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Simple NPN Signal Amp, the objective is to show the signal amplification like audio, where only frequencies are allowed to go through the capacitor and amplified on the collector of the BJT.
As we can see, there is an oscillator with 1Khz which is our input signal and a capacitor that has the function of not allowing the voltage go to the base of our transistor, allowing only the frequency passes by (yellow wave).
The circuit is powered with 12V DC, in the base of the transistor there are have two resistors creating a voltage divider between the power supply and the ground these are goint to drop voltages from the power supply and bias the base terminal with about 1V so the resistor on the emitter terminal is to drop the excess of voltage of 1V that comes from the base and allowing about 0.7 VBE to make it work in the active region.
With the signal from the oscillator and the transistor working in it active zone, the collector of the transistor is going to have the signal amplified as we can see on the (blue wave).
We have here and just for reference a gain of 51, which is calculated (Vin / Vout) = β
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