This circuit was proposed by a 1965 Electronic Design. Its purpose is to widen the line transients to make them easier to see on common oscilloscopes.
We found this circuit in the Linear Applications Handbook of the National Semiconductor of 1994....
This tone-modulated transmitter was found in recent English documentation. The circuit operates in the 27...
This very low current circuit was found in the April 1995 issue of Electronics Now magazine. The...