However, since you can't buy a zero without buying a pole, there are no true differentiators. Those of you who have taken calculus can appreciate this. 2 Complex poles. Impedance increases away from resonance. 2 Complex Poles.
Impedance decreases away from resonance.
We will defer discussion of complex poles and zeros to a future article. Consider an R-C coupling mechanism from plate of one stage to grid of the next stage. For inductively coupled circuits, you must also consider the winding resistance of the inductor. It helps in analysis to scribble on the schematic a resistor in series with the inductor or transformer whose value is the winding resistance. This is probably as good a point as anywhere in this tutorial to note a common mistake associated with the cathode bypass capacitor.