Crescendo - first module in the audio XL range

12-30 — elektor december 1982 crescendo first module in the audio XL range crescendo Power MOSFETs are available as P-channel and N-channel types. This makes it possible to design a class B amplifier in which both types operate with "time sharing" — to borrow a term from the computer field. Since there are limits to the power rating of such a MOSFET, we have used what could be described as double "job sharing" in this design: an output stage with two N-channel and two P-channel MOSFETs. The result is an output stage capable of great output power and exhibiting extremely low distortion. The principle If one takes a passport photograph and folds it downwards in the middle, over the nose and between the eyes, the two halves will certainly not be identical. The same applies to many amplifier designs. In our case, of course, we are less interested in the visual distortion than in the harmonic and non-harmonic distortion as a result of non-symmetrical amplifier design. These types o...