The operational amplifier used is not common today, but the circuit can be implemented with modern operational ones. The gain is 1000 and the source must be symmetrical.
Found in American documentation from the 1970s, this circuit can be designed based on a modern SCR,...
June 2017 - A wide variety of Rohm Semiconductor audio and codecs for audio is available from...
Found in a 1964 Electronic Design, this circuit must use transistors according to the supplied...