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Recent content by Johnny Hu

  1. J

    Advantages of optic fibers

    And the possibility to carry on many many signals at the same time, using DWDM (Dense Wavelength Division Multiplexing). In theory, DWDM means an infinite amount of data channels (because there are infinite colors of light - wavelenghts) per fiber optic line.
  2. J

    What is quantum mechanical tunneling?

    QMT https://en.wikipedia.org/wiki/Quantum_tunneling
  3. J

    Advantages of optic fibers

    As for the optical fibers transmission mode, there are multimode and monomode ones. The monomode ones are better for long-distance connections than de multimode ones. The main reason for this is that the multimode ones implies in worst signal/noise relation than de monomode ones.
  4. J

    Using ohmmeter to measure diode resistance

    Re: diode resistance Whenever you measure an out-of-circuit-diode with the multimeter in the diode-measure-mode, the value obtained is the actual voltage drop across the diode (Volts), not the resistance (Ω).
  5. J

    +3Vdc and 2mA to +12Vdc and 2A

    As for continuous drive, as commented, it is impossible. Neverthless is possible to have one single pulse of high power (non-continuous mode). If you want a single pulse of high-energy, all you have to do is to pump a hug capacitor for time enough. The energy stored can be used to generate...
  6. J

    30 pts. for HELP ( Final Day of Project)

    Izua shows the way. About the details: How much power do you need?
  7. J

    How much will be the current

    Hello everybody, this is my first participation here, i hope to learn from you and help with my little skills. About the calculation above, since the efficiency of any conversor is never 100%, you actually will need more input power than that, say some 12% or more (It depends on the tecnology...

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