LTSPICE #10: Trick For Finding The Input Impedance
In this video I show a trick on how to find the input impedance of many circuits using the -3dB rule and first order filters. Note that this ofcourse may not work with all circuits. But if the circuit consists of an AC coupled signal into let's say, a transistor amp or opamp, this will most likely work.
0:00 Intro
0:16 Emitter Follower
1:49 How?
2:50 Class A Voltage Divider Amplifier
3:32 An Important Lesson
3:56 Inverting Opamp
4:32 Outro