Transistor amplifier is one of the most common nodes in electronics. In general, any electronic amplifier is designed to increase the power of a weak signal due to the power of the power source. The input signal is most often the resonant circuit of the receiver or microphone, and the output signal is fed either to the next similar stage, or, for example, to a speaker or other load.
The most common in the practice of novice electronics engineers was the amplifier on a bipolar transistor. Most often, a bipolar transistor is connected in a common emitter circuit. This circuit allows you to obtain the maximum gain in power, since it occurs in terms of current and voltage.
For correct operation of the AC amplification circuit, it is necessary to correctly set the operating point, that is, to adjust the operating mode of the transistor in direct current.
This video shows how in practice, a working point is set up with reference to the load straight line output of the static characteristic of the transistor. Also shown is how a low-frequency transistor amplifier works with different input voltage waveforms: sinusoidal, rectangular and triangular. Recommendations on the choice of input and output blocking capacitors are given.
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