Found in American documentation from 1969, this circuit operates in the frequency range 10 to 150 Hz providing signals as shown in the diagram itself.
Using an LF356 operational, this circuit was found in the September 1989 issue of Radio...
This circuit is from a documentation on Motorola interfacing techniques from 1975. The Darlington may be...
The integrated circuit of this project found in an American publication from the 70's is not very...