This circuit was found in the August 1993 Electronics Now magazine. It is for telephones used on common old-style analog lines.
This preamplifier for magnetic cartridges was found in the February 1990 issue of Radio...
We find this circuit in an American manual from the 80's. The circuit can be implemented with more...
September 2016 - It can be obtained from Mouser Electronics the new integrated circuit µCC21520...