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About cyeokpeng

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  1. The admissions office at State University wants to develop a planning model for next year's entering freshman class. The university has 4500 available openings for freshmen. Tuition is $8600 for a local student, and $19200 for an overseas student. The university wants to maximize the tuition fees it receives new year. By state mandate, it can admit no more than 47% overseas students. Also, each college in the university must have at least 30% local students in its freshmen class. In order to be ranked in several national magazines, it wants the freshmen class to have an average SAT score o
  2. I am at a loss of how to write down circuit network equations when (i) a current source which cannot be clearly converted into a equivalent voltage source is included in one specific mesh. (ii) a dependent voltage source is included in one specific mesh. using the matrix equation form. For (i), the voltage across the current source is dependent on the variables of mesh currents, so it cannot be included into the voltage excitation/input matrix Vmesh. For (ii), can we treat the dependent source as a normal element like a resistor in the derivation of the impedance matrix? The
  3. I have realized the limitation of current in embedded system design of a particular application. The design is logically correct in terms of flow diagrams, but because, it drives plenty of LEDs, including the 7-segment display and a pair of dc motors, if the choice of batteries is not correct, even though the voltage input is right, the system will not work!
  4. True, in the way as YT2095 has described, you can generate electricity, but the current generated in the coil (I think in pico to microAmpere range) is too small for any use in most electrical applications. Even the least power-hungry device like the LED, I doubt it will light up.
  5. Hi, I know how to bias a BJT transistor to operate in the active region, so that the amplifier circuit can operate as a small-signal amplifier. Two methods (i) Use biasing resistors to form a self-biasing circuit. (ii) Use diode biasing, coupled with biasing resistors. Qn1 However, how do we bias the transistor circuit to act as small signal amplifier, if MOSFETs are used instead? Design of dc biasing circuit for MOSFET as an amplifier??? I read from my textbook that we need to bias the MOSFET in the saturation region, which is quite different from the BJT amplifier dc biasing
  6. Yes i agree. Start learning from the basics, the simplest, which is the Intel 8086/8088 microprocessor rich instruction set, aseembly directives, software architecture of the 8086/8088 and hardware interfacing of the RAM, ROM, timer chip, UART chip, and plenty of others. This is because, Intel's microprocesor chip is upward-compatible, so even if you write a assembly code for 8086/8088, you can run and implement it on let's say 80486 or higher processor, your Pentium 4.
  7. Hi, I am now doing a project to write a 16-bit DOS piano program to play the 12 notes in an octave, which I have completed. But this program must also be able to "talk" to another computer through null modem R2-232 connection so that the note played on the local PC is also played on the terminal PC. I have a severe problem accessing the COM1 port on the Window XP platform, due to protected rights of accessing the I/O ports in Windows NT and higher operating systems, even when I am using the 16-bit DOS emulator program NTVDM.exe. Is there any quick solution to this problem, how am I goi
  8. Most wi-fi systems that you bought from the store cannot extend tha aerial antenna, it is fixed. The only thing we consumers could do to increse signal strength and coverage is to position the antenna of the wireless accesspoint 90 degrees up!
  9. I have worked out the voltage-time relationship of the capacitor-resistor network using 1st principles. The solution is attached in the word document I have uploaded. V = v0 - v0*exp(-t/RC) for charging case. Cheers! The general solution of the de.doc
  10. Any strong reason why you use NaOH as the electrolyte, instead of CuSO4 solution or other metallic solution???
  11. Err, without moving the position of the router and the computer??? If it is at the end of the reachable radius, the only thing that you can do is to remove as much physical obstruction between the line of sight of the router and the computer. Anything metallic will block EM waves and reduce the signal strength. Also you can try locating your wireless router higher up so as to reduce any possible physical obbstruction. Another way you may try is to move a little bit of the wireless card postition to move out of any possible multipath fading phenomenon. But these two methods may not be tha
  12. What program did you use to draw that pretty diagram, Jakari?
  13. Are you assuming that the other radio is in fact already turn on? Anyway, based on what I know, it should not affect the intensity of the other radio much, even though the radio you are turning on is activated through remote control. The radio frequency that the remote control is using a frequency band that is quite far away from the spectrum of the actual radio signals from the radio station.
  14. Very Very simple radio! An antenna A few variable capacitors inductor coils resistors Make a RLC resonant circuit using these and we can tune in to the frequency you want by varying the capacitance of the variable capacitor. It works but it is a very poor quality one.
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