When I saw this, as soon as I saw him pick up the ruler I just slapped my forehead and instantly knew this was the most obvious visual explanation
He had already posted this video to his channel ages ago and this was against my "rules" for this guest video series, but I couldn't turn down including this one.
This is the best opamp explanation I’ve ever seen.
This is the best opamp explanation I’ve ever seen.I beg to differ. Using the virtual ground method is bound to confuse people. I learned a better method and that is to say the voltage differential between inputs of an ideal opamp is 0V and the opamp sends current through the feedback network to keep it that way. When using the current you can calculate/solve any complex feedback network.
Although personally I don't know whether your good deed here will have significant impact on your subscriber counts or donations or any advantages for you.
The 'virtual ground' method is just too dumbed down to be useful for circuit design.
The 'virtual ground' method is just too dumbed down to be useful for circuit design.Rubbish. I've used the "basic rules of opamps" countless times for real circuit design. It creates a nice base model you can either use as-is if your design is not critical, or start to add on other things like offset etc.
Why the F*** did they muck about with teaching the 'virtual ground' method while there is a different simple method which always works?
That is why I wrote 'ideal opamp'. Ofcourse there is more at play here but to model basic circuits at DC levels I find the method I described much easier and more complete to use. The 'virtual ground' method is just too dumbed down to be useful for circuit design.
As I wrote before: the 'virtual ground' method is limited and I've seen people shoot themselves in the foot because of it. I certainly felt cheated when I learned the method which uses the current through the feedback network. Why the F*** did they muck about with teaching the 'virtual ground' method while there is a different simple method which always works?
As I wrote before: the 'virtual ground' method is limited and I've seen people shoot themselves in the foot because of it. I certainly felt cheated when I learned the method which uses the current through the feedback network. Why the F*** did they muck about with teaching the 'virtual ground' method while there is a different simple method which always works?And your video or blog teaching this "simple method which always works" is where?
Say the voltage differential between inputs of an ideal opamp is 0V and the opamp sends current through the feedback network to keep it that way. When using the current you can calculate/solve any complex feedback network.
Say the voltage differential between inputs of an ideal opamp is 0V and the opamp sends current through the feedback network to keep it that way. When using the current you can calculate/solve any complex feedback network.FET's are voltage, not current-controlled transistors, right? Now please explain how your "current feedback" network method works for FET input opamp in unity gain mode?
Say the voltage differential between inputs of an ideal opamp is 0V and the opamp sends current through the feedback network to keep it that way. When using the current you can calculate/solve any complex feedback network.FET's are voltage, not current-controlled transistors, right? Now please explain how your "current feedback" network method works for FET input opamp in unity gain mode?The same as it does for any opamp because there is no basic functional difference between FET or BJT opamps (ofcourse there are differences but these have to do with input bias current, input offset voltage, noise, etc). Don't mix 'current feedback' with 'current through the feedback network' because those are totally different topics.