Search results

  1. foTONICS

    PLC simulator

    I've been searching for a useful PLC simulator so I can sketch programs at home when I'm away from school. I've tried going to Siemens and downloading their version off their site but it doesnt seem to be compatible with Vista. Does anyone know of an easy to install basic PLC simulator program...
  2. foTONICS

    Is this the 'Tip & Ring' of the telephone system?

    Hey all, I am currently a student in telecommunications. I was painting my room and hence removed all the cover plates. One of them was a telephone jack and inside it there was a red, green, yellow, and black. I'm pretty sure the red is the -48VDC and the green is ground. What are the yellow...
  3. foTONICS

    The power of Logs

    Hey all, So in my telecomm course we are talking about Shannon's law which determines the maximum BW of a cable. Usually with decibels we have been using Log to the power of 10, but this formula calls for a Log of 2. He mentioned how to convert from one to the other but it was very confusing...
  4. foTONICS

    comm vs. spectrum analyzer

    Hey all, I was just wondering what the difference between the two are (if there is one). I have worked with the comm analyzer a little bit in school. I think the comm analyzer can do everything a spectrum analyzer can right?
  5. foTONICS

    74LS95

    I been asked to hook up an 8-bit shift register with 2 74LS95's. To connect the two should I connect the output of QD on the first chip to SW1 of the second chip?
  6. foTONICS

    C- reading in a character

    Hey all, I'm working on a lab for programming and have run into a hiccup. Below is a sample of my code (edited for clarity): #include <stdio.h> #include <stdlib.h> char d; int main (void) { printf("*\t\tCharacter Arithmetic\n")...
  7. foTONICS

    resistor tampering

    so a couple years ago during my DC final a bonus question asked: If you scratch the material off of a resistor with a knife until you see bare wire, will the resistance go up or down? almost everyone answered down but the teach said the resistance would go up. can anyone explain this to me...
  8. foTONICS

    unknown formula

    Hey everyone. I have a mid-term next week and I was going through my notes and I came across this formula: k= M/√(L_1*L_2 ) I believe it has something to do with transformer coupling. L1 and L2 being the first and second transformer. I know that K is a constant, but i am having trouble...
  9. foTONICS

    class C bias question

    I was asked to calculate DC voltages VB, VE, and VC. I am a little stuck on this CLASS C design since there is no input voltage for me to work with. I'm just looking for a little guidance as where to begin. I was given no beta values. ive attached the photo below, thank you all for your...
View older results
Top