A transistor turns a tiny base current into a big collector current. Set the bias, place the Q-point on the load line, and read the voltage gain.
BJT Common-Emitter AmplifierLive
bias point & gain
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A transistor amplifies because a tiny base current controls a much larger collector current (Ic = β·Ib). The Q-point on the DC load line sets how much undistorted swing you get; too far and the transistor saturates or cuts off. Educational tool.
Reading this result: Sitting in the active region with about 4.0 V of V_CE headroom; the gain ≈ -Rc/Re ≈ -4.7×, so shrinking Re trades bias stability for more voltage gain.
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How it works
In a common-emitter amplifier the collector current is Ic = β·Ib, and the operating (Q) point sits on the DC load line Vce = Vcc − Ic(Rc+Re). Centering the Q-point maximizes undistorted swing; pushing it too far drives the transistor into saturation or cutoff. Educational tool.
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