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  1. 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...
  2. foTONICS

    Anyone know how this works?

    Let you hook up to different power supplies and output a steady voltage of 120 (or whatever they use over there) but where there are lugs on the back and not a plug scares me
  3. foTONICS

    comm vs. spectrum analyzer

    You answered exactly what I was asking, basically I was just curious of what actually set these two apart. Very useful information. I (may) have an interview in a little while and was encouraged to add this to my resume. (We will be working with both of them in a couple weeks but I wanted to...
  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

    okay so i scanned in the character 'd' as a integer (%d) instead of %c, and its somewhat working, any reasoning behind this? ASCII?
  7. 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")...
  8. foTONICS

    Crystal Oscillator Circuit.

    I believe it has something to do with the high input resistance of the FET so as to not load down the crystal which can cause it to drift. i think drift is right, im still a student so be lenient.
  9. foTONICS

    Crystal Oscillator Circuit.

    as you go higher in frequency LC tuned circuits started acting funny. you can operate a crystal at much higher frequencies with a far superior stability. and above that you want overtone crystals (just a different form of crystal) which operates on a harmonic of the frequency you want but that...
  10. foTONICS

    why electroytics?

    i was super interested then just 'lol'd' at phase of moon
  11. foTONICS

    resistor tampering

    thanks a ton bob that makes perfect sense, i was thinking of the material as slowing down the conductance not enabling it
  12. foTONICS

    High voltage DC to AC

    step it down to 120 and use a tube (generate square wave) with a tank to smooth it into AC. (I believe the tube will double the voltage back up to 240)
  13. foTONICS

    Identify this capacitor

    have you checked your transistors? class C's are usually the first thing to go due to the constant slamming on and off. if your not picking anything it up it could be either what i just mentioned or maybe a tuned circuit somewhere got to old
  14. foTONICS

    double the voltage half the amps...

    stepping up the voltage through a 1:2 transformer will double your voltage and half your current
  15. foTONICS

    Differential Op amp CMRR

    i believe shorting the inputs and using an external trimpot until your output has a CMRR of 50dB is a nice way of doing it
  16. foTONICS

    Simple Question Regarding Isolating Car Batteries With Diodes

    i dont think it matters which terminal you connect the diodes to as long as they are in the right direction
  17. foTONICS

    dunk tank

    I think i would stay away from option #1, those latches look small and show knows how much weight will be pulling on them, plus the repeatable working of the mechanisms will put wear and tear on it. I would lean towards the magnet, although it would use more power it has less moving parts. so...
  18. foTONICS

    Basic Audio Transmitter/Receiver (Help!)

    although still a college student so no expert, I would say that the 'data rate' is just referring to additional digital code that can be transmitted with the audio. Like newer cars telling you which song is playing on the radio, or when a cop presses his radio and his name shows up at the...
  19. foTONICS

    Basic Audio Transmitter/Receiver (Help!)

    I would say yes these can talk to each other, just make sure you dont drop the transmitter, looks like a crystal and those are super fragile, paper thin
  20. foTONICS

    Summing difference amp outputs

    use a buffer if want to protect your cct and not draw any current from the source. and as far as summing goes, just stick each output into the input of this:
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