This is another actorial or interactive tutorial app by N. Chao. This app can help solve bias and gain for ac voltage divider common emitter amplifiers. You can enter all the circuit values and see ac waveform results with ac solution details or you can quickly vary bias resistor R2 or RE or beta up and down to see the resulting change in Q pt, and ac waveshape. Use app to quickly correct poor biasing and uneven waveform clipping.
The circuit set is flexible so you can use it for circuit with or without RL and with or without bypassed RE. The app can also include the signal source resistance Rs if needed.