This circuit was found in ancient American documentation. Equivalent operational amplifiers can be used. The power supply must be symmetrical. The circuit provides an average output.
This source circuit was obtained in a 1976 publication for radio amateurs. The transistors can be...
This low-pass filter with 741 op and symmetrical source was found in the August 1993 issue of...
This circuit was found in a 1993 Electronics Hobbyst Handbook. The circuit operates in the FM...