PID: Using an OP-AMP to implement a PI controller.

In this video we examine a practical PI controller using an Operational Amplifier with proportional and overall gain adjust. The Laplace transform for our circuit is fully solved showing the individual proportional and integral terms.

[botanysilkiebreeders]

This is incredible. There are so many concepts that are coming together in a 10 minute video.

[jessshoes]

Can anyone tell me where about in an electrical engineering degree this class would be? I've been self-learning this whole time, but this video for some reason has made me feel this burning desire to go back to school. Because I have been practicing all of these things without knowing any of the terms, but it all made sense as I was hearing it, and, I feel like I am further in my learning than this. Which has given me an unexpected feeling of hope.

But now I need to know, cuz maybe I really do have a knack for this. I have spent every moment of my spare time every day for about 6 months obsessed with this stuff. It all began when I was devastated by my guitar suddenly dying on me, and decided to try to fix it. Well, I fixed it. Then, my amplifier was making noise when I connected it through one of my pedals... so I learned how to make a buffer. And it has just snowballed into a complete obsession. I find the waveform to be more easy for me to visualize than actual things. I can imagine how they would be affected by things, such as filters, or by each other, or if they are summed, differential, if I made two full rectified instances of a sinusoid, and one was inverted and also 90 degrees out of phase, then they were summed...
... you get the point. I am thinking about waveforms all day, I dream of them, I wake up and make whatever I dreamt about.


...and I basically have only needed to do the math a handful of times for each type of circuit or function. Once I can "feel" a formula or, a group of dependent relationships, I can estimate with very decent accuracy.

I have experienced this in the past, but never on this level, analog circuitry feels like the scratch my itchy brain has been seeking all of my life... I can just feel it, what would satisfy the functional loop for a given circuit, especially with a scope of the input and output, I can tell right away exactly what is happening or what needs to change

I spend all day studying, simulating, and building analog effect designs. I am nowhere near sated in my hunger for understanding. I am ravenous.

God, someone please help me.

[Qaidi_]

Hi, Dr. Thanks for such a great video. I have an analog PI controller circuit through which I want to drive past the actuator but my output of the controller becomes saturated. How I could solve this problem? I am new to electronics. Also, I am not sure which output will be better for me in the end. My cut-off frequency is 2KHz. How I should analyze the output? and choose better one.

[audiokees]

This kind of circuit is used in feedback class d amps, like icepower. Id a PID not better? faster and more stable in such amps. In a PI the setup of a feedback is such that the fall off from 1 Khz to 20 or 30 Khz is such that at 30 Khz the gain is zero, sometimes in class d I see even more safisticated system with some more complicated plot where the transform as more poles and zero.s.