This circuit is from an old American documentation from the 70s. Transistor 2N3904 can be replaced by BC548. The relay must have 100 mA of maximum current.
This circuit is intended to increase the width of a pulse. The circuit is TTL and can be used as a...
The first circuit, shown in the figure, generates a stepped signal whose frequency depends on the...
This circuit is from a 1968 documentation using one of the first integrated circuits available at the...