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I believe the fellow in the bjt_amps reference just wanted to illustrate the naming of these three kinds of circuits (without adding too many additional circuit elements).Averagesupernova said:Although you can have common emitter, common base, and common collector you NEVER input a signal on a collector. I have never seen it anyway, and that is what is being attempted in this circuit.
A transistor configuration on a circuit refers to the specific arrangement of transistors within a circuit. This arrangement can affect the performance and functionality of the circuit, and there are three main types of configurations: common emitter, common base, and common collector.
In a common emitter configuration, the input signal is applied to the base of the transistor, while the output is taken from the collector. In a common base configuration, the input is applied to the emitter and the output is taken from the collector. Additionally, the common emitter configuration has high voltage gain and low current gain, while the common base configuration has low voltage gain and high current gain.
In a common collector configuration, the input is applied to the base of the transistor, while the output is taken from the emitter. This configuration is also known as an emitter follower, as the output voltage follows the input voltage with a small voltage drop. It has high current gain and low voltage gain, making it useful for impedance matching and signal buffering.
The common emitter configuration is the most commonly used in amplifiers because it provides high voltage gain and can amplify both AC and DC signals. It also has good linearity and can drive low impedance loads. However, the choice of configuration ultimately depends on the specific application and desired performance.
Yes, a transistor configuration can be changed after a circuit is built, but it may require additional components or modifications to the circuit. It is important to carefully consider the desired performance and functionality of the circuit before choosing a transistor configuration, as it can be difficult to change once the circuit is built.