For Engineers · BJT Amplifier
BJT Amplifier for an op-amp filter
Built for engineers using it for real design work. Go from concept to a running model in the browser, then scale to the cloud when needed. Simulate an op-amp filter live below — adjust the inputs and watch it respond, right in your browser.
BJT Common-Emitter AmplifierLive
bias point & gain
Controls
Presets
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.
Data Inspector
Collector current3.00 mA
V_CE (bias)3.99 V
Voltage gain-4.7 ×
Regionactive ✓
Governing equation
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.
Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.
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Frequently asked questions
- Is this good for engineers?
- Yes — this version of "BJT Amplifier for an op-amp filter" is framed for engineers using it for real design work. Go from concept to a running model in the browser, then scale to the cloud when needed.
- Do I need to install anything?
- No. It runs in any modern browser, free, with no account required.