Sinking数字输出通过三极管来控制连接线上的电平为高电平(+V)或是低电平(0 V)。
The sinking digital output controls the line by using a transistor to leave the line high (at + v) or to ground the line to 0 v.
Sourcing数字输出通过三极管控制连接线上的高低电平。
The digital output controls the line by using a transistor to leave the line at 0 V or to raise the line to +V.
准确、通俗地传递关于三极管输出特性曲线的科学含义，方便教学，是本文的初衷。
Accurately express the scientific meaning of the saturated area of the triode transistor characteristic curve in teaching is the original purpose of this paper.
三极管的信号输出端亦可接到行输出变压器的初级。
The signal output end of the triode can also be connected to the primary of the horizontal output transformer.
说明：由单片机的P1.0口输出音频信号，在P1.0口接三极管以驱动喇叭，最好用两个三极管构成达林顿结构。
Note: P1.0 port by the MCU output audio signal, the P1.0 port access transistor to drive the speakers, the best form with two Darlington transistor structure.
说明：由单片机的P1.0口输出音频信号，在P1.0口接三极管以驱动喇叭，最好用两个三极管构成达林顿结构。
Note: P1.0 port by the MCU output audio signal, the P1.0 port access transistor to drive the speakers, the best form with two Darlington transistor structure.
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