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Recent content by chri$

  1. C

    All about the sampling

    Yes, that's right. And with the same case, the signal can be recovered from its samples. It's pity that you don't have scilab. But thanks for your reply. As I thank andre_teprom for his reply.
  2. C

    All about the sampling

    I found a demo about the sampling. It shows its process. And I have another question, the sampling process stops once the the sampling frequency is below the input frequency ? Because in the demo, the process stops twice. Here's the link. It will work if you have scilab...
  3. C

    All about the sampling

    Hi everyone, These last days, I read about the sampling theorem that use to convert a digital signal to an analog signal or conversely. So, I ask some question about this topic in order to get a more understanding of that theorem. Like, that skill use a quantizer in order to take a voltage...
  4. C

    Basic Of Mobile Communication Question :: Try To Help :: Pls

    Hi Excuse me, whet's the name of this software ? Is it free. Sorry if i don't answer at your topic.
  5. C

    make a laser pointer

    Thanks for your replies. I'll try with what I have.
  6. C

    make a laser pointer

    Hi everyone, I'm about to make a laser pointer (red laser 1mW, alimentation min 3Vdc and current <60mA). So, here's my question. Can I just put 2 resistors ( the both are 10 ohm) and potentiometer (100 ohm) ? or I should add components like diodes and voltage regulator ?
  7. C

    learn electronics on working

    150 years ?? Anyway, I will see what i can do. Thanks for your help.
  8. C

    learn electronics on working

    I try to follow this advice. Thanks. Regarding the college students. They work the weekend or after theirs courses ? And what's about the contract ?
  9. C

    learn electronics on working

    Hi everyone, I try to find a path to learn electronics on working and also escape at unemployement. Here's my situation. I have got my 2-year technical degree in network computing since July 2012 (BTS it's a french degree 2 years after the high school diploma "BAC" in France). After that, I...
  10. C

    Looking for a job in radiocommunication devices

    Hi, I look for a job. This is my job advertisement.
  11. C

    Looking for a job in radiocommunication devices

    Good morning. I live in Paris, FRANCE and at this moment i'm unemployed. So, I looking for a job in mobile phone, computing devices or two way radios repair. Meanwhile, I study troubleshooting lessons and mobile phone and two way components with documents i find on websites. I improve my...
  12. C

    help to understand simple FM walkie talkie circuit diagram

    Thanks for your reply Dave.Yes the oscillator may have two ranges. Then the mixer make 2 arithmetics. One operation 400+389.3 and 400-389.3 But we want 10,7 MHz. So, IF take the value 10,7 MHz. And about (400+389.3) is going to delete by the filter. - - - Updated - - - I agree it's A class...
  13. C

    help to understand simple FM walkie talkie circuit diagram

    In any case. Thanks to all for your replies. And If i had questions, i would pose them.
  14. C

    help to understand simple FM walkie talkie circuit diagram

    The RF oscillator is the same thing that the local oscillator ?
  15. C

    help to understand simple FM walkie talkie circuit diagram

    Don't worry. It happen. - - - Updated - - - I see. This transmitter have a FM range from 88 to 95 MHz. And this range relate to VHF range. As we can see in this link: http://image.tutorvista.com/content/communication-systems/radio-frequency-bands.gif About the audio amplifier where we find...
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