Found in a 1967 Electronic Design, this transistorized circuit compresses and then expands a pulse. The circuit has a double adjustment and the transistors are of the time.
This circuit is from a technical documentation from the 70s, and equivalents can be used for...
This circuit was obtained in an English publication from 1980 but can still be assembled with...
This circuit was found in the July 1992 Radio Electronics magazine. Sensitivity adjustment is made...