Usually, the power adjusting is made either by manual work or through a complicated circuit system, and the latter often brings difficulties to the systematic debugging and designing.
通常功率调节功能依靠手动或采用复杂的电路系统来完成，这往往给系统的调试和设计带来困难。
2
By using the Pole-Zero as the analytical means in EWB circuit analysis, the transfer function was analysed in complicated circuit or system to replace the dull and onerous manual computation.
Through hole components welding using traditional manual welding or soldering. The circuit board surface mount components and through-hole components mixed together.