This diagram was found in the November 1972 issue of Radio Electronics magazine in an article describing benchtop equipment. The transistors are of the time and the frequencies are given by the coils.
This circuit was found in documentation from the 1980s. The circuit can be designed based on...
This circuit uses two operational amplifiers, which can be of the type 741, in a full wave...
Other series operational amplifiers, such as MC34072, MC34074, MC35071, MC35072, MC35074 d MC33071...