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Applet Tutorial

Preparation, Orientation: [You may skip this part if you are already familiar with the buttons and components in this applet.]

  1. Maximize your Browser window (a 17" monitor should show the entire applet screen.)
  2. The top-bar in the applet has the "Schottky-clamped" checkbox, "Ckt Param" button, "BJT Param" button, and the choice for images at the lower-right part of applet screen.
  3. The bottom-bar of the applet has four buttons to control animation. Click on the "Pause" button (the third button in the bottom-bar) to suspend the animation thread. This will suspend the 'eye-disturbing' effect of animation while you are settling in.
  4. Also note that the horizontal spacing of grids in the waveform graphs is roughly 5 ns. The horizontal axes represent the elapsed time and the waveforms travel from left to right. The horizontal axes are the same in all four waveform graphs.
  5. Note that the "elapsed time=", shown in the circuit diagram in the upper-left corner of applet screen, represents the elapsed time since the last 'switching' action in the input signal voltage, Vi.
  6. The main screen view is composed of five sections:
  7. The four waveform graphs are drawn versus the elapsed time:
    1. Vi = input voltage waveform,
    2. iB = Base current waveform,
    3. Qb = total excess minority carrier charge in the Base. Here Qeos (the red horizontal line) is the excess Base charge at the edge-of-saturation (i.e., the boundary between forward-active region and saturation region of BJT, and
    4. iC = Collector current waveform.