I understand that I'll first have to start off with some sort of transformer and a full-wave rectifier and then some...
  12. M

    How to simulate noise on PSPICE (student version)

    how to simulate pspice student Hello! I would like to simulate noise of a LNA using PSPICE. My criteria to meet is 2.5dB, but PSPICE does not graph in that format. How do I simulate the Noise Figure? Thanks!
  13. M

    I need to design a two-stage comparator using only bjts.

    Thanks. That is helpful. I looked into my requirements a little more and realized that it is supposed to be designed as an op-amp.
  14. M

    I need to design a two-stage comparator using only bjts.

    Does anyone have sample schematics or any ideas on how to start this?
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