The most commonly used transistor arrangement is the common emitter configuration. In this configuration, the emitter terminal is connected to the input signal, the collector terminal is connected to the output signal, and the base terminal is connected to a voltage source. The common emitter configuration is the most versatile of the three basic transistor configurations, and it is used in a wide variety of applications, including amplifiers, oscillators, and switches.
The common base configuration is less common than the common emitter configuration, but it is still used in some applications. In this configuration, the base terminal is connected to the input signal, the collector terminal is connected to the output signal, and the emitter terminal is connected to a voltage source. The common base configuration is used in applications where high input impedance and low output impedance are required.
The common collector configuration is the least common of the three basic transistor configurations. In this configuration, the collector terminal is connected to the input signal, the emitter terminal is connected to the output signal, and the base terminal is connected to ground. The common collector configuration is used in applications where high current gain is required.
In conclusion, the most commonly used transistor arrangement is the common emitter configuration. It is the most versatile of the three basic transistor configurations, and it is used in a wide variety of applications.