This circuit works as both an injector and a signal follower. We found it in the May 1994 issue of Electronics Now. The Z1 headphone must be high impedance.
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...