Class A power amplifier power circuit

The two (or two groups) transistors in the output stage of a Class A power amplifier (Class A power amplifier) ​​are always in a conductive state, which means that they continue to conduct current regardless of whether there is a signal input , and make the two currents equal to the peak value of the alternating current. This When AC flows into the load under maximum signal conditions. When there is no signal, the two transistors each flow an equal amount of current, so there is no unbalanced current or voltage at the output center point, so no current is input to the speaker. When the signal tends to the positive pole, the output transistor at the top of the line allows more current to flow, while the output transistor at the bottom allows relatively less current. Because the current becomes unbalanced, it flows into the speaker and drives the speaker to produce sound.