transistor voltage amplifier ac current

transistor voltage amplifier ac current

②Communication channel. In AC analysis, since the internal resistance of the AC power supply voltage source is very small, it is equivalent to a short circuit for the signal, so the AC voltage
at the Vcc terminal is ov, which is called AC ground. The AC ground and the actual ground terminal can be regarded as the same point. The emitter (e) is AC grounded through the capacitor C7.