E)
This soft start dimmer was found in a Motorola documentation from 1968. However, it can be implemented with modern equivalent components like the 2N2646 for the Unijunction.
This circuit was found in a Popular Electronics from April 1993. It is a voltage regulator circuit...
This circuit was found in a 1967 US documentation. It shows how to build a gain control by digital...
This circuit was found in an American 1960s documentation. The circuit uses transistors of the...