EEVblog No Script, No Fear, All Opinion
Dave answers an exam question on OpAmps that’s interestingly tricky. Bonus opamp tutorial on biasing.
Part 2: https://www.youtube.com/watch?v=33rS0oLULqw
https://www.eevblog.com/forum/beginners/how-to-analyze-the-opamp-circuit/
OpAmp playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHu2FviAaZaiyXwN41G4b1Lf
00:00 – A tricky exam question
01:45 – What’s missing?
03:11 – The two most important Opamp rules
04:44 – THINK about what sort of exam you are in BEFORE answering the question
07:04 – Capacitive reactance “AC resistance”
08:53 – They want you to use frequency, but also IGNORE it? How does that work?
10:21 – When it doubt, assume a short circuit
10:59 – Solving the first part of the question
12:20 – The 2nd rule of AC circuit analysis
13:33 – Solving the second part of the question, what is the AC gain?
15:29 – There is no need to muck around, move on to the next question
15:58 – Let’s talk about Opamp Biasing
22:59 – Single pole high pass filter
23:31 – Ripple removal filter
26:24 – Conclusion, why is this question is clever?
Podcast: Download
