EXCELLENT PRESENTATION!SO ARE TAKING THE K VALUE AND,MULTIPLING BY Rf TO GET THE VALUE YOU NEED FOR THE Rf OF THE NONINVERTING AMPLIFIER?I BOUGHT YOUR LINEAR OA BOOK FOR A REFERENCE SOURCE?
A diff amp is intended as an input circuit. That's entirely different from a differential drive for the load (AKA bridged output). In any event, it is easy enough to make capacitorless final power amp stages. See my class B power amp videos for examples (or my Semiconductor Devices text).
The op amp based diff amp is a functional equivalent of the usual dual transistor version, and generally offers higher performance (depending on the op amp used). A three op amp instrumentation amplifier would be the next step up.
cool thank you!
Interesting. I can see the attraction of very high input impedance amplifiers.
EXCELLENT PRESENTATION!SO ARE TAKING THE K VALUE AND,MULTIPLING BY Rf TO GET THE VALUE YOU NEED FOR THE Rf OF THE NONINVERTING AMPLIFIER?I BOUGHT YOUR LINEAR OA BOOK FOR A REFERENCE SOURCE?
I use K to show how the R values are derived. Decide on required values of Rf and Ri based on Av, then set R'f=Rf and R'i=Ri. Done!
CAN DIFFERENTIAL AMPLIFIERS BE USED INSTEAD OF COUPLING CAPACITORS AT THE OUTPUT OF A AUDIO AMPLIFIER?
A diff amp is intended as an input circuit. That's entirely different from a differential drive for the load (AKA bridged output). In any event, it is easy enough to make capacitorless final power amp stages. See my class B power amp videos for examples (or my Semiconductor Devices text).
can you replace the op amp with the transistor version for this diff amp?
The op amp based diff amp is a functional equivalent of the usual dual transistor version, and generally offers higher performance (depending on the op amp used). A three op amp instrumentation amplifier would be the next step up.