We found this circuit in an Electronic Design from 1965. The 4-layer diode is an unusual component these days and can be used in its place with a diac.
This circuit was found in Ferranti's 1974 transistor manual. The circuit is for non-critical...
This simple circuit for headphones or small speakers was found in documentation from the 90s. The...
In the figure we have the conventional configuration of a differential amplifier with the...