<transcript><audio_23>efficiency if it's capacitively coupled of only 25 percent and practically speaking it'll probably be a lot worse than that so let's dive in we'll start with a little AC equivalent circuit</transcript><transcript><audio_24>looking something like this and here's our transistor now I'm going to be as generic as possible here and draw in an emitter resistance an AC emitter</transcript><caption><image_25>The image shows a hand holding a black marker and writing on a whiteboard. The whiteboard is attached to a wooden wall and the hand is positioned in the center of the image. The hand is holding the marker in a way that it appears to be writing on the whiteboard with the marker. On the left side of the board, there is a diagram of a circuit board with various components labeled as "Class A", "Class B", and "Class C". On the right side, there are two lines of text that appear to be related to the circuit board. The text is written in black ink and is not legible.</caption><transcript><audio_26>resistance as well as an AC collector resistance now practically speaking we'll probably have either one or the other for example if we had a voltage</transcript><caption><image_27>The image shows a person's hand holding a black marker and writing on a whiteboard. The whiteboard is attached to a wooden wall and the person is writing on it with black marker. On the left side of the whiteboard, there is a diagram of a circuit diagram. The diagram is labeled "Class A" and appears to be a circuit with various components such as resistors, capacitors, transistors, and diodes. The text on the board is written in black ink and is not visible in the image.</caption><transcript><audio_28>follower which would be common for a power amplifier excuse me we'd only have the re the RC would be shorted and if we had a common emitter amplifier there would be no re if there was no swapping and even if there was swapping the re would be a lot</transcript> efficiency if it's capacitively coupled of only 25 percent and practically speaking it'll probably be a lot worse than that so let's dive in we'll start with a little AC equivalent circuit looking something like this and here's our transistor now I'm going to be as generic as possible here and draw in an emitter resistance an AC emitter resistance as well as an AC collector resistance now practically speaking we'll probably have either one or the other for example if we had a voltage follower which would be common for a power amplifier excuse me we'd only have the re the RC would be shorted and if we had a common emitter amplifier there would be no re if there was no swapping and even if there was swapping the re would be a lot
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