This isolation circuit for audio signals was found in the August 1992 issue of Radio Electronics magazine. The circuit can be applied to other operational amplifiers.
I found this circuit in an article in a 2003 publication. The circuit is an example of how to...
This interesting circuit of the American publication Electronics Handbook Volume XIII 1993 shows a...
This circuit is from a documentation from the 50's. The transistors are made of germanium. The...