This circuit was found in a 1967 US documentation. The FET is general purpose and the 6V zener. The circuit has a very fast switching action.
The 8038 is an integrated waveform generator (sinusoidal, triangular and rectangular) from...
The circuit is from a Radio Electronics from August 1989. The cells used at that time did not have...
This circuit is from 1992 documentation. The operational circuit, which is uncommon nowadays, can...