emitter resistance การใช้

E usually is small because the emitter resistance " r"
The active transistor is loaded with the relatively high emitter resistance " R"
:Meanwhile, the purpose of the bypass capacitor around any external emitter resistance is to make that impedance low for DC signals.
:If the external emitter resistance is small or zero, then you really can't use a constant base voltage as a bias as it makes things way too sensitive to variations in R E and ?.
In the second case ( e . g . primary and / or emitter resistance dominant ) the ( decreasing ) slope of the current decreases to a point such that the induced voltage into the secondary is no longer adequate to keep the switch closed.